非均匀性对岩石介质中裂纹扩展模式的影响

INFLUENCE OF HETEROGENEITY ON CRACK PROPAGATION MODES IN BRITTLE ROCK

运用岩石破裂过程分析ＲＦＰＡ２Ｄ系统，通过对岩石试样中预置的倾斜裂纹扩展过程的数值模拟，研究了材料非均匀性对岩石介质中裂纹扩展模式的影响．数值模拟再现了受压试样在裂纹扩展过程中逐步演变的应力场和应变场，以及与岩石非均匀性有关的声发射和断裂扩展模式的“岩桥”现象．模拟结果说明，岩石的非均匀性对含裂纹试样的变形、破裂过程及其破坏模式有很大的影响．

By using a rock failure process analysis code, RFPA, the influence ofheterogeneity on crack propagation modes in rock sample containing existing flaw isnumerically studied. The numerical simulation reproduces the evolution of the stressand strain fields in crack propagation process, the mode of acoustic emission relatedtO the heterogeneity of rock and the phenomenon of rock bridge related todiscontinuous failure. It is shown that tile heterogeneity of rock containing existingflaw has an important influence on the deformation, failure process and failure mode.