Ningbo University,Institute of Rock Mechanics
School of Civil Engineering,Shaoxing University

为解决传统Morgenstern-Price法未考虑岩体抗剪强度参数离散性的问题,引入Barton-Bandis准则对Morgenstern-Price法进行改进,考虑了岩体结构面抗剪强度参数JRC,JCS,r的离散性,充分呈现了岩体结构面特征参数的真实统计分布特征,并利用此方法对边坡稳定性进行了分析;而后结合改进的Rosenblueth法对边坡的破坏概率进行了计算。以凤田矿山为背景,利用改进的Morgenstern-Price法计算得到稳定性系数为1.013,说明凤田矿山处于欠稳定状态;其结合改进的Rosenblueth法得到边坡破坏概率为38.759%,说明凤田矿山处于中等危险状态。通过与其他方法的评价结果对比发现,改进的Morgenstern-Price法既能用于计算边坡稳定性系数,又能与改进的Rosenblueth法相结合计算边坡破坏概率,是一种方便、有效的边坡稳定性分析方法,可满足矿山边坡现场施工的要求。

The internal rock mass is widely distributed with structural planes,and its shear strength exhibits nonlinear characteristics under different normal stresses,influenced by joint roughness coefficient ( JRC ),rock strength ( JCS ),and residual friction angle ( r ). Based on the Mohr-Coulomb criterion,the traditional Morgenstern-Price method calculates normal stresses but fails to fully consider the variability of shear strength parameters of rock mass. This study introduces the Barton-Bandis criterion into the Morgenstern-Price method,proposing an improved Morgenstern-Price method ( referred to as MP-BB method hereafter ). The MP-BB method is then used to analyze the slope stability and calculate the failure probability of the slope in conjunction with the improved Rosenblueth method. The research shows that the MP-BB method takes into account of the variability of shear strength parameters of rock mass ( JRC,JCS, r ) associated with structural planes,fully reflecting the true statistical distribution characteristicsof these parameters. The stability coefficient calculated based on the MP-BB method is more accurate than that of the M-C criterion. The correctness of the failure probability calculation results using the MP-BB method is verified using the Monte Carlo method. Therefore,the MP-BB method can be considered an effective slope stability analysis method.