基于颗粒流岩石破裂的宏观参数敏感性分析

Study on sensitivity of macro-parameter of rock failure by PFC method

在分析颗粒流理论的基础上,运用试误法建立了岩石破裂演化模型。在岩石破裂演化的数值模拟过程中,研究了PFC模型的微观参数(颗粒粒径、键结强度、刚度比和微观摩擦系数等),并针对不同的微观参数选取不同的值分别进行了模拟分析,通过模拟结果分析了微观参数对宏观参数的敏感性。模拟结果可为后期利用颗粒流对岩石力学试验进行模拟分析提供一定的依据。

Based on PFC （Particle Flow Code） theory, the rock failure evolution model is established by ＂trial and error＂ method. At the rock failure simulation process, micro parameters （particle size, bond strength, stiffness ratio and micro frictional coefficient） of PFC model are analyzed with different value. And simulation is made according to different value selected by micro parameters. Based on the simulation results, the sensitivity of macro parameters caused by different micro parameters is studied. The simulation results can provide some basis for PFC simulation of rock mechanical test.