【摘要】 用分项系数法来研究拱坝坝肩(拱座)稳定性,其关键问题之一是如何确定地基岩体的抗剪断强度参数的标准值,目前常见的四种取值方法的物理意义及数值差异都较大。从不同强度参数取值方法的保证率及变异系数的角度分析了四种常见方法的优劣及实用性,并结合锦屏一级水电站与溪洛渡水电站两个巨型工程拱座岩体强度参数的工程实例,论证了以参数的小值平均值作为脆性岩体抗剪断强度标准值的合理性。建议在《混凝土拱坝设计规范》修编时,将脆性岩体的抗剪断强度参数的小值平均值作为其标准值,并以此确定拱座稳定分析的材料分项系数与控制指标。更多还原

【Abstract】 One of the key problems of the arch dam abutment stability is to determine the standard value of the shear strength parameter of the foundation rock mass. At present,the physical values and numerical differences of the four common methods are large. This paper analyzes the advantages and disadvantages and practicability of the four kinds of common methods in parameter selection method with different intensity of guarantee rate and coefficient of variation of the angle. Combining with the Jinping 1 hydropower station and Xiluodu hydropower station,abutment rock strength parameters of the two giant engineering were discussed. Average value of the small parameter rationality is reasonable to to taken as the shear strength standard value of brittle rock mass. It is suggested that the minimum value of the shear strength parameters of the brittle rock mass should be taken as the standard value when the design specification for concrete arch dam is revised,and the material coefficient and control index of the arch stabilization analysis are determined.更多还原