基于界面元的岩体裂隙网络渗流模型中 不稳定块体预测

 以野外不连续面现场地质调查所获得的真实裂隙展布为基础，以随机不连续面三维网络计算机模拟技术为指导，建立岩体不连续面空间分布概率统计数值模型；在此基础上，将裂隙网络和界面元相结合，用水力学和几何参数来表征裂隙岩体内渗透空间结构的具体布局，建立基于界面元与裂隙网络耦合的裂隙网络渗流模型，该模型可以通过界面元法对渗流场的模拟获得岩体网络裂隙渗流的渗径，而且可以计算出水头分布的情况，进而可以搜索出所有在临空面上出露的有限块体，确定其空间几何形态和几何参数，实现不稳定关键块体自动搜索，对于评价及预测关键块体的稳定性具有重要意义。

PREDICTION OF INSTABILITY BLOCK IN ROCK FRACTURE NETWORK SEEPAGE MODEL BASED ON INTERFACE STRESS ELEMENT

he probability distribution model of discontinuities is established through the three-dimensional network modeling based on real joint distribution accessed geological survey in-situ. The fracture network coupled seepage model based on interface stress element can be founded by the use of hydraulic parameters and geometry parameters to characterize space structure infiltration layout in rock mass，which can access rock network fractured seepage path，and also it can calculate the water heat distribution，then it can search out all limited block in the exposed surface sections and determine its space geometry and geometric parameters，to achieve to search automatically the instability key block. All of these are of great significance to evaluate and predict the stability of the key block.