基于强度参数演化的裂隙岩体峰后应力-应变关系求法

完整岩块峰后应力应变关系的表达不能较好反映裂隙岩体峰后特性,为得到适合裂隙岩体峰后应力-应变关系,在试验数据基础上,基于库伦强度准则,分析裂隙岩体峰后强度参数的演化行为。根据裂隙岩体在不同围压和裂隙倾角时的不同峰后特性,将峰后应力-应变关系简化为A和B两种类型。以应变作为应变软化参数,假设黏聚力、内摩擦角为应变的分段线性函数,给出裂隙岩体峰后两种类型应力-应变关系式的求法。将A和B两种类型应力-应变关系式算出结果与试验结果进行比较,得出用裂隙岩体的应力-应变关系求得峰后应力-应变曲线与试验数据基本一致。

Study of post-peak stress-strain relationship of rock mass with jointsbased on evolution of strength parameters

The post-peak stress strain relationship expression of intact rock cannot well reflect post peak properties of rock masses with joint, in order to obtain post peak stress-strain relationship suitable for rock masses with joint, based on the test data, based on the Kulun strength criterion, analysis evolution of post peak strength parameters of rock masses with joint. According to rock masses with joint under different confining pressure and fracture dip at different post peak behavior, the post peak stress-strain relationship is simplified as A and B two kinds types, regarding maximum principal strain as strain softening parameter, on the assumption cohesion and internal friction angle are the piecewise linear functions of maximum principal strain, the method of solving express of two types post-peak stress-strain relationships of rock masses with joint is obtained. The results calculated by A and B two types stress-strain relationship compared with the experimental results, the use of rock masses with joint stress - strain relationship obtained post peak stress - strain curve agreed well with the experimental data.