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The fractal geometry method has been employed to quantitatively characterize the roughness of a rock discontinuity, which is one of the key factors affecting its shear strength and the seepage characteristics of a rock mass. However, the current fractal methods involving the three-dimensional discontinuity morphology suffer from one or more problems, such as a complicated calculation procedure, an inaccurate calculation result and an inability to characterize the undulation and anisotropy of a discontinuity. To cope with these problems, the discontinuities in artificial granite samples with irregular and undulating surfaces were taken as examples, and a quantitative study on the discontinuity morphology was conducted based on the method of three-dimensional laser scanning in combination with ArcGIS data processing, geographical research, theoretical calculations and regression analysis. After performing systematic research, we proposed an extensive 3D fractal dimension including three discontinuity morphological parameters, i.e. the fractal dimension of discontinuity morphology, the ratio between the maximal undulating amplitude and the discontinuity length, and the average value of all the apparent dip angles of the discontinuity surfaces dipping opposite the shear direction. The extensive 3D fractal dimension can comprehensively characterize the roughness, undulation and anisotropy of the discontinuity morphology. A set of theoretical calculation methods were then developed to determine the three discontinuity morphological parameters of the extensive 3D fractal dimension based on ArcGIS. We finally established a mathematical expression of the extensive 3D fractal dimension. Compared with the current fractal methods, the extensive 3D fractal dimension can effectively compensate for the inability to characterize the undulation and anisotropy of the discontinuity morphology. Its calculation methods have the advantages of simplification, low-time consumption and high precision.
Bowen Zheng; Shengwen Qi; Guangming Luo; Fangcui Liu; Xiaolin Huang; Songfeng Guo. Characterization of discontinuity surface morphology based on 3D fractal dimension by integrating laser scanning with ArcGIS. Bulletin of Engineering Geology and the Environment 2021, 80, 2261 -2281.
AMA StyleBowen Zheng, Shengwen Qi, Guangming Luo, Fangcui Liu, Xiaolin Huang, Songfeng Guo. Characterization of discontinuity surface morphology based on 3D fractal dimension by integrating laser scanning with ArcGIS. Bulletin of Engineering Geology and the Environment. 2021; 80 (3):2261-2281.
Chicago/Turabian StyleBowen Zheng; Shengwen Qi; Guangming Luo; Fangcui Liu; Xiaolin Huang; Songfeng Guo. 2021. "Characterization of discontinuity surface morphology based on 3D fractal dimension by integrating laser scanning with ArcGIS." Bulletin of Engineering Geology and the Environment 80, no. 3: 2261-2281.
Laboratory tests revealed that by enhancing the weathering degree, a transition of pre-peak mechanical responses of crystalline rocks under unconfined compression from approximate linearity to nonlinearity was evident, as was the weakening of macro-mechanical properties. However, thus far, very few numerical studies have been conducted to quantitatively characterize the strong-to-weak transition of the mechanical behaviors of crystalline rocks modulated by the weathering degree. We propose an advanced grain-based model (AGBM) using Universal Distinct Element Code (UDEC) to characterize mechanical characteristics of crystalline rocks with different weathering degrees. The weathering-induced deterioration of microstructures was treated as loosening of grain contacts and weakening of their properties. It was proved that the grain contact model that considered hardening nonlinear deformation in compression and linearly elastic deformation in tension or shear was feasible and applicable to characterize the mechanical behaviors of crystalline rocks with different weathering degrees. The compression hardening deformation of grain contacts significantly affected the macro nonlinear stress-strain relation and stress thresholds of crack closure, crack imitation, stable crack growth, and unstable crack growth. We acquired new insights on the weathering-induced weakening of macro-mechanical characteristics of crystalline rock, which resulted from weakening of deformation properties of the grain contact more than grain contact strength.
Xiaolin Huang; Shengwen Qi; Bowen Zheng; Ning Liang; Lihui Li; Lei Xue; Songfeng Guo; Xiang Sun; Daping Tai. An advanced grain-based model to characterize mechanical behaviors of crystalline rocks with different weathering degrees. Engineering Geology 2020, 280, 105951 .
AMA StyleXiaolin Huang, Shengwen Qi, Bowen Zheng, Ning Liang, Lihui Li, Lei Xue, Songfeng Guo, Xiang Sun, Daping Tai. An advanced grain-based model to characterize mechanical behaviors of crystalline rocks with different weathering degrees. Engineering Geology. 2020; 280 ():105951.
Chicago/Turabian StyleXiaolin Huang; Shengwen Qi; Bowen Zheng; Ning Liang; Lihui Li; Lei Xue; Songfeng Guo; Xiang Sun; Daping Tai. 2020. "An advanced grain-based model to characterize mechanical behaviors of crystalline rocks with different weathering degrees." Engineering Geology 280, no. : 105951.
Characterization of the tensile mechanical behaviors of rocks under dynamic loads is of great significance for the practical engineering. However, thus far, its micromechanics have rarely been studied. This paper micromechanically investigated the compression-induced tensile mechanical behaviors of the crystalline rock using the grain-based model (GBM) by universal distinct element code (UDEC). Results showed that the crystalline rock has the rate- and heterogeneity-dependency of tensile behaviors. Essentially, dynamic Brazilian tensile strength increased in a linear manner as the loading rate increased. With the size distribution and morphology of grain-scale heterogeneity weakened, it increased, and this trend was obviously enhanced as the loading rate increased. Additionally, the rate-dependent characteristic became strong with the grain heterogeneity weakened. The grain heterogeneity prominently affected the stress distribution inside the synthetic crystalline rock, especially in the mixed compression and tension zone. Due to heterogeneity, there were tensile stress concentrations (TSCs) in the sample which could favor microcracking and strength weakening of the sample. As the grain heterogeneity weakened or the loading rate increased, the magnitude of the TSC had a decreasing trend and there was a transition from the sharp TSC to the smooth tensile stress distribution zone. The progressive failure of the crystalline rock was notably influenced by the loading rate, which mainly represented the formation of the crushing zone adjacent to two loading points. Our results are meaningful for the practical engineering such as underground protection works from stress waves.
Bowen Zheng; Shengwen Qi; Xiaolin Huang; Ning Liang; Songfeng Guo. Compression-Induced Tensile Mechanical Behaviors of the Crystalline Rock under Dynamic Loads. Materials 2020, 13, 5107 .
AMA StyleBowen Zheng, Shengwen Qi, Xiaolin Huang, Ning Liang, Songfeng Guo. Compression-Induced Tensile Mechanical Behaviors of the Crystalline Rock under Dynamic Loads. Materials. 2020; 13 (22):5107.
Chicago/Turabian StyleBowen Zheng; Shengwen Qi; Xiaolin Huang; Ning Liang; Songfeng Guo. 2020. "Compression-Induced Tensile Mechanical Behaviors of the Crystalline Rock under Dynamic Loads." Materials 13, no. 22: 5107.
The shear strength characteristics of rock masses containing non-persistent discontinuities are strongly affected by discontinuities and rock bridges. The linear Jennings criterion cannot reflect the nonlinear mechanical behavior during progressive failure of rock masses with non-persistent discontinuities. In this study, a new nonlinear shear strength criterion was developed. First of all, a series of shear test data about artificial rock mass samples were collected on the basis of the published literatures, and five types of samples were differentiated according to the positions of discontinuities. After that, a new nonlinear shear strength criterion was proposed by introducing two correction coefficients A and B into the basic form of the Jennings criterion, which could correct the weight of the cohesion and the internal friction coefficient of rock bridges respectively. Then, the new criterion was determined by fitting the basic form of the Jennings criterion with the laboratory data. It was found that the parameters A and B had a nonlinear exponential and negative exponential relation with the connectivity rate respectively. It indicated that both the cohesion and the internal friction coefficient estimated by the new criterion were superior to those estimated by the Jennings criterion. Compared with the linear Jennings criterion, the new nonlinear shear strength criterion had a better applicability.
Bowen Zheng; Shengwen Qi; Songfeng Guo; Xiaolin Huang; Ning Liang; Yu Zou; Guangming Luo. A New Shear Strength Criterion for Rock Masses with Non-Persistent Discontinuities Considering the Nonlinear Progressive Failure Process. Materials 2020, 13, 4694 .
AMA StyleBowen Zheng, Shengwen Qi, Songfeng Guo, Xiaolin Huang, Ning Liang, Yu Zou, Guangming Luo. A New Shear Strength Criterion for Rock Masses with Non-Persistent Discontinuities Considering the Nonlinear Progressive Failure Process. Materials. 2020; 13 (21):4694.
Chicago/Turabian StyleBowen Zheng; Shengwen Qi; Songfeng Guo; Xiaolin Huang; Ning Liang; Yu Zou; Guangming Luo. 2020. "A New Shear Strength Criterion for Rock Masses with Non-Persistent Discontinuities Considering the Nonlinear Progressive Failure Process." Materials 13, no. 21: 4694.
Empirical methods are commonly employed to predict the PGA distribution of an earthquake and are widely used. However, current empirical methods assume the seismic source to be a point source, a line source, or a plane source, where the energy is concentrated and released uniformly. An empirical attenuation model of the near-field peak ground acceleration (PGA) was proposed that considers a nonuniform spatial distribution of seismic fault energy and its 3D scale. Then, this model was used to reconstruct the PGA distribution of the 2008 Wenchuan, China, Mw7.9 earthquake based on the data of a seismic fault model and ground acceleration records of the mainshock and aftershocks collected by seismic stations. The predicted PGA values show similar attenuation characteristics to the interpolated map of the PGA recorded by seismic stations. A comparison with the results of a finite-fault model developed by the USGS indicates that the proposed model can provide more details and give a more precise result in the near field. The analysis of landslides triggered by the Wenchuan earthquake demonstrates that the PGA distribution estimated by this model can be used to validate the findings of other researchers.
Xianglong Yao; Shengwen Qi; Chunling Liu; Songfeng Guo; Xiaoling Huang; Chong Xu; Bowen Zheng; Zhifa Zhan; Yu Zou. An empirical attenuation model of the peak ground acceleration (PGA) in the near field of a strong earthquake. Natural Hazards 2020, 105, 691 -715.
AMA StyleXianglong Yao, Shengwen Qi, Chunling Liu, Songfeng Guo, Xiaoling Huang, Chong Xu, Bowen Zheng, Zhifa Zhan, Yu Zou. An empirical attenuation model of the peak ground acceleration (PGA) in the near field of a strong earthquake. Natural Hazards. 2020; 105 (1):691-715.
Chicago/Turabian StyleXianglong Yao; Shengwen Qi; Chunling Liu; Songfeng Guo; Xiaoling Huang; Chong Xu; Bowen Zheng; Zhifa Zhan; Yu Zou. 2020. "An empirical attenuation model of the peak ground acceleration (PGA) in the near field of a strong earthquake." Natural Hazards 105, no. 1: 691-715.
This paper microscopically investigated progressive failure characteristics of brittle rock under high-strain-rate compression using the bonded particle model (BPM). We considered the intact sample and the flawed sample loaded by split Hopkinson pressure bar respectively. Results showed that the progressive failure characteristics of the brittle rock highly depended on the strain rate. The intact sample first experienced in microcracking, then crack coalescing, and finally splitting into fragments. The total number of the micro cracks, the proportion of the shear cracks, the number of fragments and the strain at the peak stress all increased with the increasing strain rate. Also, a transition existed for the failure of the brittle rock from brittleness to ductility as the strain rate increased. For the flawed sample, the microcracking initiation position and the types of the formed macro cracks were influenced by the flaw angle in the initial stage. However, propagation of these early-formed macro cracks were prohibited in the later stages. New micro cracks were produced and then coalesced into diagonal macro cracks which could all form ‘X’-shape failure configuration regardless of the incline angle of the flaw. We explored micromechanics on progressive failure characteristics of the brittle rock under dynamic loads.
Xiaolin Huang; Shengwen Qi; Bowen Zheng; Songfeng Guo; Ning Liang; Zhifa Zhan. Progressive Failure Characteristics of Brittle Rock under High-Strain-Rate Compression Using the Bonded Particle Model. Materials 2020, 13, 3943 .
AMA StyleXiaolin Huang, Shengwen Qi, Bowen Zheng, Songfeng Guo, Ning Liang, Zhifa Zhan. Progressive Failure Characteristics of Brittle Rock under High-Strain-Rate Compression Using the Bonded Particle Model. Materials. 2020; 13 (18):3943.
Chicago/Turabian StyleXiaolin Huang; Shengwen Qi; Bowen Zheng; Songfeng Guo; Ning Liang; Zhifa Zhan. 2020. "Progressive Failure Characteristics of Brittle Rock under High-Strain-Rate Compression Using the Bonded Particle Model." Materials 13, no. 18: 3943.
A rock mass often contains joints filled with a viscoelastic medium of which seismic response is significant to geophysical exploration and seismic engineering design. Using the propagator matrix method, an analytical model was established to characterize the seismic response of viscoelastic filled joints. Stress wave propagation through a single joint highly depended on the water content and thickness of the filling as well as the frequency and incident angle of the incident wave. The increase in the water content enhanced the viscosity (depicted by quality factor) of the filled joint, which could promote equivalent joint stiffness and energy dissipation with double effects on stress wave propagation. There existed multiple reflections when the stress wave propagated through a set of filled joints. The dimensionless joint spacing was the main controlling factor in the seismic response of the multiple filled joints. As it increased, the transmission coefficient first increased, then it decreased instead, and at last it basically kept invariant. The effect of multiple reflections was weakened by increasing the water content, which further influenced the variation of the transmission coefficient. The water content of the joint filling should be paid more attention in practical applications.
Xiaolin Huang; Shengwen Qi; Bowen Zheng; Youshan Liu; Lei Xue; Ning Liang. Stress Wave Propagation through Rock Joints Filled with Viscoelastic Medium Considering Different Water Contents. Applied Sciences 2020, 10, 4797 .
AMA StyleXiaolin Huang, Shengwen Qi, Bowen Zheng, Youshan Liu, Lei Xue, Ning Liang. Stress Wave Propagation through Rock Joints Filled with Viscoelastic Medium Considering Different Water Contents. Applied Sciences. 2020; 10 (14):4797.
Chicago/Turabian StyleXiaolin Huang; Shengwen Qi; Bowen Zheng; Youshan Liu; Lei Xue; Ning Liang. 2020. "Stress Wave Propagation through Rock Joints Filled with Viscoelastic Medium Considering Different Water Contents." Applied Sciences 10, no. 14: 4797.
The shear strength of the rock discontinuities under different shear rates is of great importance to evaluate the stability of rock mass engineering, which is remarkably influenced by the size effects induced by both the length and the undulated amplitude of discontinuities. An advanced shear strength criterion taking into account the size and the shear rate simultaneously was proposed. There is an advantage of the dimension unity in terms of the new shear strength criterion in comparison to previous related empirical equations. Additionally, it can be degraded into the International Society for Rock Mechanics (ISRM)-suggested Barton shear strength empirical equation on the peak shear strength of the rock discontinuities. Then, based on a new dynamic direct shear testing device on rock joints, the granite discontinuities with various lengths (200 mm to 1000 mm) and undulated amplitudes (3 mm to 23 mm) were designed to conduct direct shear tests under different low shear rates (0 mm/s to 1 mm/s) to verify the involved empirical equations. It was found that the results predicted by the new shear strength criterion agreed well with the experimental results. It was proved that the new shear strength criterion had a better applicability to characterize the shear strength of the rock discontinuities.
Bowen Zheng; Shengwen Qi; Xiaolin Huang; Songfeng Guo; Chonglang Wang; Zhifa Zhan; Guangming Luo. An Advanced Shear Strength Criterion for Rock Discontinuities Considering Size and Low Shear Rate. Applied Sciences 2020, 10, 1 .
AMA StyleBowen Zheng, Shengwen Qi, Xiaolin Huang, Songfeng Guo, Chonglang Wang, Zhifa Zhan, Guangming Luo. An Advanced Shear Strength Criterion for Rock Discontinuities Considering Size and Low Shear Rate. Applied Sciences. 2020; 10 (12):1.
Chicago/Turabian StyleBowen Zheng; Shengwen Qi; Xiaolin Huang; Songfeng Guo; Chonglang Wang; Zhifa Zhan; Guangming Luo. 2020. "An Advanced Shear Strength Criterion for Rock Discontinuities Considering Size and Low Shear Rate." Applied Sciences 10, no. 12: 1.
Laminae are well developed in shale and generally influence fracture propagation during hydraulic fracturing. Hence, comprehensively understanding the tension and shear behaviors of shale laminae is crucial. There have been limited systematic studies thus far on the tensile and shear strength as well as fracture morphology of shale laminae. In this study, the Lower Silurian Longmaxi Shale (China) was investigated via Brazilian tensile and angle-varied plate shear tests. Five lamina types were tested, i.e., calcite (Cal), pyrite (Py), organic-enriched (Oc), the interface between Cal and Oc (Cal-Oc), and the interface between Py and Oc (Py-Oc) laminae. Results showed that the tensile strength was in the range 0.43–8.22 MPa, mainly in the order of Cal > Py > Cal-Oc > Py-Oc > Oc. The modes of fracture morphology were highly related to the occurrence, continuity, and mineralogy fillings of laminae. Shear strength parameters were within the range 22.50–29.64 MPa for cohesion and 37.29–43.60° for internal friction angle. Fracture surface roughness was strongly related to its cohesion. Calcite laminae considerably influenced the tensile fracturing of shale, suggesting that the geometry and properties of calcite lamina should receive more attention during the design of shale gas exploration.
Lihui Li; Beixiu Huang; Xiaolin Huang; Ming Wang; Xiao Li. Tensile and Shear Mechanical Characteristics of Longmaxi Shale Laminae Dependent on the Mineral Composition and Morphology. Energies 2020, 13, 2977 .
AMA StyleLihui Li, Beixiu Huang, Xiaolin Huang, Ming Wang, Xiao Li. Tensile and Shear Mechanical Characteristics of Longmaxi Shale Laminae Dependent on the Mineral Composition and Morphology. Energies. 2020; 13 (11):2977.
Chicago/Turabian StyleLihui Li; Beixiu Huang; Xiaolin Huang; Ming Wang; Xiao Li. 2020. "Tensile and Shear Mechanical Characteristics of Longmaxi Shale Laminae Dependent on the Mineral Composition and Morphology." Energies 13, no. 11: 2977.
Filled fractures commonly exist in the earth medium and occur at all scales, such as filled joints and gouge‐filled faults. The compression behavior of a filled fracture is important for understanding its seismic response, although this has rarely been studied. In this study, laboratory tests were conducted to investigate the compression behavior of a simulated filled fracture under different stress states. It was found that the simulated fracture was compacted and experienced strain‐hardening deformation under low compressive stress. Its compression behavior was described by the Bandis‐Barton (B‐B) model. When the compressive stress was high, numerous particles in the fillings were crushed and the filled fracture weakened, while its stiffness abruptly decreased. This process was related to the strain‐softening deformation. As the compressive stress increased further, fillings were compacted again and some particles were crushed. The unloading deformation of a filled fracture had an obvious hysteresis characteristic. A modified B‐B (MB‐B) model was proposed to characterize the deformation behavior of the filled fracture under high stress states. It was proven that the MB‐B model can characterize the effect of the particle crushing on the deformation behavior of the filled fracture and also has the capability to capture the seismic response of the filled fracture under high amplitude stress waves. The results of this study indicate a new and attractive form of dynamic weakening of the granular gouge, which resulted from particle crushing. They can be used to understand the dynamic weakening mechanisms of a gouge‐filled fault under high amplitude stress waves.
Xiaolin Huang; Shengwen Qi; Kaiwen Xia; Xiaoshan Shi. Particle Crushing of a Filled Fracture During Compression and Its Effect on Stress Wave Propagation. Journal of Geophysical Research: Solid Earth 2018, 123, 5559 -5587.
AMA StyleXiaolin Huang, Shengwen Qi, Kaiwen Xia, Xiaoshan Shi. Particle Crushing of a Filled Fracture During Compression and Its Effect on Stress Wave Propagation. Journal of Geophysical Research: Solid Earth. 2018; 123 (7):5559-5587.
Chicago/Turabian StyleXiaolin Huang; Shengwen Qi; Kaiwen Xia; Xiaoshan Shi. 2018. "Particle Crushing of a Filled Fracture During Compression and Its Effect on Stress Wave Propagation." Journal of Geophysical Research: Solid Earth 123, no. 7: 5559-5587.
The purpose of this article is to further investigate the seismic response of an artificial filled joint under high-amplitude stress waves considering the effect of filling humidity, following our earlier work on dry infill. A steel split Hopkinson pressure bar system is utilized to induce high-amplitude stress waves to the filled joint. In this study, the wet infill is a mixture composed of quartz sand, kaolinite clay, and water. It is found that when the water content is relatively low, i.e., 8.25 %, the seismic response of the joint with wet infill is similar to that of the joint with dry infill, as shown in the literature. When the stress wave amplitude increases, the infill is progressively compacted and the transmission coefficient increases. However, there exists a crushing deformation stage for the infill in which many particles are crushed, and the transmission coefficient decreases as the incident wave amplitude increases. The water in the infill can reduce the friction between grains, which may lead to the decrease of the joint stiffness. As a result, the transmission coefficient is smaller than the case with dry infill under similar loading conditions. When the water content is moderate, such as 16.75 %, particles are very difficult to crush and the infill dominantly experiences compaction even when loaded by very high-amplitude stress waves. Consequently, the transmission coefficient through the wet infill always increases with the increase of the incident wave amplitude. When the infill is fully saturated (water content = 25.0 %), it can only experience approximately elastic deformation, and few particles can be crushed. In this case, the transmission coefficient is independent of the incident wave amplitude. When the infill is dry or fully saturated, the transmission coefficient is insensitive to the amplitude of the incident wave.
Xiaolin Huang; Shengwen Qi; Wei Yao; Kaiwen Xia. Effect of Filling Humidity on the Propagation of High-Amplitude Stress Waves through an Artificial Joint. Geotechnical Testing Journal 2018, 42, 1 .
AMA StyleXiaolin Huang, Shengwen Qi, Wei Yao, Kaiwen Xia. Effect of Filling Humidity on the Propagation of High-Amplitude Stress Waves through an Artificial Joint. Geotechnical Testing Journal. 2018; 42 (1):1.
Chicago/Turabian StyleXiaolin Huang; Shengwen Qi; Wei Yao; Kaiwen Xia. 2018. "Effect of Filling Humidity on the Propagation of High-Amplitude Stress Waves through an Artificial Joint." Geotechnical Testing Journal 42, no. 1: 1.
This paper numerically investigates the seismic response of the filled joint under high amplitude stress waves using the combined finite-discrete element method (FDEM). A thin layer of independent polygonal particles are used to simulate the joint fillings. Each particle is meshed using the Delaunay triangulation scheme and can be crushed when the load exceeds its strength. The propagation of the 1D longitude wave through a single filled joint is studied, considering the influences of the joint thickness and the characteristics of the incident wave, such as the amplitude and frequency. The results show that the filled particles under high amplitude stress waves mainly experience three deformation stages: (i) initial compaction stage; (ii) crushing stage; and (iii) crushing and compaction stage. In the initial compaction stage and crushing and compaction stage, compaction dominates the mechanical behavior of the joint, and the particle area distribution curve varies little. In these stages, the transmission coefficient increases with the increase of the amplitude, i.e., peak particle velocity (PPV), of the incident wave. On the other hand, in the crushing stage, particle crushing plays the dominant role. The particle size distribution curve changes abruptly with the PPV due to the fragments created by the crushing process. This process consumes part of wave energy and reduces the stiffness of the filled joint. The transmission coefficient decreases with increasing PPV in this stage because of the increased amount of energy consumed by crushing. Moreover, with the increase of the frequency of the incident wave, the transmission coefficient decreases and fewer particles can be crushed. Under the same incident wave, the transmission coefficient decreases when the filled thickness increases and the filled particles become more difficult to be crushed.
Xiaolin Huang; Qi Zhao; Shengwen Qi; Kaiwen Xia; Giovanni Grasselli; Xuguang Chen. Numerical Simulation on Seismic Response of the Filled Joint under High Amplitude Stress Waves Using Finite-Discrete Element Method (FDEM). Materials 2016, 10, 13 .
AMA StyleXiaolin Huang, Qi Zhao, Shengwen Qi, Kaiwen Xia, Giovanni Grasselli, Xuguang Chen. Numerical Simulation on Seismic Response of the Filled Joint under High Amplitude Stress Waves Using Finite-Discrete Element Method (FDEM). Materials. 2016; 10 (1):13.
Chicago/Turabian StyleXiaolin Huang; Qi Zhao; Shengwen Qi; Kaiwen Xia; Giovanni Grasselli; Xuguang Chen. 2016. "Numerical Simulation on Seismic Response of the Filled Joint under High Amplitude Stress Waves Using Finite-Discrete Element Method (FDEM)." Materials 10, no. 1: 13.
This paper investigates the propagation of high amplitude stress waves through a filled joint using a modified steel split Hopkinson pressure bar (SHPB) system. Quartz sand fillings with various thickness are placed in a steel tube and then sandwiched between the incident and transmitted bars to simulate the filled rock joints. Using SHPB, the incident stress waves with similar frequency spectrum but varying amplitude are induced to load the artificial filled joints. The particle size distributions of the fillings after tests are analyzed. It is discovered that as the amplitude of the incident wave increases, the fillings experience three stages of deformation: initial compaction, crushing and crushing and compaction. In the initial compaction stage and the crushing and compaction stage, the fillings are mainly compacted, and thus the transmission coefficient increases with the amplitude of the incident wave. However in the crushing stage, the transmission coefficient decreases with the increase of the amplitude of the incident wave. This is a result of energy consumption due to particle crushing. The observed dependence of the transmission coefficient on the wave amplitude is consistent with the particle size distribution of recovered fillings.
Xiaolin Huang; Shengwen Qi; Kaiwen Xia; Hong Zheng; Bowen Zheng. Propagation of high amplitude stress waves through a filled artificial joint: An experimental study. Journal of Applied Geophysics 2016, 130, 1 -7.
AMA StyleXiaolin Huang, Shengwen Qi, Kaiwen Xia, Hong Zheng, Bowen Zheng. Propagation of high amplitude stress waves through a filled artificial joint: An experimental study. Journal of Applied Geophysics. 2016; 130 ():1-7.
Chicago/Turabian StyleXiaolin Huang; Shengwen Qi; Kaiwen Xia; Hong Zheng; Bowen Zheng. 2016. "Propagation of high amplitude stress waves through a filled artificial joint: An experimental study." Journal of Applied Geophysics 130, no. : 1-7.