细观介质拉压比对岩石破坏过程的影响

INFLUENCE OF RATIO OF MESOSCOPIC COMPRESSIVE STRENGTH TO MESOSCOPIC TENSILE STRENGTH ON PROGRESSIVE FAILURE OF ROCK Liang

通过应用岩石破裂过程分析系统RFPA2D,模拟了不同细观单元拉压比的岩石试件在单轴压缩试验下的破坏过程,分析了细观介质拉压比对岩石破坏过程中的力学行为和破坏机理的影响。结果表明,随着拉压比的提高,岩石的整体抗拉强度和残余强度逐渐降低,同时岩石的宏观破坏形式也由剪切破坏向拉伸破坏转变。当拉压比低于某一确定值时,拉压比对岩石的变形行为影响很小。

Numerical simulation software RFPA2D is used to analysis the progressive failure process of rock with different l,the ratio of mesoscopic compressive strength to mesoscopic tensile strength. Ten rock samples are divided into five sets with =l1,3,5,7 and 9,and they are subjected to uniaxial compressive loading. In order to investigate the influence of l on the fracture process and failure mode of rock,the rock samples in different sets are of the same mechanical parameters except l. The results show that l is an important parameter of rock. With the increase of l,the macroscopic peak strength and residual strength decrease and the failure mode changes from shear failure mode to tensile failure mode. However, when l decreases to a certain value, it has little influence on rock deformation and failure mode.