关键词: 边坡稳定性　, 边坡失稳　, 复合边坡　, 双系数折减方法　, 有限元极限平衡法　, 强度折减法

Abstract: Slope stability is an important guarantee for the safe production of open-pit mines,and its effective mainte nance is of vital significance for the prevention of landslides,collapses and other disasters.Aiming at the shortcomings of the traditional method of using a single parameter to assess the difficulty of fully reflecting its true stability state,this paper propo ses a multi-parameter synergistic attenuation of strength discount method for calculating the stability coefficients of slopes,so as to realize a more reasonable stability evaluation.Firstly,through theoretical analysis and numerical simulation,the key mechani cal parameters affecting the stability of the slope are identified as cohesion (c) and angle of internal friction (φ),while the in fluence of parameters such as modulus of elasticity,Poisson′s ratio and soil bulk weight is relatively weak.Further analysis shows that there is a significant nonlinear coupling relationship between slope stability coefficient and c and φ.Accordingly,this paper constructs a method for calculating the safety coefficient based on the synergistic discounting of cohesion and internal friction angle for slope stability evaluation.In heterogeneous slopes,comparative calculations were performed using the finite el ement limit equilibrium method and the conventional strength reduction method.The results indicate that the two-parameter strength reduction method exhibits high accuracy in slope stability assessment.In contrast,the coefficient of safety of the limit equilibrium method and the traditional reduction method in complex slopes is overestimated.Finally,the mathematical relation ship between the slope safety factor and slope displacement was established using the slope of Sijiaying Mine as a case study, further demonstrating that the method proposed in this study has significant advantages in improving the evaluation accuracy. The method can provide more reliable technical support for slope stability analysis of open pit mines.

Key words: slope stability,slope instability,composite slope,dual-factor reduction method,finite element limit equilibri um method,strength reduction method