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针对复杂的地质条件,运用三维极限平衡法对某水电站坝肩随机块体的稳定性进行分析,并研究了块体稳定系数Fs的敏感性影响因子。通过敏感性计算,确定了结构面抗剪强度参数(包括粘聚力C、抗剪断摩擦系数f)和结构面产状(包括倾向和倾角)两组主要影响因子,分析了以上影响因子与Fs的变化规律。根据主要影响因子的变化规律比较,得出结构面产状是影响随机块体稳定性主导因素的结论。敏感性影响因子的变化规律分析,为坝肩抗滑设计和治理提供了一定的理论依据。
According to the complex geological conditions, the stability of stochastic block at dam abutment of a hydropower station is analyzed by using the three-dimensional limit equilibrium method. The sensitivity factor of block stability coefficient Fs is also studied. Through the sensitivity calculation, the two main influencing factors of the shear strength parameters (including the cohesion C, the shear-resistant friction coefficient f) and the yield surface (including the inclination and dip) of the structural plane were determined. The law of change. According to the variation of the main influence factors, it is concluded that the occurrence of the structural plane is the main factor that affects the stability of the random block. The analysis of the variation of the sensitivity factor provides some theoretical basis for the anti-skid design and treatment of dam abutments.