顺层岩质边坡稳定性极限平衡分析方法比较研究

顺层岩质边坡是影响工程岩体稳定性、导致地质灾害发生的典型边坡岩体结构类型。顺层岩质边坡的稳定性是边坡研究的重要内容。不平衡推力法、Sarma法和直线型分析法是应用广泛的边坡稳定性分析方法,在介绍这3种方法的基础上,以宜巴高速舒家槽大桥桥基顺层岩质边坡为研究对象,分析边坡岩体结构特征和破坏情况,运用这3种方法分析边坡的稳定性,并与边坡岩体结构特征和破坏情况进行比较分析。研究结果表明:Sarma法稳定性分析结果与边坡实际破坏情况非常吻合,更适合于节理裂隙发育的顺层岩质边坡的稳定性分析;不平衡推力法计算结果偏大;直线型分析法结果偏小,较保守。

Comparative Study on Limit Equilibrium Methods forStability Analysis of Bedding Rock Slope

Bedding rock slope is a typical rock mass structure which influences the stability of engineering rock mass and leads to geological hazards. Several methods of slope stability analysis,namely,Sarma Method,Imbalance Thrust Force Method,and Linear Sliding Surface Method,are compared in this paper. With the bedding rock slope at the bridge foundation of Shujiacao Bridge of Yichang-Badong Highway as an example,the rock slope stability was analyzed by these three methods. The analyzed results were compared with the actual rock mass structure and damage of this bedding rock slope. The comparison shows that the result by Sarma method consists well with the actual situation of slope failure,it is more suitable for analyzing bedding rock slope with joint fissures; whereas the calculation result of Imbalance Thrust Force Method is larger,and Linear Sliding Surface Method is conservative and smaller.