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In this study, changes in the permeability characteristics of a geotextile–polynorbornene liner at different oil pollutant contact times were evaluated. Experiments and numerical analyses were performed, and ASTM D5887 and ASTM D6766 were applied as test methods. The test results show that, when the pollutant contact time and pressure head were 4 h and 75 kPa, the reaction between the geotextile–polynorbornene liner and the pollutant was almost complete. Moreover, a numerical analysis was used to measure the ratio of the concentration of the pollutant that permeated through the geotextile–polynorbornene liner to the initial pollutant concentration at different pollutant contact times. The ratio was between 70 and 83% after a pollutant contact time of 0.5 h and between 0.1 and 1.0% after 4 h. The test and numerical analysis results confirm that, as a reactive medium, the geotextile–polynorbornene liner can effectively prevent the diffusion of oil pollutants by changing its permeability characteristics.
JeongJun Park. Evaluation of Changes in the Permeability Characteristics of a Geotextile–Polynorbornene Liner for the Prevention of Pollutant Diffusion in Oil-Contaminated Soils. Sustainability 2021, 13, 4797 .
AMA StyleJeongJun Park. Evaluation of Changes in the Permeability Characteristics of a Geotextile–Polynorbornene Liner for the Prevention of Pollutant Diffusion in Oil-Contaminated Soils. Sustainability. 2021; 13 (9):4797.
Chicago/Turabian StyleJeongJun Park. 2021. "Evaluation of Changes in the Permeability Characteristics of a Geotextile–Polynorbornene Liner for the Prevention of Pollutant Diffusion in Oil-Contaminated Soils." Sustainability 13, no. 9: 4797.
This study investigated the effect of vegetation plant roots on the stability of the cover slopes of solid waste landfills. A large direct shear test and a root tensile strength test were conducted to quantify the effect of rooted soil of revegetation plants on the increment in shear strength of the soil as a method to protect the cover slope of solid waste landfills. In the large direct shear test, an increase in the shear strength of the ground with the presence of roots was observed, and the root reinforcement proposed in the literature was modified and proposed by analyzing the correlation between the root diameter and the tensile strength according to water content. The stability of the slope revegetation of a landfill facility, considering the root reinforcement effect of revegetation, was calculated by conducting a slope stability analysis reflecting the unsaturated seepage analysis of rainfall conditions for various analysis conditions, such as the gradient, the degree of compactness, the thickness of the cover, and the rooted soil depth of the landfill facility.
JeongJun Park; Indae Kim; Jeong-Ku Kang. Root Reinforcement Effect on Cover Slopes of Solid Waste Landfill in Soil Bioengineering. Sustainability 2021, 13, 3991 .
AMA StyleJeongJun Park, Indae Kim, Jeong-Ku Kang. Root Reinforcement Effect on Cover Slopes of Solid Waste Landfill in Soil Bioengineering. Sustainability. 2021; 13 (7):3991.
Chicago/Turabian StyleJeongJun Park; Indae Kim; Jeong-Ku Kang. 2021. "Root Reinforcement Effect on Cover Slopes of Solid Waste Landfill in Soil Bioengineering." Sustainability 13, no. 7: 3991.
This paper presents an experimental study on the pullout resistance of a newly improved reinforcement. The applied reinforcement was a smooth steel strip reinforcement with transverse members used to improve the pullout-resistance problems of the smooth steel strip reinforcement. The pullout and bearing resistance of the improved reinforcement were evaluated using results of large-scale pullout tests. The evaluation result confirmed that the bearing resistance of the improved reinforcement was about 33–66% of the total pullout resistance, and it had an evenly distributed friction and bearing resistance. The bearing bond coefficient, considering the interference effect, gradually converged when normal stress was higher than a certain value. This result confirmed that the increment of interference effect is caused by the increment of the transverse member and normal stress. In the pullout-resistance evaluation of the improved reinforcement, a number of transverse members can be predicted using the relationship between bearing-resistance stress and the bearing bond coefficient due to normal stress, which can be applied as a reasonable prediction method.
Jung-Geun Han; Kwang-Wu Lee; Jong-Young Lee; Gigwon Hong; JeongJun Park. Experimental Study on the Pullout Resistance of Smooth Steel Strip Reinforcement with Transverse Members. Applied Sciences 2021, 11, 2776 .
AMA StyleJung-Geun Han, Kwang-Wu Lee, Jong-Young Lee, Gigwon Hong, JeongJun Park. Experimental Study on the Pullout Resistance of Smooth Steel Strip Reinforcement with Transverse Members. Applied Sciences. 2021; 11 (6):2776.
Chicago/Turabian StyleJung-Geun Han; Kwang-Wu Lee; Jong-Young Lee; Gigwon Hong; JeongJun Park. 2021. "Experimental Study on the Pullout Resistance of Smooth Steel Strip Reinforcement with Transverse Members." Applied Sciences 11, no. 6: 2776.
In this study, the effects of the mixing conditions of waste paper sludge ash (WPSA) on the strength and bearing capacity of controlled low-strength material (CLSM) were evaluated, and the optimal mixing conditions were used to evaluate the strength characteristics of CLSM with recyclable WPSA. The strength and bearing capacity of CLSM with WPSA were evaluated using unconfined compressive strength tests and plate bearing tests, respectively. The unconfined compressive strength test results show that the optimal mixing conditions for securing 0.8–1.2 MPa of target strength under 5% of cement content conditions can be obtained when both WPSA and fly ash are used. This is because WPSA and fly ash, which act as binders, have a significant impact on overall strength when the cement content is low. The bearing capacity of weathered soil increased from 550 to 575 kPa over time, and CLSM with WPSA increased significantly, from 560 to 730 kPa. This means that the bearing capacity of CLSM with WPSA was 2.0% higher than that of weathered soil immediately after construction; furthermore, it was 27% higher at 60 days of age. In addition, the allowable bearing capacity of CLSM corresponding to the optimal mixing conditions was evaluated, and it was found that this value increased by 30.4% until 60 days of age. This increase rate was 6.7 times larger than that of weathered soil (4.5%). Therefore, based on the allowable bearing capacity calculation results, CLSM with WPSA was applied as a sewage pipe backfill material. It was found that CLSM with WPSA performed better as backfill and was more stable than soil immediately after construction. The results of this study confirm that CLSM with WPSA can be utilized as sewage pipe backfill material.
JeongJun Park; Gigwon Hong. Strength Characteristics of Controlled Low-Strength Materials with Waste Paper Sludge Ash (WPSA) for Prevention of Sewage Pipe Damage. Materials 2020, 13, 4238 .
AMA StyleJeongJun Park, Gigwon Hong. Strength Characteristics of Controlled Low-Strength Materials with Waste Paper Sludge Ash (WPSA) for Prevention of Sewage Pipe Damage. Materials. 2020; 13 (19):4238.
Chicago/Turabian StyleJeongJun Park; Gigwon Hong. 2020. "Strength Characteristics of Controlled Low-Strength Materials with Waste Paper Sludge Ash (WPSA) for Prevention of Sewage Pipe Damage." Materials 13, no. 19: 4238.
This study described a ground reinforcement effect of a concrete mat, in order to apply a concrete mat for ground subsidence restoration of an open cut. A concrete mat can prevent the expansion of a cavity and relaxation area underground due to buried pipe damage when the buried pipe is in use. An experimental study was conducted to analyze the stress distribution characteristics of an underground area by ground reinforcement of a concrete mat. In addition, a numerical analysis was performed to estimate the range of underground reinforcement of a concrete mat. As an experiment results, the maximum stress reduction ratio of the concrete mat in the underground was 28.5% to 30.9%, which means the reinforcement effect of the concrete mat, according to the installation depth of the concrete mat. The finite element analysis (FEA) results showed that the installation depth of the concrete mat differed in various scenarios, in order to secure the reinforcement effect of the concrete mat according to the load conditions (point and uniform load). Therefore, the reinforced depth of a concrete mat should be determined by the load type on the surface.
JeongJun Park; Yoonseok Chung; Gigwon Hong. Reinforcement Effect of a Concrete Mat to Prevent Ground Collapses Due to Buried Pipe Damage. Applied Sciences 2020, 10, 5439 .
AMA StyleJeongJun Park, Yoonseok Chung, Gigwon Hong. Reinforcement Effect of a Concrete Mat to Prevent Ground Collapses Due to Buried Pipe Damage. Applied Sciences. 2020; 10 (16):5439.
Chicago/Turabian StyleJeongJun Park; Yoonseok Chung; Gigwon Hong. 2020. "Reinforcement Effect of a Concrete Mat to Prevent Ground Collapses Due to Buried Pipe Damage." Applied Sciences 10, no. 16: 5439.
This study described the results of experiments comparing the cavity scales obtained from the GPR exploration with the direct excavation of the identified cavity scales. The first experiment was carried out on the actual roadway, and the additional experiment was carried out on the mock-up site to prevent the cavity collapse under the ground. It was confirmed that the soil depth of the predicted cavity and the identified cavity was similar, but the predicted cavity scales by GPR exploration overestimated the longitudinal and cross-sectional widths compared with the identified cavity scales. Based on the correlation between the cavity scales predicted by GPR exploration and the cavity scales identified in the mock-up test, an empirical formula for estimating the cavity scales was proposed.
Jeong-Jun Park; Yoonseok Chung; Gigwon Hong. A Method for Cavity Scale Estimation Based on Ground-Penetrating Radar (GPR) Explorations: An Experimental Study. Advances in Civil Engineering 2019, 2019, 1 -13.
AMA StyleJeong-Jun Park, Yoonseok Chung, Gigwon Hong. A Method for Cavity Scale Estimation Based on Ground-Penetrating Radar (GPR) Explorations: An Experimental Study. Advances in Civil Engineering. 2019; 2019 ():1-13.
Chicago/Turabian StyleJeong-Jun Park; Yoonseok Chung; Gigwon Hong. 2019. "A Method for Cavity Scale Estimation Based on Ground-Penetrating Radar (GPR) Explorations: An Experimental Study." Advances in Civil Engineering 2019, no. : 1-13.
This study analyzed the dynamic behavior of flexible retaining walls constructed with geotextile bags. The behavior of geotextile bag retaining wall system was simulated using a large-scale shaking table in which 1 \(g_{n}\) of one-directional dynamic load was applied. The dynamic behavior of the retaining wall was analyzed with simulated ground consisting of a geotextile bag in which 0.154–0.44 \(g_{n}\) of ground acceleration was applied using historic and artificial seismic waves by El-Centro and Hachinohe. Dynamic characteristics of the geotextile bag retaining wall structure in response to acceleration, displacement, and earth pressure were also analyzed based on results of large-scale shaking table test and numerical analysis with the finite element method. Results showed that the dynamic active earth pressure increased with increasing ground acceleration at an action point of 0.6 \(H\). In addition, the higher the point of passive positive earth pressure and the lower the increment of active positive earth pressure, the more gradual the slope of the geotextile bag retaining wall.
Eun Chul Shin; Hee Soo Shin; Jeong Jun Park. Numerical simulation and shaking table test of geotextile bag retaining wall structure. Environmental Earth Sciences 2019, 78, 1 -17.
AMA StyleEun Chul Shin, Hee Soo Shin, Jeong Jun Park. Numerical simulation and shaking table test of geotextile bag retaining wall structure. Environmental Earth Sciences. 2019; 78 (16):1-17.
Chicago/Turabian StyleEun Chul Shin; Hee Soo Shin; Jeong Jun Park. 2019. "Numerical simulation and shaking table test of geotextile bag retaining wall structure." Environmental Earth Sciences 78, no. 16: 1-17.
To establish a standard for geocell reinforcement techniques, the aim of this paper was to analyze reinforcement efficiency and behavior as geocell dimensions and filling materials. Based on the result, the reinforcement of bearing capacity and stress distribution effect of the subgrade soil according to the increase of loading was analyzed in terms of the height, width, and shape of the geocell, as well as the types of filling materials. An evaluation of the bearing capacity based on a large-scale model test suggested that, with the maximum reinforcement, the ultimate bearing capacity increases by four to eight times in comparison to non-reinforced ground, while the largest ultimate bearing capacity is shown in 1:1.2 (width: height) when the geocell shape is filled with gravel and in 1:0.8 (width: height) when filled with weathered granite soil. Also, in reinforced ground, the maximum earth pressure decreases by 50% to 60% in comparison to unreinforced ground, due to the distribution of the lower stress due to the shallow foundation of the geocellreinforced layer.
Eun Chul Shin; Hyoun Hoi Kang; Jeong Jun Park. Reinforcement efficiency of bearing capacity with geocell shape and filling materials. KSCE Journal of Civil Engineering 2016, 21, 1648 -1656.
AMA StyleEun Chul Shin, Hyoun Hoi Kang, Jeong Jun Park. Reinforcement efficiency of bearing capacity with geocell shape and filling materials. KSCE Journal of Civil Engineering. 2016; 21 (5):1648-1656.
Chicago/Turabian StyleEun Chul Shin; Hyoun Hoi Kang; Jeong Jun Park. 2016. "Reinforcement efficiency of bearing capacity with geocell shape and filling materials." KSCE Journal of Civil Engineering 21, no. 5: 1648-1656.
The stacked geotextile structure is being increased as a structure for protecting beach line and as a structure for the purpose of solving environmental problem as well a dike. Three types of the geotextile tube were proposed to satisfy the desired crest height, structure for is being increased as a stand their stability against external forces was analyzed at each of the cross sections of the stacked geotextile tubes. The considered external forces were wave force, tidal force and lateral earth pressure by reclamation. Also, various field monitoring instrumentations (strain gauge, earth pressure cell, pore pressure measurement, inclinometer) were installed at a representative geotextile tube section. The behavior of a stacked geotextile tube was analyzed using field monitoring results, such as the tube structure settlement, the vertical soil pressure at the bottom of the tube, the lateral earth pressure, the surface strain of the geotextile tube, during and after construction. The analysis results showed that the stacked geotextile tube had external and internal stability. The seepage analysis showed that ground seepage was steady during monitoring. Therefore, when a temporary dike structure with a filling material is constructed, not only should its structural stability be considered, but also its height reduction due to settlement by low - pressure filling, scouring by high-velocity tides, and fine material loss by water flow. In this study, the experimental results of the behavior of stacked geotextile tubes are confirmed using a numerical method. Thus, by analyzing the behavior of stacked geotextile tubes at a coastal area by a numerical method such as FLAC, we can improve the geotextile tube technology for safe construction of structures at a shore.
Eun Chul Shin; Jeong Ku Kang; Sung Hwan Kim; Jeong Jun Park. Construction technology of environmental sustainable shore and harbor structures using stacked geotextile tube. KSCE Journal of Civil Engineering 2015, 20, 2095 -2102.
AMA StyleEun Chul Shin, Jeong Ku Kang, Sung Hwan Kim, Jeong Jun Park. Construction technology of environmental sustainable shore and harbor structures using stacked geotextile tube. KSCE Journal of Civil Engineering. 2015; 20 (6):2095-2102.
Chicago/Turabian StyleEun Chul Shin; Jeong Ku Kang; Sung Hwan Kim; Jeong Jun Park. 2015. "Construction technology of environmental sustainable shore and harbor structures using stacked geotextile tube." KSCE Journal of Civil Engineering 20, no. 6: 2095-2102.