基于FLAC3D的软土路基动力响应分析  

DYNAMIC RESPONSE ANALYSIS OF SOFT SOIL SUBGRADE BASED ON FLAC3D

作　　者：李冰 LI Bing(Fuyang Transportation Comprehensive Administrative Law Enforcement Detachment,Anhui Fuyang 236000,China)

机构地区：[1]阜阳市交通运输综合行政执法支队,安徽阜阳236000

出　　处：《低温建筑技术》2023年第3期129-132,共4页Low Temperature Architecture Technology

摘　　要：为了解饱和未加固软土路基在不同振动荷载加载方式向下的动力响应,针对典型公路路堤标准横断面的3层土地基模型,利用有限差分法软件FLAC3D,对可液化路堤地震作用下的液化进程以及路堤边坡和路面变形的过程进行数值模拟和数值计算.计算结果表明仅在水平地震荷载分量的作用下,路基的水平位移值与竖直沉降值与双向地震荷载同时作用时略有差距,液化区域和有效应力变化时程曲线也不相同,竖向地震荷载分量单独作用时对路基扰动不大,但是双向地震荷载同时作用时对路基的扰动与前者不同.研究结果可为软件模型计算和振动台实验时仅考虑水平振动荷载作用下的研究结果和真实的双向振动荷载作用下结果提供一定的参考和进行近似处理的依据.In order to understand the downward dynamic response of saturated and unstrengthened soft soil subgrade under different vibration loading modes,the liquefaction and ground deformation process of liquefiable site under earthquake action are numerically simulated using the finite difference method FLAC3D for a typical three-layer soil foundation model of subgrade site.The results show that the horizontal displacement and the vertical settlement of the subgrade are slightly difference with the action of the horizontal seismic load,and the liquefaction area and the effective stress change curve is not the same compared with the bidirectional seismic load.The disturbance to subgrade is small when the vertical seismic load is acting alone,but the disturbance to the subgrade under the simultaneous action of two-way seismic load is different from the former.The research results may provide the reference and basis for approximate treatment for software model calculation and shaking table test when only considering the research results under horizontal vibration load and the results under real two-way vibration load.

关 键 词：数值模拟 振动荷载 流固耦合 场地液化 路基变形 

分 类 号：TU470[建筑科学—结构工程]