极限平衡法在露天边坡稳定性评价中的适用性探讨

Discussion on the applicability of limit equilibrium method in stability evaluation of open slope

以北厂-架崖山北帮边坡为例,根据其结构面切割特征及滑移面形态,探讨了Janbu法、Spencer法以及Morgenstern-Price法在岩质节理边坡稳定性分析计算中的适用性,并对其采用的计算方法在自重和地震工况下的失效概率进行分析。分析结果表明:对于岩质节理边坡采用圆弧条分法进行安全系数时计算结果偏于保守,其失效概率较采用非圆弧形滑面高20%;采用不同计算方法时,Morgenstern-Price法失效概率最大,这对边坡失稳准确评价具有较好的指导意义。

Take the North Plant-Jiashan North Slope as an example.Based on the structural plane cutting characteristics and the slip surface morphology,the stability analysis of the rock joint slope by Janbu method,Spencer method and Morgenstern-Price method is discussed.The applicability of the medium is analyzed by the calculation method used in its own weight and seismic conditions.The analysis results show that the calculation results of the safety factor for the rock jointed slope are conservative,and the failure probability is 20%higher than that of the non-circular slip surface.When using different calculation methods,Morgenstern-Price The law has the highest probability of failure,which has a good guiding significance for the accurate evaluation of slope instability.