岩石破坏演化细观非均质物理元胞自动机模拟研究

SIMULATION STUDY OF ROCK FAILURE BASED ON MH-PCA MODEL

在传统元胞自动机基本理论的基础上,根据岩石结构细观非均质的特性和前人研究的基础,引进双参数Weibull分布,建立了一个改进的细观非均质物理元胞自动机模型,并利用该模型对不同均质度岩石材料的破坏演化进行动态模拟,模拟结果与试验结果吻合较好。

The rock material is heterogeneous from the construction of microscopic view; and the heterogeneous characteristic is one of most important factors that affect the rock failure pattern. In order to analyze this effect, a micro-heterogeneous physical cellular automata model (Mh-PCA model) is introduced according to cellular automata theory from general power view. In this model, the Moore neighbor is adopted and the Weibull distribution is used for simulating the rock heterogeneousness. Using the Mh-PCA model, the evolvements of rock failure are simulated for four kinds of materials with different homogeneous degrees; and the results show that the heterogeneous characteristic has a great effect on the rock failure; the larger the material homogeneous degree is, the fewer crack branches the rock has. All the results are in agreement with experimental results. The physical cellular automata theory can give a new idea for studying the rock failure.