论文部分内容阅读
大量研究表明,岩石经历塑性变形时其弹性参数会发生变化,即存在弹塑性耦合现象。为了研究岩石的弹塑性耦合特性,进行了两种大理岩的循环加、卸载试验。试验结果表明:与常规试验对比,循环加、卸载试验对岩石的变形、强度及破坏形态影响较小;弹性参数随塑性变形的变化显著,考虑弹塑性耦合时,弹性参数取体积模量和剪切模量更为合适;基于Mohr-Coulomb屈服准则,计算得到了强度参数,即黏聚力和内摩擦角随塑性内变量的演化规律。所得结论将为岩石弹塑性耦合本构模型的建立提供基本的试验支持。
Numerous studies show that the rock undergoes plastic deformation its elastic parameters will change, that there is a phenomenon of elastic-plastic coupling. In order to study the elasto-plastic coupling characteristics of rock, two kinds of marble loading and unloading tests were carried out. The experimental results show that the cyclic loading and unloading tests have little effect on the deformation, strength and failure mode of the rock compared with the conventional tests. The elastic parameters vary significantly with the plastic deformation. When considering the elastic-plastic coupling, the elastic parameters take the bulk modulus and the shear modulus The shear modulus is more suitable. Based on the Mohr-Coulomb yield criterion, the strength parameters, ie the evolution of cohesion and internal friction angle with plastic internal variables, are calculated. The conclusions obtained will provide basic experimental support for the establishment of rock-plastic coupling constitutive model.