地基液化导致沉箱码头破坏及地基加固方法的非线性数值分析  

Nonlinear Numerical Analysis of Caisson Quay Failure Due to Soil Liquefaction and of Soil Strengthening Method

作　　者：刘晓[1,2,3] 唐小微[1,2] 栾茂田[1,2] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116085 [2]大连理工大学土木水利学院岩土工程研究所,辽宁大连116085 [3]国核工程有限公司,上海200233

出　　处：《防灾减灾工程学报》2009年第5期518-523,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(50779003和50639010);辽宁省自然科学基金项目(20071085)资助

摘　　要：地震作用引发的地基液化,往往导致沉箱基础的破坏。本文基于Biot两相饱和多孔介质动力耦合理论,采用FE-FD耦合数值分析方法,对液化海床沉箱基础的地震反应进行非线性有效应力分析。在数值分析过程中,建立了以土骨架位移和超静孔隙水压力表达的us-pw动力固结方程和循环弹塑性本构模型,该方法能够很好地模拟地震作用下沉箱码头的动力特性及液化破坏的影响。通过数值模拟计算,分析了采用碎石桩进行置换砂区域的防液化加固方法,并就碎石桩处理区域的选择提出了建议。The soil liquefaction due to earthquakes will usually result in the damage of caisson foundation. Based on the Blot＇s dynamic consolidation theory for two-phase media, a coupled FE-FD method is used in this paper to analyze the effective pore water pressure in liquefied seabed caisson foundation. In the numerical analysis, us-pw formulation of dynamic consolidation equation and cyclic elastic-plastic constitutive model is used, and the analytic results have shown that the method performs well in simulating the seabed liquefaction process. The strengthening method to prevent the liquefaction of sand zones by gravel piles was analyzed with the numerical method to suggest how to select the sand zones treated by gravel piles.

关 键 词：地基液化 沉箱基础 循环弹塑性模型 动力耦合分析 碎石桩处理 

分 类 号：TU441.6[建筑科学—岩土工程]