地下水位变化对桩—土—结构地震动力相互作用影响的有限元—无限元耦合分析  

Finite-infinite Element Analysis of Seismic Pile-soil-structure System Considering Change of Groundwater Level

作　　者：胡伟[1] 卫宏[1] 肖天崟[1] 

机构地区：[1]海南大学土木建筑工程学院,海口570228

出　　处：《土工基础》2009年第5期55-58,共4页Soil Engineering and Foundation

摘　　要：地下水位的抬高会显著降低土体内的有效应力、破坏其结构性,导致土体的力学性能降低;也意味着在地震时产生超孔隙水压力土体的范围会增加;同时水的润滑作用还会进一步削弱桩土界面的粘结作用。这些变化会显著改变桩土结构体系的动力反应特性。通过ABAQUS有限元程序建立了桩-土-结构体系的有限元-无限元耦合模型,研究了黄土地区地下水位变化对桩基体系动力特性的影响。The rise of groundwater level will reduce the effective stress of soil significantly and destroy soil＇s structure, which results in the degradation of soil＇s mechanical characteristics and the increasing of excess pore water pressure area during earthquake. At the same time, the lubrication of water will weaken the joint between pile and soil. As a result, the dynamic characteristics of pile soil structure system will be changed remarkably. The finite-infinite model of pile-soil-structure system is established by ABAQUS, and the influence of groundwater level on the dynamic characteristics of pile foundation system in loess area is studied.

关 键 词：地下水位高度 超孔隙水压力 桩-土-结构体系 有限元-无限元 动力相互作用 

分 类 号：TU455[建筑科学—岩土工程]