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Journal of the Korean Geosynthetic Society最新文献

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Finite Element Analysis for Investigating the Behavior of Gravel Compaction Pile Composite Ground 碎石压实桩复合地基性能的有限元分析
IF 0.5
Journal of the Korean Geosynthetic Society Pub Date : 2018-01-01 DOI: 10.12814/JKGSS.2018.17.3.019
Kim Gyeong Eop, Kyungho Park, Kim ho yeoun, Daehyeon Kim
{"title":"Finite Element Analysis for Investigating the Behavior of Gravel Compaction Pile Composite Ground","authors":"Kim Gyeong Eop, Kyungho Park, Kim ho yeoun, Daehyeon Kim","doi":"10.12814/JKGSS.2018.17.3.019","DOIUrl":"https://doi.org/10.12814/JKGSS.2018.17.3.019","url":null,"abstract":"Gravel Compaction Pile (GCP) method is currently being designed and constructed by empirical method because quantitative design method has not been developed, leading to various types of and frequent destruction such as expansion failure and shear failure and difficulties in establishing clear cause and developing measure to prevent destruction. In addition, despite the difference with domestic construction equipment and material characteristics, the methods applied to the overseas ground is applied to the domestic as it is, leading to remarkable difference between applied values and measured values in variables such as bearing capacity and the settlement amount. The purpose of this study was, therefore, to propose a reasonable and safe design method of GCP method by analyzing the settlement and stress behavior characteristics according to ground strength change under GCP method applied to domestic clay ground. For the purpose, settlement amount of composite ground, stress concentration ratio, and maximum horizontal displacement and expected location of GCP were analyzed using ABAQUS. The results of analysis showed that the settlement and Settlement reduction rate of composite ground decreased by more than 60% under replacement ratio of 30% or more, that the maximum horizontal displacement of GCP occurred at the depth 2.6 times pile diameter, and that the difference in horizontal displacement is slight under replacement ratio of 30%.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73506902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Discharge Capacity of Prefabricated Vertical Drain Confined In-Clay Under Long-Term Conditions 粘土内预制垂直排水管长期排水能力研究
IF 0.5
Journal of the Korean Geosynthetic Society Pub Date : 2018-01-01 DOI: 10.12814/JKGSS.2018.17.4.239
Sangguk Jeong
{"title":"Discharge Capacity of Prefabricated Vertical Drain Confined In-Clay Under Long-Term Conditions","authors":"Sangguk Jeong","doi":"10.12814/JKGSS.2018.17.4.239","DOIUrl":"https://doi.org/10.12814/JKGSS.2018.17.4.239","url":null,"abstract":"Typically, soft clay improvement is carried out using installation of PVD and surcharge method. According to circumstances, installed PVD has left for a long time due to the change in construction schedule. Therefore, for simulation of this kind of condition, discharge capacity tests were carried out under a series of temperature condition (30, 35, 40°C). The results indicated that under water confinement, the discharge capacities significantly reduced with elapsed time. And, the empirical equation by Miura and Chai (2000) was used for estimating the long-term in-clay discharge capacity. Based on the test results, it is recommended that in term of long-term discharge capacity, Miura and Chai’s equation and reliability evaluation using discharge capacity tests under a series of temperature condition may be used.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74951093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical Analysis of Behavior of Ground Near LNG Tank Foundation Under Scenario of LNG Leakage LNG泄漏情况下LNG储罐基础附近地基性能的数值分析
IF 0.5
Journal of the Korean Geosynthetic Society Pub Date : 2018-01-01 DOI: 10.12814/JKGSS.2018.17.4.081
Kim, Jeongsoo, Young-Seog Kim, Kicheol Lee, Dongwook Kim
{"title":"Numerical Analysis of Behavior of Ground Near LNG Tank Foundation Under Scenario of LNG Leakage","authors":"Kim, Jeongsoo, Young-Seog Kim, Kicheol Lee, Dongwook Kim","doi":"10.12814/JKGSS.2018.17.4.081","DOIUrl":"https://doi.org/10.12814/JKGSS.2018.17.4.081","url":null,"abstract":"","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74047600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Study on the Frictional Resistance Chracteristics of Pressurized Soil Nailing Using Rapid Setting Cement 快凝水泥压土钉的摩擦阻力特性研究
IF 0.5
Journal of the Korean Geosynthetic Society Pub Date : 2018-01-01 DOI: 10.12814/JKGSS.2018.17.4.001
Arum Lee, E. Shin, Chul-Hee Lee, Y. Rim
{"title":"A Study on the Frictional Resistance Chracteristics of Pressurized Soil Nailing Using Rapid Setting Cement","authors":"Arum Lee, E. Shin, Chul-Hee Lee, Y. Rim","doi":"10.12814/JKGSS.2018.17.4.001","DOIUrl":"https://doi.org/10.12814/JKGSS.2018.17.4.001","url":null,"abstract":"Although the soil nailing method is generally used as a gravity grouting, the development and application of pressurized grouting method has recently increased to address the problem of joint generation and filling due to grouting. Pressurized grouting of the soil nailing method is generally used in combination with ordinary portland cement and water. In the field, the cement is mixed with the rapid setting cement to reduce curing time because ordinary portland cement takes more than 10 days to satisfy the required strength. In this study, uniaxial compression tests and laboratory tests were carried out to confirm the efficiency of the grouting material according to the mixing ratio of rapid setting cement. The mixing ratio of 30% grouting satisfies the required strength within 7 days and satisfies the optimum gel time. As a result of the laboratory test with granite weathered soil, the reinforcing effect was confirmed to be 1.5 times as compared with the gravity type at an injection time of 10 seconds and a strain of 15%. The friction resistance increases linearly with the increase of the injection time, but it is confirmed that the friction resistance decreases due to the hydraulic fracturing effect at the injection time exceeding the limit injection pressure. Numerical analysis was performed to compare the stability of slopes not reinforced with slopes reinforced with gravity and pressurized soil nailing.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75884818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Slope Behavior Analysis Using the Measurement of GFRP Underground Displacement 基于GFRP地下位移测量的边坡特性分析
IF 0.5
Journal of the Korean Geosynthetic Society Pub Date : 2018-01-01 DOI: 10.12814/JKGSS.2018.17.4.011
Jihuan Jin, Hyuntaek Lim, Tamang, Bibek, Sukhyun Chang, Kim Yongseong
{"title":"Slope Behavior Analysis Using the Measurement of GFRP Underground Displacement","authors":"Jihuan Jin, Hyuntaek Lim, Tamang, Bibek, Sukhyun Chang, Kim Yongseong","doi":"10.12814/JKGSS.2018.17.4.011","DOIUrl":"https://doi.org/10.12814/JKGSS.2018.17.4.011","url":null,"abstract":"Although many researches related to monitoring and automatic measuring devices for early warning system during slope failure have been carried out in Korea and aboard, most of the researches have installed measuring devices on the slope surface, and there are only few researches about warning systems that can detect and warn before slope failure and disaster occurs. In this study, slope failure simulation experiment was performed by attaching sensors to rock bolts, and initial slope behavior characteristics during slope failure were analyzed. Also, the experiment results were compared and reviewed with varied slope conditions, i.e. shotcrete slope and natural slope, and varied material conditions, i.e. GFRP and steel rock bolt. This study can be used as a basic data in development of warning and alarm system for early evacuation through early detection and warning before slope failure occurs in steep slopes and slope failure vulnerable areas.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72414249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Experimental Study on Enhanced Structural Properties of Sprayable Waterproofing Membrane 增强可喷涂防水膜结构性能的试验研究
IF 0.5
Journal of the Korean Geosynthetic Society Pub Date : 2018-01-01 DOI: 10.12814/JKGSS.2018.17.4.093
Chulho Lee, Jintae Kim, Myung-Sik Choi, Jun-Hee Chang, T. Kang, Soon-Wook Choi
{"title":"Experimental Study on Enhanced Structural Properties of Sprayable Waterproofing Membrane","authors":"Chulho Lee, Jintae Kim, Myung-Sik Choi, Jun-Hee Chang, T. Kang, Soon-Wook Choi","doi":"10.12814/JKGSS.2018.17.4.093","DOIUrl":"https://doi.org/10.12814/JKGSS.2018.17.4.093","url":null,"abstract":"A sprayable waterproofing membrane which is composed of polymer-based material is relatively easy to install due to its construction method comparing with sheet-type membranes. And a sprayable waterproofing membrane has very similar material composition to the TSL which is for a permanent support. In this study, material composition of the sprayable waterproofing membrane was changed to enhance structural properties of membrane while maintaining waterproofing performance. In order to compare with a previous research for the TSL, series of tests were performed according to the performance criteria used for permanent support material (TSL) by EFNARC (2008). From the test result, the structural performance of the sprayable waterproofing membrane considered in this study showed a performance that could be used as a permanent support material.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76380748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical Study on Medium-Diameter EPB Shield TBM by Discrete Element Method 中径EPB盾构掘进机离散元法数值研究
IF 0.5
Journal of the Korean Geosynthetic Society Pub Date : 2018-01-01 DOI: 10.12814/jkgss.2018.17.4.129
Soon-Ju Choi, Byungkwan Park, T. Kang, Soo-Ho Chang, Chulho Lee
{"title":"Numerical Study on Medium-Diameter EPB Shield TBM by Discrete Element Method","authors":"Soon-Ju Choi, Byungkwan Park, T. Kang, Soo-Ho Chang, Chulho Lee","doi":"10.12814/jkgss.2018.17.4.129","DOIUrl":"https://doi.org/10.12814/jkgss.2018.17.4.129","url":null,"abstract":"The Discrete Element Method (DEM) has been widely used in granular material researches. Especially, if material has a large deformation, such as ground, it can be a useful method to analyze. In this study, to simulate ground formations, DEM was used. The main purpose of DEM analysis was to investigate the numerical model which can predict the TBM performance by simulating excavating procedure. The selected EPB TBM has a 7.73 m of diameter and six spokes. And two pre-defined excavation conditions with the different rotation speeds per minute (RPM) of the cutterhead was applied. In the modeled cutterhead, the open ratio of cutterhead was 21.31% and number of cutters (including disc cutter and cutter bit) was 219. From the results, reaction forces and resistant torques at the cutterhead face and cutting tools, were measured and compared. Additionally the muck discharge rate and accumulated muck discharge by the screw auger were evaluated.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90648099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Study on the Crack and Thermal Degradation of GFRP for UPE Gelcoat Coated Underground Pipes Under the High Temperature Water-Immersion Environment 高温浸水环境下UPE涂胶地下管道用GFRP开裂及热降解研究
IF 0.5
Journal of the Korean Geosynthetic Society Pub Date : 2018-01-01 DOI: 10.12814/JKGSS.2018.17.4.169
Daehoon Kim, J. Eom, Youngjong Ko, Lee, Kang-il
{"title":"Study on the Crack and Thermal Degradation of GFRP for UPE Gelcoat Coated Underground Pipes Under the High Temperature Water-Immersion Environment","authors":"Daehoon Kim, J. Eom, Youngjong Ko, Lee, Kang-il","doi":"10.12814/JKGSS.2018.17.4.169","DOIUrl":"https://doi.org/10.12814/JKGSS.2018.17.4.169","url":null,"abstract":"Glass fiber reinforced polyester (GFRP) composites are widely used as structural materials in harsh environment such as underground pipes, tanks and boat hulls, which requires long-term water resistance. Especially, these materials might be damaged due to delamination between gelcoat and composites through an osmotic process when they are immersed in water. In this study, GFRP laminates were prepared by surface treatment of UPE (unsaturated polyester) gelcoat by vacuum infusion process to improve the durability of composite materials used in underground pipes. The composite surface coated with gelcoat was examined for surface defects, cracking, and hardness change characteristics in water-immersion environments (different temperatures of 60°C, 75°C, and 85°C). The penetration depth of cracks was investigated by micro CT imaging according to water immersion temperature. It was confirmed that cracks developed into the composites material at 75°C and 85°C causing loss of durability of the materials. The point at which the initial crack initiated was defined as the failure time and the life expectancy at 23°C was measured using the Arrhenius equation. The results from this study is expected to be applied to reliability evaluation of various industrial fields where gelcoat is applied such as civil engineering, construction, and marine industry.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80165598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Analysis of Sewer Pipe Defect and Ground Subsidence Risk by Using CCTV and GPR Monitering Results 利用闭路电视和探地雷达监测结果分析污水管道缺陷及地面沉降风险
IF 0.5
Journal of the Korean Geosynthetic Society Pub Date : 2018-01-01 DOI: 10.12814/JKGSS.2018.17.3.047
D. Lee
{"title":"Analysis of Sewer Pipe Defect and Ground Subsidence Risk by Using CCTV and GPR Monitering Results","authors":"D. Lee","doi":"10.12814/JKGSS.2018.17.3.047","DOIUrl":"https://doi.org/10.12814/JKGSS.2018.17.3.047","url":null,"abstract":"Recently, increasing number of urban ground subsidence occurrences has been identified. This situation is mainly due to the increased number of underground cavities. This study is intended to develop the method that prevents ground settlement caused by deteriorated or damaged sewers, which are the main cause of land subsidence. To that end, GPR exploration was conducted using CCTV monitoring of deteriorated sewer at the location with high settlement potential. Through such CCTV monitoring and GPR investigation, abnormal ground behavior was monitored at the site where sewer was damaged, joint was cracked and soil was deposited. According to site investigation in this study, evaluation method using correlation analysis of CCTV monitoring and GPR investigation results is expected to prevent ground settlement attributable to damaged sewer.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84281178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Evaluation of Seismic Fragility of Concrete Faced Rockfill Dam 面板堆石坝地震易损性评价
IF 0.5
Journal of the Korean Geosynthetic Society Pub Date : 2018-01-01 DOI: 10.12814/JKGSS.2018.17.4.103
Jongmin Baeg, Duhee Park, Jinam Yoon, B. Choi
{"title":"Evaluation of Seismic Fragility of Concrete Faced Rockfill Dam","authors":"Jongmin Baeg, Duhee Park, Jinam Yoon, B. Choi","doi":"10.12814/JKGSS.2018.17.4.103","DOIUrl":"https://doi.org/10.12814/JKGSS.2018.17.4.103","url":null,"abstract":"The fragility curves for CFRD dams are derived in this study for probabilistic damage estimation as a function of a ground motion intensity. The dam crest settlement, which is a widely used damage index, is used for minor, moderate, and extensive damage states. The settlement is calculated from nonlinear dynamic numerical simulations. The accuracy of the numerical model is validated through comparison with a centrifuge test. The fragility curve is represented as a log normal distribution function and presented as a function of the peak ground acceleration. The fragility curves developed in this study can be utilized for real time assessment of the damage of dams.","PeriodicalId":42164,"journal":{"name":"Journal of the Korean Geosynthetic Society","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74144095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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