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为了更好地研究单向受载下岩石的本构关系和损伤演化规律,利用泥岩的单向压缩和声发射试验,分析了岩石的变形特点、能量转化和声发射特征,在此基础上,分别建立考虑能量耗散和声发射的损伤演化方程,提出初始损伤和临界损伤的定义,构建了能够反映岩石压密过程和残余强度阶段的损伤本构模型,并通过单向压缩试验结果对比分析了两种损伤演化规律及理论损伤本构关系。研究结果表明,两种损伤演化规律基本一致,都经历损伤缓慢增加、加速增加和残余损伤3个阶段;材料参数分别影响应力强化、软化和整体应力-应变曲线;两种理论损伤本构关系均较好地反映了岩石的单向受载变形特征,从而证明了所建损伤本构模型符合实际。
In order to better study the constitutive relationship and damage evolution of rock under uniaxial loading, the characteristics of rock deformation, energy conversion and acoustic emission were analyzed by unidirectional compression and acoustic emission tests of mudstone. On the basis of this, The damage evolution equations considering the energy dissipation and acoustic emission are respectively established. The definitions of initial damage and critical damage are proposed. The damage constitutive model which can reflect the rock compacting process and the residual strength stage is constructed. By comparing the uniaxial compression test results Two kinds of damage evolution rule and theoretical damage constitutive relation. The results show that the evolution of the two damage are basically the same, all experienced three stages of slow increase, accelerated increase and residual damage. The material parameters respectively affect the stress strengthening, softening and the overall stress-strain curve. Both theoretical damage constitutive relations Which can well reflect the uniaxial deformation of rocks. It proves that the damage constitutive model is in line with the actual situation.