岩石矿物细胞元随机性参数赋值方法研究

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。

Research on random parameter assignment method of rock mineral cell unit

In numerical calculation and analysis,the inhomogeneity of rock is reflected by giving different and random physical and mechanical parameters without considering the rocks’ structural characters—the contents of mineral composition in the rock.So a new parameter assignment method is provided considering the inhomogeneity of the rock materials—the random parameter assignment method of the rock mineral cell unit.The sort intervals of the minerals cell units are defined based on the sorts and contents of the rock minerals.For each unit,content judgment is dealt with by Monte Carlo mothod;and the corresponding value of the physico-mechanical parameters are given to the cell unit.Then the inhomogeneity of rocks can be described according to the random and uniform assembly of mineral cell units of the model.The method not only takes into account the contents(sorts and ratios)of mineral composition in the rock,but also considers the random distribution characteristic of the mineral.In the light of the random distribution characteristic of the mineral,choosing two minerals and three minerals for parameter assignment respectively;a series of numerical experiments are taken to research the influence of the random distribution characteristic of the mineral on macro mechanical parameters of the model.The study results indicate that the random parameter assignment method of the rock mineral cell unit has dual characteristics of structure and randomness;and the random characteristic is independent of statistical parameter.The randomness has little or no influence on the macro mechanical parameters of the model.