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The use of Piled Raft Foundations Systems (PRFS) has been extended to different types of soils, including soft clay soils. In this type of soil it is possible that, in addition to the consolidation process due to the presence of loads, a subsidence process is generated, associated with variations in pore pressure with depth. In many cases, these variations are associated with the loss of recharge of the aquifers or with the extraction of water from deep soil layers. In this work, the behaviour of some PRFS built on soft clay soils, which are subjected to the double consolidation process, are evaluated, both by loading and by the extraction of water from deep soil layers. The research is based on the implementation of reduced-scale models in a geotechnical centrifuge; the influence of the separation and number of piles on the deformation or settlement of the system is analysed. It is shown that, normally, groups of piles with greater separation control settlement more effectively. However, the settlements are greater when the soil is subjected to the weight of the structure in addition to a process of depletion of the pore pressure, because the settlement depends on the distribution of the piles, which is described using the Filling Factor (FF).
Edgar Rodríguez Rincon; Bernardo Caicedo Hormaza; Juan Felix Rodríguez Rebolledo. Comparative analysis of Piled Raft Foundation System (PRFS) settlements placed on soft soils via geotechnical centrifuge. Soils and Rocks 2021, 44, 1 -12.
AMA StyleEdgar Rodríguez Rincon, Bernardo Caicedo Hormaza, Juan Felix Rodríguez Rebolledo. Comparative analysis of Piled Raft Foundation System (PRFS) settlements placed on soft soils via geotechnical centrifuge. Soils and Rocks. 2021; 44 (2):1-12.
Chicago/Turabian StyleEdgar Rodríguez Rincon; Bernardo Caicedo Hormaza; Juan Felix Rodríguez Rebolledo. 2021. "Comparative analysis of Piled Raft Foundation System (PRFS) settlements placed on soft soils via geotechnical centrifuge." Soils and Rocks 44, no. 2: 1-12.
Interception by vegetation is one of the main variables controlling hydrological and geo-environmental problems such as erosion, landslides and floods. Interception, along with precipitation and evapotranspiration, is required for the modeling of infiltration, percolation and runoff. Unfortunately, the measurement of interception in the field is time consuming, burdensome and subject to testing parameters with relatively high variability. In this context, experiments using rainfall simulators (RSs) have the potential to provide an alternative approach that addresses most of the limitations of field experiments. This paper presents a new approach to evaluate interception that combines a RS and the monitoring of the wetting front using pore-water pressure instrumentation at specific locations of the specimen. Two specimens are required, one with and another without vegetation. The proposed approach was applied to Paspalum notatum (bahiagrass) and a tropical soil. The results indicated an average interception of 5.1 mm of the simulated rainfall for a slope at 15 degrees, rainfall intensity of 86 mm h−1, and duration of 60 min. Furthermore, the vegetation decreased the surface runoff that contributes to erosion. The proposed method will enable studies on the interception mechanisms and the various involved variables, with benefits to the modeling of soil-vegetation-atmosphere interaction.
Thiago Mendes; Roberto Alves; Gilson Gitirana; Sávio Pereira; Juan Rebolledo; Marta da Luz. Evaluation of Rainfall Interception by Vegetation Using a Rainfall Simulator. Sustainability 2021, 13, 5082 .
AMA StyleThiago Mendes, Roberto Alves, Gilson Gitirana, Sávio Pereira, Juan Rebolledo, Marta da Luz. Evaluation of Rainfall Interception by Vegetation Using a Rainfall Simulator. Sustainability. 2021; 13 (9):5082.
Chicago/Turabian StyleThiago Mendes; Roberto Alves; Gilson Gitirana; Sávio Pereira; Juan Rebolledo; Marta da Luz. 2021. "Evaluation of Rainfall Interception by Vegetation Using a Rainfall Simulator." Sustainability 13, no. 9: 5082.
Pressure and suction plate tests are among the most common techniques for determining the soil–water characteristic curve. The required testing period depends on many parameters and equilibrium times may vary from a few minutes to several weeks. This paper presents a numerical evaluation of the equilibrium process, considering the influence of soil type, equipment specifications, the use of thin high air-entry value (HAEV) membranes, and the employment of the interrupted outflow method (IOM). A fully coupled numerical model was developed and verified for the analysis of the conservation and flow of water and air in the specimen-HAEV interface system. Verification and sensitivity analyses showed, however, that the suction and pressure plate tests may be adequately represented using a simplified decoupled version of the full model. The results of the sensitivity analysis showed not only the role of the HAEV interface characteristics, but also the effect of soil type, suction value, suction step magnitude, and the suction path. It was found that the IOM offers greater control over testing times, but may cause undesirable suction reversals within the specimen. Finally, a simple method is presented to estimate the equilibrium times using basic testing parameters.
E. F. Vaz; G. F. N. Gitirana; T. A. Mendes; J. F. R. Rebolledo. On the equilibrium of suction and pressure plate tests. Acta Geotechnica 2021, 1 -18.
AMA StyleE. F. Vaz, G. F. N. Gitirana, T. A. Mendes, J. F. R. Rebolledo. On the equilibrium of suction and pressure plate tests. Acta Geotechnica. 2021; ():1-18.
Chicago/Turabian StyleE. F. Vaz; G. F. N. Gitirana; T. A. Mendes; J. F. R. Rebolledo. 2021. "On the equilibrium of suction and pressure plate tests." Acta Geotechnica , no. : 1-18.
Laboratory apparatuses for the analysis of infiltration and runoff enable studies under controlled environments and at reduced costs. Unfortunately, the design and construction of such systems are complex and face difficulties associated with the scale factor. This paper presents the design, construction, and evaluation of a portable rainfall and runoff simulator. The apparatus allows the evaluation of unsaturated soils with and without vegetation cover, under a wide range of simulation scenarios. The apparatus also enables the control of the intensity, size, and uniformity of simulated raindrops for variable surface slope, specimen thickness, and length conditions. The monitoring of the volumetric water content and matric suction and a rigorous computation of water balance are ensured. The obtained results indicate that the automated rainfall generator produces raindrops with Christiansen uniformity coefficients higher than 70%, and with an adequate distribution of raindrop sizes under a range of rainfall intensities between 86.0 and 220.0 mm h−1. The ideal rainfall generator conditions were established for a relatively small area equal to or lower than 1.0 m2 and considering rainfall events with return periods of 10 to 100 years.
Thiago Mendes; Sávio Pereira; Juan Rebolledo; Gilson Gitirana; Maria Melo; Marta Luz. Development of a Rainfall and Runoff Simulator for Performing Hydrological and Geotechnical Tests. Sustainability 2021, 13, 3060 .
AMA StyleThiago Mendes, Sávio Pereira, Juan Rebolledo, Gilson Gitirana, Maria Melo, Marta Luz. Development of a Rainfall and Runoff Simulator for Performing Hydrological and Geotechnical Tests. Sustainability. 2021; 13 (6):3060.
Chicago/Turabian StyleThiago Mendes; Sávio Pereira; Juan Rebolledo; Gilson Gitirana; Maria Melo; Marta Luz. 2021. "Development of a Rainfall and Runoff Simulator for Performing Hydrological and Geotechnical Tests." Sustainability 13, no. 6: 3060.
This paper presents a simple method to apply the Ménard Pressuremeter Test (PMT) results for the calibration of the soil stiffness due to primary deviatoric loading used in the Hardening Soil (HS) Model. A hyperbolic extension is used to rebuild the PMT pressure-expansion curve at small-strain values. The method was applied to simulate a series of PMT tests using axisymmetric finite element analysis (FEA) and was compared with the conventional HS model calibration using consolidated drained triaxial tests with reasonable accordance. Finally, the method was used in axisymmetric FEA of two static load tests in instrumented piles, performed in different sites. The results indicate good agreement between predicted and measured values of pile load-settlement behavior, average shear stresses at pile shaft and pile base pressure considering usual pile working loads. For highly mobilized piles, the numerical simulations indicated that an increase in soil cohesion was able to match the predictions of pile failure, in order to consider in a simplified way the effects of soil suction and pile execution procedure, which were not simulated herein.
Heitor Cardoso Bernardes; Maurício Martines Sales; Romulo Rodrigues Machado; Aleones José da Cruz Junior; Renato Pinto da Cunha; Renato Resende Angelim; Juan Félix Rodríguez Rebolledo. Coupling hardening soil model and Ménard pressuremeter tests to predict pile behavior. European Journal of Environmental and Civil Engineering 2021, 1 -20.
AMA StyleHeitor Cardoso Bernardes, Maurício Martines Sales, Romulo Rodrigues Machado, Aleones José da Cruz Junior, Renato Pinto da Cunha, Renato Resende Angelim, Juan Félix Rodríguez Rebolledo. Coupling hardening soil model and Ménard pressuremeter tests to predict pile behavior. European Journal of Environmental and Civil Engineering. 2021; ():1-20.
Chicago/Turabian StyleHeitor Cardoso Bernardes; Maurício Martines Sales; Romulo Rodrigues Machado; Aleones José da Cruz Junior; Renato Pinto da Cunha; Renato Resende Angelim; Juan Félix Rodríguez Rebolledo. 2021. "Coupling hardening soil model and Ménard pressuremeter tests to predict pile behavior." European Journal of Environmental and Civil Engineering , no. : 1-20.
Landslides can substantially impact the fluvial systems, which is why the continuous mapping of their extent, evolution and stability assessment is crucial. However, in such environments, material identification (e.g. colluvium) and subsurface characterization by the methods used for geologic mapping and geotechnical investigation is often a challenging task. Thus, these classical invasive methods may benefit from geophysical techniques to enable and enhance our understanding of the subsurface in these areas. To examine such integrated approach, Multi-Channel Analysis of Surface Waves (MASW) combined with Electrical Resistivity Tomography (ERT) were applied on a geomorphologically active fluvial valley in Sobradinho (the Federal District of Brazil). The subsurface materials showed a specific range of resistivity values as dry soil, saprolite, and landslide slip surface. The 1D shear wave velocity (Vs) model showed an increasing trend of Vs with depth at a location away from the landslide mass, while the longitudinal profile (over the landslide) showed an anomalous change in Vs (~ 250 to 400 m/sec). Based on the existing information about the landslide, the ERT appeared to be an effective method over MASW. This study shows how the integration of geophysical data with the geological and geotechnical investigation helps to obtain a more realistic or unambiguous model of the subsurface.
Yawar Hussain; Omar Hamza; Martín Cárdenas-Soto; Welitom Rodrigues Borges; Jie Dou; Juan Félix Rodriguez Rebolledo; Renato Luiz Prado. Characterization of Sobradinho landslide in fluvial valley using MASW and ERT methods. REM - International Engineering Journal 2020, 73, 487 -497.
AMA StyleYawar Hussain, Omar Hamza, Martín Cárdenas-Soto, Welitom Rodrigues Borges, Jie Dou, Juan Félix Rodriguez Rebolledo, Renato Luiz Prado. Characterization of Sobradinho landslide in fluvial valley using MASW and ERT methods. REM - International Engineering Journal. 2020; 73 (4):487-497.
Chicago/Turabian StyleYawar Hussain; Omar Hamza; Martín Cárdenas-Soto; Welitom Rodrigues Borges; Jie Dou; Juan Félix Rodriguez Rebolledo; Renato Luiz Prado. 2020. "Characterization of Sobradinho landslide in fluvial valley using MASW and ERT methods." REM - International Engineering Journal 73, no. 4: 487-497.
Rainfall-induced landslides pose a significant risk to communities and infrastructures. To improve the prediction of such events, it is imperative to adequately investigate the rainfall-dependent dynamics (leading to fluidization) and any associated internal sliding along shear planes within clayey slopes. Therefore, the present study adopted ambient noise analysis based on the Horizontal to Vertical Spectral Ratio (HVSR) method, to measure the seasonal variation of Rayleigh wave ellipticity as an indicator for the internal deformation and transition in the material state. The methodology was applied to an existing landslide, where variations in soil stiffness and internal sliding were expected to occur in response to rainfall. To improve the interpretation of the HVSR results (and hence the prediction of landslide’ reactivation by rainfall), HVSR measurements were also conducted on a field-scale pile load test. The pile test allowed a comparison of the seismic data generated by the soil movement along shear planes. The HVSR curves of this field test showed two frequency peaks with no changes in the resonance. In comparison with the data obtained from the landslide, the resultant HVSR curves showed three frequency patterns: ubiquitous (2Hz), landslide (4-8Hz), and flat (no peak). However, the HVSR curves did not show any response to the expected seasonally induced variations in the landslide mass because of the relatively short data acquisition. Nevertheless, time-lapse HVSR is a promising technique that can complement other geophysical methods for improving landslide monitoring.
Yawar Hussain; Martin Cardenas-Soto; César Moreira; Juan Félix Rodríguez Rebolledo; Omar Hamza; Renato Prado; Hernan Martinez-Carvajal; Jie Dou. Variation in Rayleigh wave ellipticity as a possible indicator of earthflow mobility: a case study of Sobradinho landslide compared with pile load testing. Earth Sciences Research Journal 2020, 24, 141 -151.
AMA StyleYawar Hussain, Martin Cardenas-Soto, César Moreira, Juan Félix Rodríguez Rebolledo, Omar Hamza, Renato Prado, Hernan Martinez-Carvajal, Jie Dou. Variation in Rayleigh wave ellipticity as a possible indicator of earthflow mobility: a case study of Sobradinho landslide compared with pile load testing. Earth Sciences Research Journal. 2020; 24 (2):141-151.
Chicago/Turabian StyleYawar Hussain; Martin Cardenas-Soto; César Moreira; Juan Félix Rodríguez Rebolledo; Omar Hamza; Renato Prado; Hernan Martinez-Carvajal; Jie Dou. 2020. "Variation in Rayleigh wave ellipticity as a possible indicator of earthflow mobility: a case study of Sobradinho landslide compared with pile load testing." Earth Sciences Research Journal 24, no. 2: 141-151.
Runoff apparatuses (RA) are developed to study infiltration, runoff generation, and erosion processes. Several RA designs are available, but limited attention has been given to the effects of the equipment scale, initial, and boundary conditions on measured runoff. This paper presents a model-based evaluation of RAs using a finite element solution for Richard’s equation and a novel ground surface boundary condition designed to accommodate unsaturated soil behavior. The hydraulic properties of two tropical soils were considered, with multiple combinations of initial water contents, specimen dimensions, and sloping angle. The numerical exercises indicate that soils with lower air-entry values require an equilibrium stage for the establishment of initial conditions. Testing protocols with equilibrium times of 48 hours are recommended. Moisture flow produced by gravity when sloping the specimen was shown to potentially affect surface conditions and, consequently, runoff. Testing specifications to minimize the effects of specimen sloping are presented. The runoff mechanism in an RA was shown to have up to three stages, all with clear physical meaning. The third stage is an undesirable consequence of the influence of the RA’s impervious bottom. The establishment of the minimum specimen thickness that prevents boundary effects was shown to have major importance to testing results.
Thiago Augusto Mendes; Gilson De Farias Neves Gitirana Jr.; Juan Félix Rodriguez Rebolledo; Emílio Farias Vaz; Marta Pereira da Luz. Numerical evaluation of laboratory apparatuses for the study of infiltration and runoff. RBRH 2020, 25, 1 .
AMA StyleThiago Augusto Mendes, Gilson De Farias Neves Gitirana Jr., Juan Félix Rodriguez Rebolledo, Emílio Farias Vaz, Marta Pereira da Luz. Numerical evaluation of laboratory apparatuses for the study of infiltration and runoff. RBRH. 2020; 25 ():1.
Chicago/Turabian StyleThiago Augusto Mendes; Gilson De Farias Neves Gitirana Jr.; Juan Félix Rodriguez Rebolledo; Emílio Farias Vaz; Marta Pereira da Luz. 2020. "Numerical evaluation of laboratory apparatuses for the study of infiltration and runoff." RBRH 25, no. : 1.
Juan Félix Rodríguez Rebolledo; Raimundo Francisco Pérez León; José Camapum De Carvalho. Performance Evaluation of Rigid Inclusion Foundations in the Reduction of Settlements. Soils and Rocks 2019, 42, 265 -279.
AMA StyleJuan Félix Rodríguez Rebolledo, Raimundo Francisco Pérez León, José Camapum De Carvalho. Performance Evaluation of Rigid Inclusion Foundations in the Reduction of Settlements. Soils and Rocks. 2019; 42 (3):265-279.
Chicago/Turabian StyleJuan Félix Rodríguez Rebolledo; Raimundo Francisco Pérez León; José Camapum De Carvalho. 2019. "Performance Evaluation of Rigid Inclusion Foundations in the Reduction of Settlements." Soils and Rocks 42, no. 3: 265-279.
Geophysical methods have a varying degree of potential for detailed characterization of landslides and their dynamics. In this study, the application of four well-established seismic-based geophysical techniques, namely Ambient Noise Interferometry (ANI), Horizontal to Vertical Spectral Ratio (HVSR), Multi-Channel Analysis of Surface Waves (MASW) and Nanoseismic Monitoring (NM), were considered to examine their suitability for landslide characterization and monitoring the effect of seasonal variation on slope mass. Furthermore, other methods such as Ground Penetrating Radar (GPR) and DC Resistivity through Electrical Resistivity Tomography (ERT) were also used for comparison purpose. The advantages and limitations of these multiple techniques were exemplified by a case study conducted on Sobradinho landslide in Brazil. The study revealed that the geophysical characterization of the landslide using traditional techniques (i.e., GPR, ERT and MASW) were successful in (i) the differentiation between landslide debris and other Quaternary deposits, and (ii) the delineation of the landslide sliding surface. However, the innovative seismic based techniques, particularly ambient noise based (HVSR and ANI) and emitted seismic based (NM), were not very effective for the dynamic monitoring of landslide, which might be attributed to the short-time duration of the data acquisition campaigns. The HVSR was also unsuccessful in landslide site characterization i.e., identification of geometry and sliding surface. In particular, there was no clear evidence of the light seasonal variations, which could have been potentially detected from the physical parameters during the (short-time) ambient noise and microseismic acquisition campaigns. Nevertheless, the experienced integration of these geophysical techniques may provide a promising tool for future applications.
Yawar Hussain; Martin Cardenas-Soto; Salvatore Martino; Cesar Moreira; Welitom Borges; Omar Hamza; Renato Prado; Rogerio Uagoda; Juan Rodríguez-Rebolledo; Rafael Cerqueira Silva; Hernan Martinez-Carvajal. Multiple Geophysical Techniques for Investigation and Monitoring of Sobradinho Landslide, Brazil. Sustainability 2019, 11, 6672 .
AMA StyleYawar Hussain, Martin Cardenas-Soto, Salvatore Martino, Cesar Moreira, Welitom Borges, Omar Hamza, Renato Prado, Rogerio Uagoda, Juan Rodríguez-Rebolledo, Rafael Cerqueira Silva, Hernan Martinez-Carvajal. Multiple Geophysical Techniques for Investigation and Monitoring of Sobradinho Landslide, Brazil. Sustainability. 2019; 11 (23):6672.
Chicago/Turabian StyleYawar Hussain; Martin Cardenas-Soto; Salvatore Martino; Cesar Moreira; Welitom Borges; Omar Hamza; Renato Prado; Rogerio Uagoda; Juan Rodríguez-Rebolledo; Rafael Cerqueira Silva; Hernan Martinez-Carvajal. 2019. "Multiple Geophysical Techniques for Investigation and Monitoring of Sobradinho Landslide, Brazil." Sustainability 11, no. 23: 6672.
Actualmente, la ciudad de Goiânia no tiene un monitoreo sobre la calidad del agua, en especial, de los lagos existentes en los parques públicos urbanos (PPUs), lo que dificulta los planes de mantenimiento, reutilización y manejo de estos PPUs. En el presente trabajo se analizaron los resultados de la evaluación de la calidad de las aguas de los PPUs de la ciudad de Goiânia - GO, a partir de los parámetros físico-químicos (Demanda Bioquímica de Oxígeno - DBO5,20ºC Demanda Químico de Oxígeno - DQO, Oxígeno disuelto - OD , Potencial de hidrógeno - pH, temperatura del agua y ambiente, color aparente, turbidez, sólidos disueltos totales, fósforo total y nitrógeno) para en el futuro subsidiar la administración de los recursos hídricos, además de posibilitar el diagnóstico, en especial, de la calidad del agua de los lagos de los PPUs a lo largo del tiempo. Los análisis permitieron identificar la calidad del agua de los PPU's analizados presentando de forma general las siguientes franjas medias de: pH (6.4 a 9.5), turbidez (0.6 A 69.9 NTU), fósforo (0 a 0.18 mg L-1), DBO5,20ºC (0.3 a 39.9 mg L-1), DQO (0 a 1.1 mg L-1), color aparente (7.5 a 350 Pt/Co), sólidos totales (2.9 a 444 mg L-1), OD (0.8 a 35.7 mg L-1) y la temperatura (18 a 36.2 ºC), atendiendo lo establecido en las resoluciones CONAMA 357/2005 y CONAMA 430/2011, con excepciones del OD y DBO5,20ºC que en ciertos puntos de recolección obtuvieron valores que no atienden al límite legal establecido.
Thiago Augusto Mendes; Rafaela Felipe Silva; Rafael Mendes Nunes; Ítalo Costa Silveira; Lana Lima Borba; Gilson De Farias Neves Gitirana Júnior; Juan Félix Rodriguez Rebolledo; Sávio Aparecido Dos Santos Pereira. Monitoreo de la Calidad del Agua de los Lagos Artificiales y Naturales de los Parques Públicos Urbanos de la Ciudad de Goiânia - GO. Ciência e Natura 2019, 41, e58 .
AMA StyleThiago Augusto Mendes, Rafaela Felipe Silva, Rafael Mendes Nunes, Ítalo Costa Silveira, Lana Lima Borba, Gilson De Farias Neves Gitirana Júnior, Juan Félix Rodriguez Rebolledo, Sávio Aparecido Dos Santos Pereira. Monitoreo de la Calidad del Agua de los Lagos Artificiales y Naturales de los Parques Públicos Urbanos de la Ciudad de Goiânia - GO. Ciência e Natura. 2019; 41 ():e58.
Chicago/Turabian StyleThiago Augusto Mendes; Rafaela Felipe Silva; Rafael Mendes Nunes; Ítalo Costa Silveira; Lana Lima Borba; Gilson De Farias Neves Gitirana Júnior; Juan Félix Rodriguez Rebolledo; Sávio Aparecido Dos Santos Pereira. 2019. "Monitoreo de la Calidad del Agua de los Lagos Artificiales y Naturales de los Parques Públicos Urbanos de la Ciudad de Goiânia - GO." Ciência e Natura 41, no. : e58.
The behaviour of natural and reconstituted clay samples from the Basin of Mexico under uniaxial stress and strain conditions is compared. Samples from two sites in the former lake zone were reconstituted following a procedure facilitating a comparison of the obtained experimental results with those of other researchers from tests on northern European sedimentary clays and on clays from the city of Bogotá and the Campeche Sound in the Gulf of Mexico. The differences in the behaviour of natural and reconstituted materials with a wide range of plasticities is analysed, while referring to sedimentation compression lines (SCLs), oedometric compressibility curves, and intrinsic compression lines (ICLs). ICLs for the Mexico Basin clays plot above SCLs in the void ratio versus effective stress space, which reflects the influence of sedimentation conditions on the formation of more compact, less open structures in natural clays. New analytical expressions that relate intrinsic void ratios and intrinsic compressibility with index properties are presented and is demonstrated that the normalised ICL is unique for all of the clays considered herein. It is concluded that reconstituted materials are less sensitive and less fragile (more ductile) than natural soils.
Efrain Ovando Shelley; Juan Félix Rodríguez Rebolledo; Yuri Vladimiro Valderrama Atayupanqui. Geotechnical Characteristics of Natural and Reconstituted Lacustrine Mexico City Clays. Geotechnical and Geological Engineering 2019, 38, 1471 -1484.
AMA StyleEfrain Ovando Shelley, Juan Félix Rodríguez Rebolledo, Yuri Vladimiro Valderrama Atayupanqui. Geotechnical Characteristics of Natural and Reconstituted Lacustrine Mexico City Clays. Geotechnical and Geological Engineering. 2019; 38 (2):1471-1484.
Chicago/Turabian StyleEfrain Ovando Shelley; Juan Félix Rodríguez Rebolledo; Yuri Vladimiro Valderrama Atayupanqui. 2019. "Geotechnical Characteristics of Natural and Reconstituted Lacustrine Mexico City Clays." Geotechnical and Geological Engineering 38, no. 2: 1471-1484.
Reactivation of a landslide is usually accompanied by microseismic signals emitted from the deforming soil mass. The reproduction of similar signals in a physical model test conducted under control conditions can allow researchers to explore and test such complicated signals to improve the prediction of full-scale failure. The present study investigates the similarity between the slidequakes (microseismicity) naturally emitted from an existing colluvial landslide (Sobradinho, Brazil) in response to rainfalls and the emissions generated by a pullout test of an expander body (EB) pile in tropical soil under controlled conditions. The microseismic signals emitted from both experimental sites (i.e. the landslide and the EB pile test) were recorded and compared. Data were acquired by mini-arrays of four short-period seismometers. For the signal nomenclature, a typological scheme was adopted, in which sonograms/spectral contents of the signals were used. As a result, short duration microseismic signals were observed during the pullout test. In contrast, at the Sobradinho landslide, the testing detected signals of different characteristics whose source mechanisms have remained ambiguous, mainly because of the short duration of the data campaigns. However, at the landslide, propagating events were observed that might be attributed to the energies generated by the river bedload during the heavy rains. The present study offers some insight into the pre-collapse dynamic behavior of unstable slopes in clayey formations.
Yawar Hussain; Sehar M. Hussain; Salvatore Martino; Martin Cardenas-Soto; Omar Hamza; Juan F. Rodriguez-Rebolledo; Rogério Uagoda; Hernan Martinez-Carvajal. Typological analysis of slidequakes emitted from landslides: experiments on an expander body pile and Sobradinho landslide (Brasilia, Brazil). REM - International Engineering Journal 2019, 72, 453 -460.
AMA StyleYawar Hussain, Sehar M. Hussain, Salvatore Martino, Martin Cardenas-Soto, Omar Hamza, Juan F. Rodriguez-Rebolledo, Rogério Uagoda, Hernan Martinez-Carvajal. Typological analysis of slidequakes emitted from landslides: experiments on an expander body pile and Sobradinho landslide (Brasilia, Brazil). REM - International Engineering Journal. 2019; 72 (3):453-460.
Chicago/Turabian StyleYawar Hussain; Sehar M. Hussain; Salvatore Martino; Martin Cardenas-Soto; Omar Hamza; Juan F. Rodriguez-Rebolledo; Rogério Uagoda; Hernan Martinez-Carvajal. 2019. "Typological analysis of slidequakes emitted from landslides: experiments on an expander body pile and Sobradinho landslide (Brasilia, Brazil)." REM - International Engineering Journal 72, no. 3: 453-460.
Juan Félix Rodríguez Rebolledo; Raimundo Francisco Pérez León; José Camapum De Carvalho. Obtaining the Mechanical Parameters for the Hardening Soil Model of Tropical Soils in the City of Brasília. Soils and Rocks 2019, 42, 61 -74.
AMA StyleJuan Félix Rodríguez Rebolledo, Raimundo Francisco Pérez León, José Camapum De Carvalho. Obtaining the Mechanical Parameters for the Hardening Soil Model of Tropical Soils in the City of Brasília. Soils and Rocks. 2019; 42 (1):61-74.
Chicago/Turabian StyleJuan Félix Rodríguez Rebolledo; Raimundo Francisco Pérez León; José Camapum De Carvalho. 2019. "Obtaining the Mechanical Parameters for the Hardening Soil Model of Tropical Soils in the City of Brasília." Soils and Rocks 42, no. 1: 61-74.
In this paper, a simplified analytical model for the design of friction piles foundations in an environment that is prone to regional subsidence is presented. The model is based on Mindlin's equations and was originally proposed by Reséndiz and Auvinet. Some important modifications of the original version based on the results obtained from numeric analyses have been introduced. In this new version, negative skin friction is evaluated taking into consideration initial and future effective stresses conditions and not only the limit shear strength of the soil in contact with the pile system. The model was validated with results previously obtained by the authors using the Axisymmetric Finite Element Method. In spite of the differences observed during such validation, it was possible to conclude that a reasonably good match exists between both models.
Juan Félix Rodríguez Rebolledo; Gabriel Auvinet Guichard. Analytical model for friction piles in consolidating soft soils. Ingeniare. Revista chilena de ingeniería 2019, 27, 295 -303.
AMA StyleJuan Félix Rodríguez Rebolledo, Gabriel Auvinet Guichard. Analytical model for friction piles in consolidating soft soils. Ingeniare. Revista chilena de ingeniería. 2019; 27 (2):295-303.
Chicago/Turabian StyleJuan Félix Rodríguez Rebolledo; Gabriel Auvinet Guichard. 2019. "Analytical model for friction piles in consolidating soft soils." Ingeniare. Revista chilena de ingeniería 27, no. 2: 295-303.
The application of geophysical monitoring technologies may offer an opportunity to understand the dynamic of slopes in response to factors triggering their instability. In this study, Ambient Noise Interferometry was used as a monitoring approach on a man-made reduced-scale vertical slope and on a natural-scale landslide in Sobradinho (Brazil), under the influence of mechanical stress and rainfall, respectively. For both experiments, we adopted similar data acquisition system and processing workflow. After preprocessing of ambient seismic noise, the time-lapse changes were determined in terms of relative velocity changes using the moving window cross spectral technique. For the vertical slope, terrestrial laser scanning was also performed to detect crack or fissure generation. The prototype experiment results showed a decreasing trend of relative velocity changes and reached a minimum value of -0.6% at the end of the experiment. No change was detected on the digital elevation model that was computed from terrestrial laser scanning images, due to the absence of centimeter scale superficial fissures. At natural scale (Sobradinho landslide), no significant variation in relative velocity changes was detected for the rainy and non-rainy days, mainly because of the inadequate change in the degree of saturation, which was found within a relatively short period of data acquisition.
Yawar Hussain; Martin Cardenas-Soto; Rogerio Uagoda; Salvatore Martino; Juan Rodriguez-Rebolledo; Omar Hamza; Hernan Martinez-Carvajal. Monitoring of Sobradinho landslide (Brasília, Brazil) and a prototype vertical slope by time-lapse interferometry. Brazilian Journal of Geology 2019, 49, 1 .
AMA StyleYawar Hussain, Martin Cardenas-Soto, Rogerio Uagoda, Salvatore Martino, Juan Rodriguez-Rebolledo, Omar Hamza, Hernan Martinez-Carvajal. Monitoring of Sobradinho landslide (Brasília, Brazil) and a prototype vertical slope by time-lapse interferometry. Brazilian Journal of Geology. 2019; 49 (2):1.
Chicago/Turabian StyleYawar Hussain; Martin Cardenas-Soto; Rogerio Uagoda; Salvatore Martino; Juan Rodriguez-Rebolledo; Omar Hamza; Hernan Martinez-Carvajal. 2019. "Monitoring of Sobradinho landslide (Brasília, Brazil) and a prototype vertical slope by time-lapse interferometry." Brazilian Journal of Geology 49, no. 2: 1.
En este artículo se describe una metodología basada en el método de estimación puntual de Rosenblueth para el análisis del empuje activo desarrollado en un muro de retención con relleno cohesivo-friccionante bajo condiciones de carga sísmica. El principio básico de esta metodología es usar dos estimaciones puntales, i.e., la desviación estándar y el valor medio, para examinar una variable en el análisis de seguridad. Es posible mostrar que aumentando el valor del coeficiente de aceleración sísmica horizontal, el factor de seguridad por volteo decrece y la probabilidad de falla aumenta, especialmente para coeficientes mayores que 0.2. Por otro lado, es observado que el valor medio del factor de seguridad crece cuando aumenta el coeficiente de aceleración sísmica vertical, sin embargo la probabilidad de falla se mantiene prácticamente igual para el valor del factor de seguridad considerado como crítico (1.15).
André Luís Brasil Cavalcante; Juan Félix Rodríguez Rebolledo. Probabilistic analysis of the active earth pressure on retaining wall for c-f soil backfill under seismic loading conditions. DYNA 2017, 84, 9 -15.
AMA StyleAndré Luís Brasil Cavalcante, Juan Félix Rodríguez Rebolledo. Probabilistic analysis of the active earth pressure on retaining wall for c-f soil backfill under seismic loading conditions. DYNA. 2017; 84 (202):9-15.
Chicago/Turabian StyleAndré Luís Brasil Cavalcante; Juan Félix Rodríguez Rebolledo. 2017. "Probabilistic analysis of the active earth pressure on retaining wall for c-f soil backfill under seismic loading conditions." DYNA 84, no. 202: 9-15.
Gabriel Auvinet-Guichard; Universidad Nacional Autónoma De México - Instituto De Ingeniería; Juan Félix Rodríguez-Rebolledo; Universidade de Brasília - Faculdade de Tecnologia. Criteria for the design of friction piles subjected to negative skin friction and transient loads. Ingeniería Investigación y Tecnología 2017, 18, 279 -292.
AMA StyleGabriel Auvinet-Guichard, Universidad Nacional Autónoma De México - Instituto De Ingeniería, Juan Félix Rodríguez-Rebolledo, Universidade de Brasília - Faculdade de Tecnologia. Criteria for the design of friction piles subjected to negative skin friction and transient loads. Ingeniería Investigación y Tecnología. 2017; 18 (3):279-292.
Chicago/Turabian StyleGabriel Auvinet-Guichard; Universidad Nacional Autónoma De México - Instituto De Ingeniería; Juan Félix Rodríguez-Rebolledo; Universidade de Brasília - Faculdade de Tecnologia. 2017. "Criteria for the design of friction piles subjected to negative skin friction and transient loads." Ingeniería Investigación y Tecnología 18, no. 3: 279-292.
The paper shows how axisymmetric finite element numerical models can be used to optimize the design of friction piles foundations in an environment that is prone to regional subsidence. The study considers friction piles in typical Mexico City soft clays, that are subjected to external loads and soil consolidation due to variations in piezometric conditions. The constitutive models used to numerically simulate the behavior of the clays vary from a basic elastic perfectly-plastic model to a critical state model that is able to account for the anisotropic yielding behavior of Mexico City clay. The simulations consider the long term behavior of the internal piles within a large pile group.
Juan Félix Rodríguez Rebolledo; Gabriel Y. Auvinet-Guichard; Hernán E. Martínez-Carvajal. Settlement analysis of friction piles in consolidating soft soils. DYNA 2015, 82, 211 -220.
AMA StyleJuan Félix Rodríguez Rebolledo, Gabriel Y. Auvinet-Guichard, Hernán E. Martínez-Carvajal. Settlement analysis of friction piles in consolidating soft soils. DYNA. 2015; 82 (192):211-220.
Chicago/Turabian StyleJuan Félix Rodríguez Rebolledo; Gabriel Y. Auvinet-Guichard; Hernán E. Martínez-Carvajal. 2015. "Settlement analysis of friction piles in consolidating soft soils." DYNA 82, no. 192: 211-220.
The drainage system of Mexico City, one of the largest metropolitan areas in the world, is formed by a large network of interceptors and collectors leading to the main outlet: a 49.3-km-long tunnel with a 6.5 m diameter. To build the access shafts to the tunnels of the system and the deep sumps of the pumping stations in the very soft clays of the lacustrine area of Mexico valley, a technique known as “flotation method” has been commonly used since 1969. The paper presents the main construction steps followed and some aspects of the analysis and design of shafts constructed by this technique. The experience gained obtained after more than 30 shafts have been constructed by this method, and the actual trends in its application are also discussed.
Gabriel Auvinet-Guichard; Juan F. Rodríguez-Rebolledo; José L. Rangel-Núñez. Construction of deep tunnel shafts in Mexico city soft clays by the flotation method. Acta Geotechnica 2010, 5, 63 -68.
AMA StyleGabriel Auvinet-Guichard, Juan F. Rodríguez-Rebolledo, José L. Rangel-Núñez. Construction of deep tunnel shafts in Mexico city soft clays by the flotation method. Acta Geotechnica. 2010; 5 (1):63-68.
Chicago/Turabian StyleGabriel Auvinet-Guichard; Juan F. Rodríguez-Rebolledo; José L. Rangel-Núñez. 2010. "Construction of deep tunnel shafts in Mexico city soft clays by the flotation method." Acta Geotechnica 5, no. 1: 63-68.