有限元法在岩质边坡稳定性分析中的应用示例

Application Example of Finite Element Method in the Stability Analysis of Rock Slope

本文讨论了岩质边坡失稳破坏的成灾机理及影响因素,对边坡稳定性分析的常规方法进行了分析比较,提出边坡内部应力水平和分布是影响边坡稳定性的决定性因素。以北京门头沟山区某一滑移式崩塌隐患点为研究对象,采用有限元数值模拟方法分析比较软弱夹层对边坡体内应力、应变场的影响,说明了岩质边坡由软弱夹层及其强度指标所决定的重力破坏机理,并对有限元数值方法存在的不足和问题提出思考。

This paper introduces the mechanism and influencing factors of rock slope instability and failure,analyzes and compares the conventional methods for slope stability analysis.It is proposed that the internal stress level and distribution of the slope are the decisive factors affecting the stability of the slope.The influence of weak interlayer on the stress and strain field in a rock slope with potential collapse in the Mentougou area in Beijing are analyzed by finite element method.The analysis results reveal that the gravity failure of a rock slope is determined by weak structures and their strength.At last,the shortcomings and problems of the finite element numerical method are pondered.