基于强度折减法的坝体边坡稳定性分析

Stability Analysis of Dam Slope Based on Strength Reduction Method

摘要: 土石坝作为水利工程与防洪体系的核心构筑物，其边坡稳定性直接关系到下游区域的生命财产安全与社会经济发展。研究采用有限元分析方法–强度折减法，将土体抗剪强度指标进行折减，以确定边坡达到临界失稳状态时的安全系数。同时，结合达西定律与莫尔–库仑屈服函数，准确描述了渗流场与土体应力应变关系。结果表明，当安全系数超过1.85时，土石坝位移显著增加，出现滑移面，且等效塑性应变集中在顶部，表明此时堤坝进入失稳状态。此研究为土石坝设计、风险预警及加固策略提供了可靠理论依据，有助于提升土石坝安全性与稳定性。

Abstract: As the core structure of water conservancy project and flood control system, the slope stability of earth rock dam is directly related to the life and property safety and social and economic development of the downstream area. In this paper, the finite element analysis method strength reduction method is used to reduce the soil shear strength index to determine the safety factor when the slope reaches the critical instability state. At the same time, combined with Darcy’s law and Mohr Coulomb yield function, the relationship between seepage field and soil stress and strain is accurately described. The results show that when the safety factor exceeds 1.85, the displacement of the earth rock dam increases significantly, and the slip surface appears, and the equivalent plastic strain is concentrated on the top, indicating that the dam enters an unstable state at this time. This study provides a reliable theoretical basis for the design, risk warning and reinforcement strategy of earth rock dams, and helps to improve the safety and stability of earth rock dams.