基于广义Hoek－Brown准则的边坡安全系数间接解法

为了将强度折减法与Hoek－Brown准则相结合，可通过2种方法间接得到安全系数,即直接折减Hoek－Brown参数及计算等效Mohr－Coulomb参数方法.理论分析表明，前者存在一定困难，因此选用后者.首先计算与Hoek－Brown参数对应的等效黏结力和内摩擦角；然后采用位移突变失稳判据，由Mohr－Coulomb强度折减法间接得到广义Hoek－Brown准则下边坡的安全系数.结果表明：间接计算方法方便可行，具有实用价值.

The indirect calculation method for the safety factor of slope based on generalized Hoek-Brown criterion

There are two methods to combine the strength reduction method with Hoek－Brown criterion, ① calculating the safety factor of slope by direct reduce the parameters of Hoek－Brown criterion; ② indirectly calculating the safety factor of slope by parameters of Mohr Coulomb criterion. But the theoretical analysis show that there are some difficulties when applying the former method, so the latter method is chosen. Firstly,the equivalent cohesion  and internal friction angle corresponding to the parameters of Hoek Brown criterion were calculated. Secondly, based on reduction method of Mohr Coulomb criterion, and used the displacement mutation for the failure criterion, the safety factor of slope based on the generalize Hoek Brown criterion was calculated indirectly. The result shows that the indirect calculation method is correct and convenient for applying, which is also for the practical analysis of rock slope stability. 