振动作用下碎石桩复合地基渗流理论分析与物理模拟

doi:10.11779/CJGE202009019

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摘要碎石桩技术是常用的抗液化处理措施之一。在地震荷载作用时,由于桩体材料比桩间土渗透性更高,能够加快地基土体超静孔压的消散从而部分或完全消除地基的液化可能性。首先将单根碎石桩及其影响范围的地基土当做一个表征体元,将碎石桩影响边界处的孔压作为已知条件,基于已有解析解推导了碎石桩复合地基竖向和水平向渗流的计算表达式。并开展了一组碎石桩处理地基超重力振动台模型试验,用提出的碎石桩复合地基径竖向渗流解得到总渗流量,并基于地基土体的体积守恒关系得到计算沉降值,与试验结果吻合,从而验证了提出的碎石桩复合地基渗流计算公式的正确性。进一步基于所推导的渗流计算表达式,分析了本次超重力振动台模型试验碎石桩复合地基水平向和竖向渗流演化规律。

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	刘凯
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关键词 ：碎石桩复合地基, 振动荷载, 解析解, 渗流排水, 超重力模型试验

Abstract：The stone column technique is one of the liquefaction mitigation methods used in liquefiable deposite. Owing to the higher permeability of stone column materials than that of the surrounding soil, the stone columns may expedite the drainage process of the excess pore pressure under seismic loading so that to partly or completely eliminate the triggering of liquefaction. One stone column with the influenced surrounding soil is treated as a representative element, and based on the previous analytical solution to this problem, the analytical solutions for vertical and radical drainages are obtained by considering the excess pore water pressure on the boundary of single stone column-influenced area as the known condition. The centrifugal model tests on stone column-improved ground are carried out. The total drainage water in the centrifuge model improved by stone columns is calculated using the above analytical solution, and is further converted into the settlement based on the equivalent relationship between the seepage discharge and the volumetric change of the surrounding soil. The calculated settlement is found to be in good agreement with the measured one in experiment, which verifies the proposed solution. Furthermore, the evolution of horizontal and vertical drainages of stone column composite deposite in the model tests is analyzed by combining the derived analytical solutions for water drainage with the test results.

Key words： stone column-improved ground shaking loading analytical solution water drainage hypergravity physical modeling

收稿日期: 2019-11-18

ZTFLH:	TU435;TU411

基金资助:国家自然科学基金项目（51988101, 51578501,51778573,51978613）; 高等学校学科创新引智计划项目（B18047）

通讯作者: *（E-mail: qzking@zju.edu.cn）

作者简介: 刘凯(1993— ),男,博士研究生,主要从事土动力学与地震工程方面的研究工作。E-mail: 11612027@zju.edu.cn。

引用本文:

刘凯, 周燕国, 孙政波, 陈云敏. 振动作用下碎石桩复合地基渗流理论分析与物理模拟[J]. 岩土工程学报, 2020, 42(9): 1742-1750. LIU Kai, ZHOU Yan-guo, SUN Zheng-bo, CHEN Yun-min. Theoretical analysis and physical modeling of stone columns-improved ground under shaking loading. Chinese J. Geot. Eng., 2020, 42(9): 1742-1750.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE202009019 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2020/V42/I9/1742

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