基于Finn本构模型的饱和砂土地震液化分析  

Seismic liquefaction analysis of saturated sand soil based on Finn constitutive model

作　　者：王根龙[1,2] 林玮[1] 蔡晓光[1,3] 

机构地区：[1]防灾科技学院,河北三河065201 [2]中国科学院地质与地球物理研究所,北京100029 [3]中国地震局工程力学研究所,黑龙江哈尔滨150080

出　　处：《地震工程与工程振动》2010年第3期178-184,共7页Earthquake Engineering and Engineering Dynamics

基　　金：中国博士后科学基金(20090450565);防灾减灾青年科技基金项目(2008A10)

摘　　要：天然地震作用下的饱和砂土液化问题是岩土地震工程研究的重要课题之一。目前,国内推荐使用的规范法是基于实际地震液化调查而建立的判别方法,方法本身缺乏理论基础。采用Finn液化本构关系建立了砂土液化数值分析模型,运用有限差分法的动力时程分析模块,分析了饱和砂土地基的地震液化问题。结果表明,将Finn本构模型应用于砂土液化分析,可以较好地给出地震作用过程中孔隙水压力和有效应力变化的规律。Sand liquefaction caused by natural earthquake is a very important subject in the research area of geotechnical earthquake engineering.At the present time the method recommended in code which is based on practical liquefaction investigation and devoid of theoretical foundation.The numerical simulation model for sand liquefaction is established by using Finn constitutive relation;furthermore,the earthquake liquefaction problem in sand soil foundation is analyzed by finite difference method.The results show Finn constitutive model applied to sand liquefaction analysis can set better regular patterns for pore water pressure and effective stress caused by an earthquake.

关 键 词：砂土液化 地震 Finn本构模型 有效应力 孔隙水压力 

分 类 号：P315.98[天文地球—地震学]