拱座稳定分析中脆性岩体抗剪断参数取值研究

发布时间：2018-06-10 03:27

本文选题：强度参数标准值 + 峰值平均值　；参考：《地下空间与工程学报》2017年S2期

【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。
[Abstract]:The stability of arch dam abutment (abutment) is studied by the method of partial coefficient. One of the key problems is how to determine the standard value of shear strength parameter of foundation rock mass. This paper analyzes the advantages and disadvantages and practicability of four common methods from the point of view of the guarantee rate and variation coefficient of the different strength parameters, and combines the engineering examples of the rock mass strength parameters of the arch base of two giant projects of Jinping first Hydropower Station and Xiluodu Hydropower Station. The rationality of taking the mean value of parameters as the standard value of shear strength of brittle rock mass is demonstrated. It is suggested that in the revision of the Code for Design of concrete Arch dams, the average value of the small value of shear strength parameters of brittle rock mass should be taken as its standard value, and the material partial coefficient and control index of stability analysis of arch base should be determined accordingly.
【作者单位】：中国电建集团成都勘测设计研究院有限公司;
【分类号】：TV223

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