基于有限元极限平衡法的建筑荷载对土质边坡稳定性影响分析

Analysis of influence of building load on soil slope stability based on finite element limit equilibrium method

边坡坡顶建房可能会导致边坡失稳从而威胁人员生命财产安全。为分析建筑荷载及建筑物至坡顶距离对边坡稳定性的影响,以一均质土质边坡为例,将有限元极限平衡法与九种极限平衡法对天然状态边坡稳定性的分析结果进行了比较。将有限元法和极限平衡法相结合,计算不同建筑荷载与建筑物至坡顶距离组合下的边坡稳定系数,并对相关计算结果进行了相关性分析,确定了安全建筑距离范围。结果表明:有限元极限平衡法可以反映边坡土体真实的应力分布,计算的边坡稳定系数比九种极限平衡法更符合实际;建筑荷载与边坡稳定系数为负相关;在一定范围内,建筑物至坡顶距离与边坡稳定系数为正相关。本文分析结果为安全建筑距离设计提供参考。

Building a house on top of a slope may cause slope instability and threaten the safety of life and property.In order to analyze the influence of building load and the distance from the building to the top of the slope on the slope stability,a homogeneous soil slope is taken as an example to compare the finite element limit equilibrium method and nine limit equilibrium methods on the slope stability in a natural state.The finite element method and the limit equilibrium method are combined to calculate the slope stability coefficient under different combinations of building loads and the distance from the building to the top of the slope,and the correlation analysis of the relevant calculation results is carried out to determine the safe building distance range.The results show that the finite element limit equilibrium method can reflect the true stress distribution of the slope soil,and the calculated slope stability coefficient is more realistic than the nine limit equilibrium method;the building load and the slope stability coefficient are negatively correlated;the distance from the building to the top of the slope is positively correlated with the slope stability coefficient.The research and analysis results can provide reference for the reasonable selection of safe building distance.