近断层地震下可液化场地土反应的数值模拟  

Numerical simulation of seismic response of liquefiable site soils due to near-fault earthquakes

作　　者：张雪枫[1] 刘林[1] 杨庆山[1] 李英勇[2] 

机构地区：[1]北京交通大学土建学院,北京100044 [2]山东省交通厅公路局,山东济南250002

出　　处：《世界地震工程》2010年第S1期124-128,共5页World Earthquake Engineering

基　　金：国家自然科学基金项目(50938008);山东省交通科技计划项目(2009Y007)

摘　　要：液化条件下场地土大变形是造成工程结构失效的主要原因之一。文中以某高速公路特大桥的可液化岸坡近场场地为研究对象,基于PL-Finn液化本构模型,利用FLAC 3D程序对其在地震作用下的动响应全过程进行了数值模拟分析。结果表明,PL-Finn模型可较好地反映地震过程中孔隙水压、液化区的变化规律,并能较好的预测液化后场地土的变形规律。液化引起的地基土大变形对桥梁桩基的影响需引起重视。The large displacement of sandy soils due to seismic liquefaction is one of the main sources that induce the failure of engineering structures.The sloping site for a highway bridge at near-fault region is presented in this paper,and based on PL-Finn constitutive model,the process of the seismic response due to liquefaction is simulated by using FLAC 3D.The numerical simulations indicate that the PL-Finn model can better demonstrate the variation of the pore water pressure,the liquefied zone distribution and the large displacement of the liquefied site soils.Much attention needs to be paid for the effect of the large displacement of site soils due to the seismic liquefaction on the bridge pile foundations.

关 键 词：土动力学 砂土液化 孔隙水压力 数值模拟 地震反应 

分 类 号：TU435[建筑科学—岩土工程]