岩石均匀度对岩石本构关系影响的细观模拟研究

通过颗粒流程序模拟了岩石介质的均匀性对宏观力学特性的影响.结果表明:均匀度对岩石变形的非线性行为起到决定性的作用,降低均匀度,岩石变形的非线性行为明显增强,达到峰值应力后曲线出现弱化行为,残余强度的降低是渐进的;反之,变形的线性增强,变形后期出现显著的脆性和较低的残余强度特征.

Study on the Influence of the Heterogeneity of Rock on Stress-strain Relation of Rock in the Mesomechanical Scale

Because of the inhomogeneity, anisotropy and discontinuity, the mechanical property of rock masses are more complex than other materials. The stress-strain relation of rock have obvious non-linear feature ,which relates with the heterogeneity of rock. It is significant that the macro failure mechanics of rock are studied in the mesomechanical scale. The failure procedures of rock sample with different kinds of heterogeneity are simulated. The results show that the non-linear behavior of rock deformation and fracture pattern are more pronounced in heterogeneous cases than in homogeneous cases. With increasing the degree of rock heterogeneity, the initiate crack strength becomes lower and the plastic phase appears earlier.