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为了充分发挥FLAC3D在数值计算方面的优势,解决在复杂地质体条件下岩体工程开挖存在的计算模型构建难度大、多采用简化模型而影响计算结果可靠性及准确性的问题。提出采用三维表面模型重建方法建立地质体及岩体工程的表面模型,确定岩层、开挖等的封闭空间区域;在此基础上,通过约束德洛内四面体剖分的方法对三维表面模型形成的空间区域进行网格剖分。分析了网格生成器TetGen的输入、输出数据结构,确定表面模型数据至TetGen、TetGen网格划分结果至FLAC3D的对应关系,实现能够准确描述地质体与工程开挖的FLAC3D计算模型的构建。通过某大型深部开采铜矿的多个岩层和首采区3个盘区63个采场的模型构建实例,证明该方法简单、可行、有效并且健壮。
In order to give full play to the advantages of FLAC3D in numerical calculation, this paper solves the problems that the computational model of rock excavation existing in complicated geology body is difficult to construct, and the simplified model is mostly used to affect the reliability and accuracy of the calculation results. The surface model of the geologic body and the rock mass engineering is established by using the three-dimensional surface model reconstruction method to determine the enclosed space area of the rock formation and the excavation. Based on this, the three-dimensional surface model is formed by constraining the Delaunay tetrahedron method Of the area of the grid meshing. The input and output data structures of the grid generator TetGen are analyzed, and the corresponding relationship between the surface model data and the TetGen and TetGen meshing results to FLAC3D is determined. FLAC3D calculation model can be accurately constructed to describe the excavation of the geological body and engineering. The construction example of 63 stopes in three plates of multiple plates of a large deep-mining copper mine and the first mining area proves that the method is simple, feasible, effective and robust.