岩石流变断裂扩展的力学分析

Mechanical Analysis of Creep Extension of Crack in Rock

用三点弯曲试验方法对层状岩石的流变断裂特性进行了试验研究与理论分析，得到了岩石的流变断裂准则，验证了直接拉伸试验所得到的试验结果，分析了层理的存在对断裂扩展的影响，并用流变力学的理论探讨了相关试验参数的物理意义．在此基础上，用硬化作用与软化作用的观点进一步分析了岩石的流变断裂机理，并用重正化群的理论对岩石的流变断裂机理进行了定量分析．

The rheological fracture of lamellar rock is studied theoretically and experimentally by means of three--point bending test. A criterion of rheological fracture of rock is obtained, which confirms the result of the direct tensile test. Besides, the influence of bedding upon rheological fracture of rock is analysed, and experimental parameters are discussed in rheology. In addition, the creep fracture mechanism of rocks is explained with the viewpoint of hardening and softening effect, It is futher studied by renormalization group.