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Investigation on 3D modelling and seepage simulation of stochastic fractures for jointed rock masses

DOI：10.7511/jslx20230504002

 作者 单位 E-mail 季慧 中国人民解放军 32576部队, 广州 510110 王鲁瑀 香港理工大学 土木与环境工程学院, 香港 999077 吴则祥 温州大学 建筑工程学院, 温州 325000 zexiang.wu@wzu.edu.cn 涂冬媚 温州理工学院 建筑与能源工程学院, 温州 325000

裂隙岩体数值仿真是研究工程岩体稳定性的重要方法之一,本文围绕三维裂隙岩体随机裂隙建模和渗流仿真展开研究。针对三维裂隙空间定量表征问题,基于空间解析几何方法导出三维裂隙产状控制方程,在此基础上发展了随机裂隙生成算法和网格剖分方案,为裂隙可视化和生成裂隙单元提供基础;讨论了一种处理三维交叉裂隙的方法,从而降低网格单元扭曲度。进一步,采用裂隙孔隙双重介质渗流模型,对三维裂隙岩体进行渗流仿真,通过算例展示了几种不同的裂隙分布形式及其网格剖分结果,分析了三维交叉裂隙模型和随机裂隙模型的渗流特性。

Simulation of fractured rock mass is vitally important in the analysis of the stability of engineering rock mass.This study investigates the modelling approach and seepage simulation of three-dimensional fractured rock mass.To achieve the quantitative representation of its three-dimensional fractures in space,the attitude equations of three-dimensional fractures are derived based on the analytic geometry.Based on these,the algorithm of generating random fractures and a mesh partition strategy are developed,which provide the basis of fracture visualization and generating fracture cells.Especially,a treatment of three-dimensional intersected fractures is developed,such that the distortion of the cells is reduced.Furthermore,the seepage model of dual fracture-pore media is applied to simulate seepage in three-dimensional fractured rock mass.Different patterns of fractures and the mesh partition results are illustrated.Moreover,seepage characteristics of three-dimensional intersected fractures and random fracturs are analyzed.