基于弹性应变能的岩石强度准则

Strength criterion of rock based on elastic strain energy

为建立更符合岩石屈服与破坏机制的强度准则,基于能量转化是岩石屈服与破坏的本质属性,采用试验与理论分析相结合的方法,对岩石屈服与破坏准则进行了研究。以岩石强度与整体破坏准则为基础,通过引入弹性应变能释放分散系数,建立基于弹性应变能强度准则;分别采用M-C准则、Murrell准则、三剪能量准则、统一能量准则、三维H-B强度准则及基于弹性应变能岩石强度准则对盐岩和花岗岩的破坏强度进行了计算。结果表明,基于弹性应变能岩石强度准则的计算结果与试验值比较吻合(尤其是真三轴试验条件下),并且分析了产生上述结果的内在机制。所建立的强度准则仅需测定常规岩石力学参数(单轴抗压强度与泊松比),物理力学意义明确,对于定量描述岩石的屈服与破坏特性具有重要的意义。

On the basis of the relations between energy dissipation, energy release and global failure, with integrated experimental test and numerical simulation, a new strength criterion has been proposed for hard and soft rocks. By adopting the combination of experiment and theory analysis method, the rock yield and failure criteria are studied. The strength criterion of rock mass is build based on criteria strength and structural failure of rocks and the diffusion coefficient of elastic strain energy; The failure strength for rock salt and granite is calculated and with the following criteria respectively: Mohr-Coulomb criterion, Murrell criterion, triple shear energy yield criterion, unified energy yield criterion, Hoek-Brown criterion and yield and failure revised criterion. The results show that based on the elastic strain energy of rock strength criterion of the calculated result is more accurate and the error is more stable as well especially under true triaxial tests and the intrinsic mechanism of above-mentioned results is analyzed. The strength criterion has less parameters and has simple, so, it is significant for the accurate quantitative analysis of rock yield and failure characters. © 2016, Science Press. All right reserved.