Using the Morgenstern–Price Method and Cloud Theory to Invert the Shear Strength Index of Tailings Dams and Reveal the Coupling Deformation and Failure Law under Extreme Rainfall

It is difficult to obtain reliable shear strength parameters for the stability analysis and evaluation of tailings dams in an unstable state. In this study, sensitivity index safety factor a dam was evaluated. The cohesion C range earth rock state determined by factor, Morgenstern–Price method used inversion. During parameter inversion, uncertainty reasoning established based on cloud theory, which overcomes problem that fuzziness randomness quantitative value are transferred qualitative concept factor. results show change has greater influence Fs dam, inversion 8.6901 kPa. deformation failure under extreme rainfall conditions analyzed using modified value. toe becomes main response area plastic slowly expands interior, showing creep deformation. displacement field gradually transfers from accumulated with flow direction, causing erosion damage. This study provides new idea reference disaster prediction prevention subjected rainfall.