极限平衡法与强度折减法在边坡稳定分析中的问题讨论

Discussion on the Problems of Limit Equilibrium Method and Strength Reduction Method in Slope Stability Analysis

为比较极限平衡法与强度折减法在边坡稳定分析中的区别,通过具体算例,将瑞典条分法、简化Bishop法、Janbu法等不同的极限平衡方法和有限元软件中强度折减法(SRM)应用于工程实践中,通过多种计算方法求解边坡安全系数,并对两种均质土坡稳定性结果进行分析。结果显示瑞典条分法可信度较低,安全系数仅为0.89。采用正交试验探讨了网格疏密对安全系数的影响,Abaqus所得等值线最深。此外,通过比较不同方法所得安全系数和临界滑动面,进一步探讨边坡失稳和滑动面搜索等问题。研究结果可对极限平衡法与强度折减法在工程中的应用提供一定的参考。

In order to compare the difference between limit equilibrium method and strength reduction method in slope stability analysis,through specific examples,different limit equilibrium methods such as Swedish slice method,simplified Bishop method,Janbu method and strength reduction method(SRM)in finite element software are applied to engineering practice.The slope safety factor is solved by various calculation methods,and the stability results of two homogeneous soil slopes are analyzed.The results show that the Swedish slice method has low reliability and the safety factor is only 0.89.Then,the influence of mesh density on the safety factor was discussed by orthogonal test,and the isoline obtained by Abaqus was the deepest.In addition,by comparing the safety factor and critical slip surface obtained by different methods,the problems of slope instability and slip surface search are further discussed.The research results can provide some reference for the application of limit equilibrium method and strength reduction method in engineering.