基于位移信息的均质土坡动态稳定性分析

摘要

On-site displacement monitoring is a visual method to get displacement information of slope body,and can not be used to determine the dynamic stability thereof.Hence,the numerical calculation model for typical homogeneous soil slope was established herein depending on Mohr-Coulomb model built in FLAC3D to simulate the whole course of slope deformation development by means of strength reduction,and then to find out the deformation evolution law of homogeneous soil slope in the course of instability.Furthermore,according to the displacement variation period of key points,the deformation was divided into three stages,i.e.uniform,accelerated and severe deformation stage.Finally,the characteristics in each stage was analyzed from the displacement variation pattern of key point and spacial displacement feature,and the dynamic stability of slope was evaluated.%现场位移监测是获得边坡体位移信息的直观手段,但据此不能判断边坡的动态稳定性.为此,基于FLAC3D内置的摩尔-库伦模型,建立典型均质土坡的数值计算模型,采用强度折减法模拟边坡变形发展的全过程,获得均质土坡失稳过程中的变形演化规律,并根据关键点的位移变化过程划分为三个阶段,即匀速变形,加速变形和剧烈变形阶段.最后,从关键点位移变化形态以及空间位移特征分析各变形阶段的特点,进行边坡动态稳定性评价.