裂隙岩体稳定/非稳定渗流数值模拟

 发展裂隙岩体稳定/非稳定的渗流数值模型，一方面，依照裂隙面的密度、产状、位置、大小和开度的统计分布规律，使用蒙特卡罗模拟技术将完整岩石切割为三维不规则块体集合。根据相邻块体单元间产生的裂隙单元，构建三维裂隙网络系统，并附加各裂隙单元的水力特性；另一方面，对裂隙单元进行三角形单元的有限元网格划分，运用变分原理导出裂隙单元的渗流有限元求解方程。采用离散元方法中的动态松驰技术，在无须组装整体渗透矩阵的情况下求解裂隙网格各结点的水头值。最后，通过典型算例验证程序的可靠性及适用性。

NUMERICAL SIMULATION OF STEADY/UNSTEADY FLOW IN FRACTURED ROCK MASSES

A numerical model of steady/unsteady flow in fractured rock mass is developed. On the one hand,by using Monte Carlo technique,an intact rock is cut into 3D irregular block elements in term of the statistical distribution of density,orientation,position,size and aperture of fractures. A 3D fracture network is then constructed,which is composed of fracture elements between adjacent rock elements. The hydraulic properties are attached to the fracture elements. On the other hand,the fracture elements are discretized into triangular mesh,and the flow finite element equations are derived based on the variational principle. The dynamic relaxation technique in discrete element method is introduced to solve the permeability field without assembling the global matrix. Finally,the reliability and applicability of the program are validated by typical examples.