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RFPA系统研究了围压对岩石破裂过程宏观力学行为的影响。计算结果表明 ,由于岩石非均匀的基本特征 ,具有带拉伸截断的Coulomb准则的基元构成的宏观破坏规律 (Mohr圆的包络线 )是复杂的、非线性的 ,与物理试验结果表现出良好的一致性。在较低围压条件下 ,岩石的压缩强度同围压系数具有线性关系。岩石的应力 应变全过程曲线随着围压的增加 ,延性和压缩强度均随之提高 ,模拟结果同试验结果有着良好的一致性。
The influence of confining pressure on the macroscopic mechanical behavior of rock during rupture was studied by RFPA system. The calculated results show that due to the non-uniform basic characteristics of rocks, the macroscopic failure law (the envelope of Mohr circle) of elements with Coulomb criterion with tensile truncation is complex and nonlinear, and the physical test results show Good consistency. At lower confining pressures, compressive strength of rock has a linear relationship with confining pressure coefficient. With the increase of confining pressure, the ductility and compressive strength of the whole curve of stress and strain of rock are both increased, and the simulation results are in good agreement with the test results.