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.
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