论文部分内容阅读
基于损伤力学和损伤阀值的概念,认为岩石在较小应力状态下为弹性阶段。当应力达到屈服状态时,发生连续损伤;而当完全损伤时,其应力-应变具有残余强度的变形特征。在此基础上,采用三参数Weibull分布描述岩石损伤演化机制,同时对Lemaitre应变等价性假设进行修正,考虑岩石内部损伤后沿着局部断裂带发生相对滑动变形所产生的滑动摩擦力,最终建立起新的岩石损伤模型。通过与试验结果进行对比分析,结果表明,所建立的损伤模型能够准确地描述岩石在低应力水平下的弹性变形和残余强度变形特征,在实际的工程中具有广泛的适用性。
Based on the concepts of damage mechanics and damage threshold, the rock is assumed to be in an elastic phase under less stressful conditions. When the stress reaches the yield state, continuous damage occurs, while when fully damaged, the stress-strain has residual strength deformation characteristics. Based on this, the three-parameter Weibull distribution is used to describe the rock damage evolution mechanism and the Lemaitre strain equivalence hypothesis is amended to consider the sliding friction force generated by the relative sliding deformation along the local fault zone after the rock internal damage, finally established Play a new rock damage model. The comparison between the experimental results and the experimental results shows that the established damage model can accurately describe the elastic deformation and residual strength deformation of rock under low stress level and has wide applicability in practical engineering.