三维随机裂隙岩体渗流分析的块体单元法1.pdf

第30 卷第8 期 岩 土 力 学 Vol.30 No. 8 2009 年8 月 Rock and Soil Mechanics Aug. 2009 文章编号：1000－7598 (2009) 08 －2535 －05 三维随机裂隙岩体渗流分析的块体单元法 殷德胜，汪卫明，陈胜宏 （武汉大学水资源与水电工程科学国家重点实验室，武汉 430072 ） 摘 要：岩体中的裂隙分布具有随机性，且渗流主要通过裂隙面进行。运用蒙特卡罗法模拟生成岩体中的随机裂隙面，基于 矢体的概念，实现了包括凹块体和多连通体在内的三维随机裂隙岩体的块体单元自动识别。假定岩块不透水、渗流仅通过裂 隙面进行，建立了三维随机裂隙岩体渗流分析的块体单元法。通过算例分析，验证了所提方法的准确性和有效性。 关 键 词：岩体；随机；裂隙；渗流；块体单元法 中图分类号：TU 454 文献标识码：A Block element method for seepage analysis in three dimensional random fracture network YIN De-sheng ，WANG Wei-ming ，CHEN Sheng-hong （State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China） Abstract: Fractures in rock masses are randomly distributed; and the seepage in the rock masses mainly happens in these fractures. The Monte Carlo method is adopted to generate the stochastic fracture network firstly. Then, on the base of the theory of directed body, the automatic identification method for three dimensional network with random fractures is realized, including the concave and multi-connected blocks. Next, based on the assumption that the intact rock is impervious and the water flows only along the fractures, the block element method for seepage analysis of three dimensional network with random fractures is established. Finally, two examples are studied to prove the precision and validity of this method. Key words: rock mass; random; fractures; seepage; block element method 性、非均匀性和各向异性。所以，对岩体进行渗流 1 引 言 分析，就不能忽略裂隙等小型结构面的影响。 岩体是一种由断层、节理和裂隙等结构面切割 经典渗流理论是以连续介质假定为基础，把实 完整岩石组成的不连续介质。这些结构面不仅是岩 际离散型的多孔介质抽象为