Finite Element Analysis for Investigating the Behavior of Gravel Compaction Pile Composite Ground

IF 0.4 Q4 ENGINEERING, GEOLOGICAL 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
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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%.
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碎石压实桩复合地基性能的有限元分析
目前砾石压实桩(GCP)方法的设计和施工采用经验方法,因为定量设计方法尚未发展,导致膨胀破坏、剪切破坏等破坏类型多样、频繁发生,难以明确原因,制定防止破坏的措施。此外,尽管与国内施工设备、材料特性存在差异,但国外地基的方法在国内是照搬的,导致承载力、沉降量等变量的应用值与实测值存在显著差异。因此,本研究的目的是通过分析国内粘土地基在GCP法下根据地基强度变化产生的沉降和应力行为特征,提出一种合理、安全的GCP法设计方法。利用ABAQUS软件对复合地基沉降量、应力集中比、最大水平位移及GCP的预期位置进行分析。分析结果表明,在置换率为30%及以上时,复合地基的沉降和沉降减减率下降幅度均在60%以上,GCP的最大水平位移出现在2.6倍桩径处,置换率为30%时,水平位移差异不大。
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