土工格栅包裹碎石桩力学特性数值模拟分析  

Numerical Simulation Analysis of Mechanical Properties of Geosyntheic Encased Rock Columns

作　　者：王家全[1] 常志凯 林志南 黄世斌[1] WANG Jia-quan;CHANG Zhi-kai;LIN Zhi-nan;HUANG Shi-bin(College of Civil and Architectural Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China)

机构地区：[1]广西科技大学土木建筑工程学院,柳州市545006

出　　处：《公路》2021年第8期7-12,共6页Highway

基　　金：国家自然科学基金资助项目,项目编号41962017;广西自然科学基金资助项目,项目编号2017GXNSFAA198170;广西高等学校高水平创新团队及卓越学者计划项目,桂教人才〔2020〕6号;广西研究生教育创新计划项目,项目编号YCSW2020222;广西大学生创新创业训练计划项目,项目编号202010594037。

摘　　要：为了研究加筋包裹碎石桩中土工格栅和碎石的力学参数对桩体承载性能的影响程度,基于室内试验建立ABAQUS三维有限元计算模型,分析碎石内摩擦角、碎石弹性模量和土工格栅弹性模量对桩体承载力、桩身侧向变形和桩土应力比的影响,探讨分析了3个参数提高桩体承载性能的作用机理。结果表明:碎石内摩擦角对加筋包裹碎石桩的桩体承载力的敏感度最高,碎石弹性模量对桩土应力比的敏感度最高,土工格栅弹性模量对桩身最大侧向变形的敏感度最高;碎石内摩擦角、土工格栅弹性模量、碎石弹性模量对于桩体承载性能的影响分别主要表现为提高桩体承载力、减小桩身侧向变形,以及提高桩土应力比、增强桩身荷载传递性能。In order to study the influence of the mechanical parameters of the geogrid and the gravel in the reinforced encased gravel pile on the bearing performance of the pile,the ABAQUS three-dimensional finite element calculation model is established based on laboratory experiments to analyze the influence of internal friction angle of the gravel,the elastic modulus of the gravel and the elastic modulus of geogrid on the bearing capacity of the pile body,the lateral deformation of the pile and the pile-soil stress ratio,and the mechanism of the three parameters improving the bearing performance of the pile is discussed and analyzed.The results indicate that the sensitivity of the bearing capacity of the pile body to the internal friction angle of the crushed stone is the highest,the load transfer performance of the pile body to the elastic modulus of the crushed stone is the highest,and the maximum lateral deformation of the pile body to the elastic modulus of the geogrid is the highest.The influence of internal friction angle of gravel,geogrid elastic modulus and gravel elastic modulus on the bearing capacity of pile body is mainly manifested in improving the bearing capacity of pile body,reducing the lateral deformation of pile body and increasing the stress ratio of pile and soil to enhance the load transfer performance of pile body.

关 键 词：加筋包裹碎石桩 敏感度 桩体承载力 桩土应力比 桩身变形 

分 类 号：U416.1[交通运输工程—道路与铁道工程]