碎石桩加固砂土地基数值模拟  

Numerical simulation of gravel pile reinforcement for sandy soil foundation

作　　者：徐文栋 李学丰[2] 杨文伟[1,3] XU Wen-dong;LI Xue-feng;YANG Wen-wei(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,Ningxia,China;Solid Mechanics Institute,Ningxia University,Yinchuan 750021,Ningxia,China;Ningxia Center for Research on Earthquake Protection and Disaster Mitigation in Civil Engineering,Yinchuan 750021,Ningxia,China)

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]宁夏大学固体力学研究所,宁夏银川750021 [3]宁夏土木工程防震减灾工程技术研究中心,宁夏银川750021

出　　处：《地基处理》2022年第4期316-321,共6页Journal of Ground Improvement

基　　金：国家自然科学基金资助项目(1216020092);宁夏科技创新领军人才计划项目(KJT2019001)。

摘　　要：本文通过ABAQUS有限元数值模拟分析了天然地基与碎石桩复合地基在静力和地震动力荷载作用下的响应。计算结果表明,在地震荷载的作用下,地基顶部的水平向加速度相较于地基底部的水平向加速度较大,且在天然地基内,随着深度的降低其水平加速度极值逐渐增加。砂土模型采用修正剑桥模型计算出的碎石桩承载力为286.6 kN,采用Mohr-Coulomb模型计算出的碎石桩承载力为356.9 kN。碎石桩加固砂土地基的峰值加速度小于天然地基的峰值加速度,碎石桩加固的砂土地基可在一定程度上降低桩端土体的动剪应力,因此能够提高土体的抗液化强度。In this paper, the response of natural foundation and gravel pile composite foundation under static and earthquake dynamic loading was analyzed by ABAQUS finite element numerical simulation. The results show that the horizontal acceleration at the top of the foundation is larger than that at the bottom of the foundation under the earthquake loading.And in natural foundation, the extreme value of horizontal acceleration increases gradually with the decrease of depth. The bearing capacity of gravel pile is 286.6 kN by Modified Cambridge Model and 356.9 kN by Mohr-Coulomb Model. The peak acceleration of the sand foundation reinforced with gravel piles is smaller than that of the natural foundation. The sand foundation reinforced with gravel piles can reduce the dynamic shear stress of the soil at the pile end to a certain extent, so it can improve the liquefaction resistance of the soil.

关 键 词：碎石桩复合地基 砂土路基 数值模拟 等效线性模型 地震动力分析 

分 类 号：TU43[建筑科学—岩土工程]