基于强度折减法及流固耦合的土石坝稳定性分析

Analysis of Earth-rock Dam Stability Based on Strength Reduction Method and Fluid-structure Interaction

为了使土石坝坝坡稳定分析结果更加符合工程实际,笔者先后使用ABAQUS有限元软件实现了以强度折减法求解坝坡安全系数,以渗流理论分析了土石坝的渗流稳定,以及求解了考虑流固耦合的土石坝坝坡安全系数。结果表明:有限元强度折减法比极限平衡法更合理、更准确,采用ABAQUS对非饱和土进行稳定渗流分析是合理的、可行的,考虑流固耦合求解土石坝坝坡安全系数更符合工程实际情况,所得结果更加准确。

In order to make results of earth-rock dam slope analysis more in line with actual engineering condition, this paper adopts strength reduction method to calculate safety factor of dam slope by ABAQUS finite element software, analyzes seepage stability of earth-rock dam based on percolation theory, and calculates safety factor of earth-rock dam slope in consideration of fluid-structure interaction. The above results show that the finite element strength reduction method is more reasonable and accurate when compared with the limit equilibrium method, the seepage stability analysis of unsaturated soil is reasonable and feasible by ABAQUS finite element software, and the derived safety factor of dam slope is more in line with the actual engineering condition in consideration of fluid-structure interaction; therefore, the above results are more accurate.