(1. 中南大学 资源与安全工程学院，长沙 410083；
2. 中国矿业大学 深部岩土力学与地下工程国家重点实验室，徐州 221008；
3. 中南大学 高等研究中心，长沙 410083)
摘 要: 在考虑强度准则参数粘聚力c、内摩擦角φ和岩石材料常数m随应变率增加而变化的基础上，分别提出了基于应变率效应的岩石动态Mohr-Coulomb准则和Hoek-Brown准则。花岗岩材料在6种围压下的三轴试验结果表明：当应变率从10-4 s-1增加到100 s-1时，粘聚力c和岩石材料常数m均随应变率增加而增加，但是内摩擦角φ则随应变率增加而减小。为此，给出了上述3项参数随应变率变化的函数关系，并在此基础上，分别提出了考虑率效应的动态Mohr-Coulomb准则和Hoek-Brown准则表达式。通过理论计算结果与试验数据的对比，发现动态Mohr-Coulomb准则适应于低围压情况，而动态Hoek-Brown准则在低围压和高围压情况下均适用。
关键字: 岩石力学；抗剪强度参数；应变率；动态Mohr-Coulomb准则；动态Hoek-Brown准则
（1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory for Geomechanics and Deep Underground Engineering,
China University of Mining and Technology, Xuzhou 221008, China;
3. Advanced Research Center of CSU, Central South University, Changsha 410083, China）
Abstract:Considering the changes of strength criterion parameters cohesion c, internal friction angle φ and rock material constants m with the increase of strain rate, the rock dynamic Mohr-Coulomb criterion and Hoek-Brown criterion based on strain rate effect were proposed in this study. According to the triaxial experimental data of a granite under six confining pressures, the results show that, when the strain rate increases from 10-4 s-1 to 100 s-1, the cohesion c and rock material constants m increase, while the internal friction angle φ decreases with the increase of strain rate. The relationship between each strength criterion parameter and strain rate is given firstly. On this basis, the expression of dynamic Mohr-Coulomb criterion and Hoek-Brown criterion considering strain rate effect are presented, respectively. Through the comparison of theoretical calculation results with the experimental data, it can be concluded that the dynamic Mohr-Coulomb criterion is suitable for low confining pressure situation, while the dynamic Hoek-Brown criterion is applicable under low and high confining pressure conditions.
Key words: rock mechanics; shear strength parameters; strain rate; dynamic Mohr-Coulomb criterion; dynamic Hoek-Brown criterion
