两级均质土坡位移场对边坡形态的敏感度分析

Sensitivity Analysis of the Displacement Field to Side Slope Shape of Two-Stage Ladder-Type Homogeneous Soil Slope

运用Abaqus有限元软件求解边坡位移场对边坡形态敏感度的方法,求解分析了两级阶梯型均质土坡在坡顶受40 k Pa均布荷载作用下,土坡位移场对一、二级边坡坡度变化与平台高度、宽度变化敏感度的分布规律。结果表明:两级阶梯型均质土坡水平位移场与竖向位移场对二级边坡坡度最敏感位置分别位于二级边坡潜在滑移体下部与边坡坡顶后方附近;对一级边坡坡度较敏感位置分别位于边坡平台后方附近、一级边坡潜在滑坡体下部与一级边坡潜在滑移体顶部、边坡坡顶后方;对边坡平台高度较敏感位置分别位于一、二级边坡潜在滑移体下部与边坡平台下方、一级边坡坡面附近;对边坡平台宽度较敏感位置分别位于二级边坡潜在滑移体下部与边坡坡肩附近。归一化敏感度显示在4个边坡形态因素中,边坡平台高度对边坡位移场影响最大,一级边坡坡度对其影响最小。

The method by the Abaqus finite element software was introduced for the sensitivity analysis of the displacement field to slope, and the sensitivity of the displacement field to side slope shape of two-stage ladder-type homogeneous soil slope with serf-weight stress and slope top acted by uniform load 40 kPa was calculated and analyzed. The most sensitive soil is located near the bottom of potential landslide mass of the secondary slope for the horizontal displacement field and near the top rear slope for the vertical displacement field to the slope degree of secondary slope. The more sensitive soil is located near the behind slope platform and the bottom of potential landslide mass of the first slope for the horizontal displacement field and near the behind slope top and the top of potential landslide mass of the first slope for the vertical displacement field to the slope degree of first slope. The more sensitive soil is located near the bottom of potential landslide mass of the first and secondary slope for the horizontal displacement field and near the behind slope platform and slope surface of the first slope for the vertical displacement field to the altitude of slope platform. The more sensitive soil is located near the bottom of potential landslide mass of secondary slope for the horizontal displacement field and near the slope shoulder for the vertical displacement field to the width of slope platform. The normalized sensitivity show that the height slope platform and the slope degree of the first slope have the most and the least influence on the maximum sensitivity value of the displacement field to side slope shape of two-stage ladder-type homogeneous soil slope.