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数值计算中利用随机分布对各单元赋予不同的物理力学参数来考虑岩石的非均质性,赋值过程是纯随机的,并没有考虑岩石矿物组成的结构特征。故提出一种新的岩石非均质参数赋值方法——岩石矿物细胞元随机性参数赋值方法,基于岩石矿物种类及其含量定义细胞元类别判定区间,利用Monte Carlo方法对各个细胞元进行矿物类别判定,并进行相应的参数赋值,通过各矿物细胞元的随机混合体来描述岩石的非均质性。该方法既考虑了组成岩石的矿物种类及其含量(结构特征),又考虑了组成矿物在岩石中的随机分布特征。针对矿物分布的随机特征,利用两矿物细胞元混合模型和三矿物细胞元混合模型进行数值试验,研究了矿物细胞元随机分布特征对岩石宏观力学参数的影响。研究结果表明,岩石矿物细胞元随机性参数赋值方法具有结构性和随机性的双重特性,其随机性不依赖于随机参数,岩石宏观力学参数受细胞元随机性特征的影响很小。
In the numerical calculation, the heterogeneity of rocks is given by assigning different physical and mechanical parameters to each unit by using random distribution. The assignment process is purely random and does not consider the structural characteristics of the rock mineral composition. Therefore, a new method for assigning rock heterogeneity parameter - a random parameter assignment method for rock mineral cell is proposed. Based on the rock mineral species and its content, the cell type discriminant interval is defined. Monte Carlo method is used to classify the mineral elements Judgment, and the corresponding parameter assignment, by a random mixture of mineral cells to describe the rock heterogeneity. The method takes into account not only the types and contents (structural characteristics) of the rocks that make up the rock but also the stochastic distribution of the minerals in the rock. According to the random characteristics of mineral distribution, the mixed model of two mineral cells and the mixed model of three mineral cells were used to carry out numerical experiments. The influence of random distribution of mineral cells on macroscopic mechanical parameters of rock was studied. The results show that the stochastic parameter assignment method of rock and mineral cell has the dual characteristics of structure and randomness. The randomness does not depend on random parameters and the macroscopic mechanical parameters of rock are less affected by the stochastic character of cell.