岩石破裂过程中围压效应的数值试验研究

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、一笥的，与物理试验结果表明出良好的一致性，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 Numerical Simulation of Effect of Confining Pressures on Failure Process of Rock

A new numerical code RFPA 2D is developed at CRISR,in Northeastern University.We have used the code for studying the effect of confining pressures on macroscopic behaviour of rock specimen in the failure process.The results from the simulation RFPA 2D show that the macroscopic failure law of rock,consisting of element following criterion Coulomb with cut off,is complex and nonlinear due to the basic heterogeneous characteristic of rock,and they are corresponding well with the experiences observed in laboratory.On condition of low confining pressures,the simulating compression strength keeps linear relation with confining pressure's coefficient.The strength and ductility have enhanced with the confining pressure increasing,and it is consistent well with results of experience observed in laboratory.