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为了建立能够描述岩石宏观变形及其组成部分的变形模拟方法,考虑微缺陷的不均匀性对岩石宏观变形产生的影响,将岩石视为由空隙部分材料和骨架部分材料两部分组成。首先,基于岩石各组成部分材料变形分析,利用真应变描述方法及非线性变形的特点建立空隙部分材料的变形力学分析方法,同时,引入统计损伤以及固体力学理论建立骨架部分材料的变形力学分析方法。然后,通过岩石及其组成部分的变形力学分析建立岩石宏观变形力学分析方法,从而获得能够模拟岩石变形破坏全过程的统计损伤本构模型,并给出了模型参数的确定方法。最后,将文中模型与既有模型的理论曲线与试验曲线进行了对比分析,且基于文中模型对岩石及其组成部分变形进行了讨论。研究结果表明:文中模型不仅能反映既有模型所描述的主要变形特征,还能克服其难以较好地反映初期宏观变形非线性的不足;同时,该模型还能描述岩石组成部分的变形过程,不仅揭示了岩石宏观变形与其组成部分变形之间的关系,也揭示了空隙部分材料变形是引起岩石宏观变形非线性的根本原因。表明本文模型与方法具有一定的合理性与优越性。
In order to establish the deformation simulation method that can describe the macroscopic deformation of rock and its components, considering the influence of the micro-imperfection inhomogeneity on the macroscopic deformation of rock, the rock is considered as the material composed of the gap part and the skeleton part. First of all, based on the deformation analysis of each component of rock, the deformation mechanics analysis method of the material in the void part is established by the method of true strain description and the nonlinear deformation. At the same time, the deformation mechanics analysis method of the skeleton part material is introduced by statistical damage and solid mechanics theory . Then, by means of deformation mechanics analysis of rock and its components, the macroscopic mechanical analysis of rock is established to obtain the statistical damage constitutive model which can simulate the whole process of rock deformation and failure, and the method of determining the model parameters is given. Finally, the theoretical and experimental curves of the model and the existing model are compared and analyzed, and the deformation of the rock and its components are discussed based on the model in the paper. The results show that the model can not only reflect the main deformation characteristics described by the existing models, but also overcome the shortcomings of the model, which can not well reflect the initial nonlinear deformation of macroscopic deformation. At the same time, the model can also describe the deformation process of rock components, It not only reveals the relationship between macro-deformation of rock and its component deformation, but also reveals that the deformation of the material in the gap is the fundamental reason for the nonlinear deformation of rock. It shows that the model and method in this paper have certain rationality and superiority.