岩体破坏过程数值模拟中网格单元力学参数赋值的研究

MECHANICAL PARAMETERS ESTIMATION FOR THE LATTICE ELEMENTS IN NUMERICAL SIMULATION OF ROCK FRACTURE PROCESSES

基于非均质岩体力学参数具有空间变异二重性,应看成是空间随机场这一观点,将地质统计学中有关随机场的空间变异性分析和估值原理与随机场的离散相结合,对岩体破坏过程数值模拟中网格单元力学参数的估值做了探讨,并进行了实例计算模拟。该方法作为一种空间随机场方法,与现有的统计分布加随机赋值法相比,可克服后者只注重随机性而忽视结构性的缺点,从而能使赋值更真实地再现非均质岩体力学参数所具有的空间变异二重性特征。

The mechanical parameters estimated for the lattice elements in a rock mass is studied theoretically and practically by combining the geostatistical spatial variation analysis and value estimation methods with the discretion of spatial random fields. This work is based on the view that the spatial variation of the rock mechanical parameters in a heterogeneous rock mass has double spatial variation characteristics: the stochastic and the structural, which should be treated as the spatial random field method. This method can overcome the short- comings existing in the classical statistic methods in which only the stochastic spatial variation characteristics are considered while the other would not. Additionally, the method also can maintain the real practical double characteristics of the random field better in the processes of spatial variation analysis and value estimations.