节理岩体Hoek-Brown经验强度准则可靠度分析

The reliability analysis of the HoekBrown empirical strength criterion for rockmass

基于二滩水电站和溪洛渡的工程岩体实例，提出了岩体 Ｈｏｅｋ Ｂｒｏｗｎ 经验强度准则的可靠度计算方法，同时讨论了准则可靠度对 ｍ ，ｓ 等强度参数的变异系数的敏感性以及在三维岩体 Ｈｏｅｋ Ｂｒｏｗ ｎ 经验强度准则中第二主应力对可靠度的影响程度。通过分析指出， 强度参数的变异性是准则可靠度的决定性因素之一，因此， 岩体工程的详细勘察和试验以及对参数的变异性进行统计分析，对于工程设计来说是具有重大意义的。

On the basis of the Xiluodu Project and the Ertan Project,the method for calculating the reliability of the HoekBrown empirical strength criterion and the sensibility of the reliability of the criterion to the variation coefficients of parameters (such as m,s) are presented in this paper.Besides,the influence of the middle principal stress on the reliability for the 3 D HoekBrown empirical strength criterion is analyzed and discussed.Finally,the conclusion is that the variability of the strength parameters is one of the decisive factors affecting the reliability of the criterion.From this paper,it is known that the detailed survey and the experiment as well as the statistic analysis are important to the technical design.