岩石损伤本构模型及变形破坏过程的混沌特征研究

发布时间：2018-09-17 20:34

【摘要】：本文针对目前岩石本构关系的不足，利用中国矿业大学（北京）深部国家重点实验室自主研发的实验系统进行了岩石单轴、常规三轴压缩试验，对岩石变形力学特性规律及机理进行了详细的分析，在此基础上，，假设岩石由微元组成，借助非线性动力系统相关理论，建立了物理意义明确、能准确描述岩石变形破坏过程中各阶段损伤演化规律的模型，并进一步根据损伤力学相关理论建立了单轴压缩条件下岩石损伤本构关系，以及常规三轴压缩条件下考虑残余强度特征、脆性－延性转化特征以及应变硬化特征的岩石损伤本构关系，通过已有试验结果对其合理性及有效性进行了验证，以及借助混沌理论对岩石变形破坏过程中的混沌特征进行了相关研究。
[Abstract]:In this paper, the uniaxial and conventional triaxial compression tests of rock are carried out by using the experimental system independently developed by the State key Laboratory of China University of Mining and Technology (Beijing). On the basis of the detailed analysis of the deformation mechanics characteristics and mechanism of rock, the physical meaning of rock is established by using the theory of nonlinear dynamic system and assuming that rock is composed of micro-elements. The model of damage evolution in each stage of rock deformation and failure can be accurately described, and the damage constitutive relation of rock under uniaxial compression condition is further established according to the relevant theory of damage mechanics. The damage constitutive relationship of rock considering the characteristics of residual strength, brittleness and ductility transformation and strain hardening under conventional triaxial compression is verified by the experimental results. The chaos characteristics in the process of rock deformation and failure are studied by means of chaos theory.
【学位授予单位】：中国矿业大学（北京）
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TU45

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