基于水平微分法的护坡工程袋柔性挡墙的力学分析

摘要

Based on the theory of Coulomb earth pressure,the theory of horizontal differential and the theory of slope stability,the mechanics analysis model of flexible geo-bag retaining wall was established. The influence of the design parameters of the flexible retaining wall on the stability of flexible retaining wall and the stability of slope was analyzed. The results show that the earth stress of the flexible earth retaining wall is between the active earth pres-sure and the passive earth pressure. The position of bulging demarcation point is selected as the inflection point. Above the demarcation point,earth pressure changes linearly with the deepening depth,and below the demarcation point,earth pressure increases sharply with the deepening depth. The maximum horizontal displacement of the geo-bag retaining wall decreases with its width and increases with its height as well as the slope ratio. The safety factor of slope stability increases with the flexible retaining wall's width and the flexible retaining wall's height as well as the slope ratio.%基于库伦土压力理论、水平微分法理论和边坡稳定理论,建立了柔性挡墙力学分析模型,并分析了护坡工程袋柔性挡墙的设计参数对柔性挡墙稳定性与边坡稳定性的影响.分析结果表明:护坡工程袋柔性挡墙的应力分布介于主动土压力与静止土压力之间;以鼓胀分界点的位置为拐点,分界点以上的土压力随深度加深呈现线性变化,分界点以下的土压力随深度的加深急剧增大;护坡工程袋柔性挡墙的最大水平位移随着其宽度的增加而逐渐降低,随着其高度与边坡坡比的增加而增加;边坡稳定安全系数随着柔性挡墙宽度的增加而增加,随着柔性挡墙高度与边坡坡比的增加而降低.