雄安新区某建筑基坑边坡稳定性分析

Slope stability analysis of a building foundation pit in Xiong'an New Area

文章以雄安新区某小区建筑基坑边坡为例,采用极限平衡法分析了正常工况和暴雨工况下边坡的整体稳定性和局部稳定性。结果表明,正常工况下基坑边坡的整体稳定性和局部稳定性满足规范要求,判定为边坡稳定;暴雨工况下,边坡浅层孔隙水压力升高,并在浅层形成暂态饱和区,导致边坡临界滑动面位置变浅,同时安全系数减小,暴雨工况下边坡整体和上台阶为基本稳定,下台阶为稳定。

Taking the slope of a building foundation pit in a residential area in Xiong'an New Area as an example,this paper uses the limit equilibrium method to analyze the overall and local stability of the slope under normal and heavy rainfall conditions.The results indicate that under normal conditions,both the overall and local stability of the foundation pit slope meet the specified requirements,confirming the slope stability.Under heavy rainfall conditions,the shallow pore water pressure of the slope increases,forming a transient saturation zone in the shallow layer.This leads to a shallower critical sliding surface and a decrease in the safety factor.Despite these changes,the slope remains generally stable under heavy rainfall conditions,with the upper terrace being fundamentally stable and the lower terrace being stable.