不连续岩体二维复合单元法前处理

Pre-process of two-dimensional composite element method for discontinuous rock masses

研究了不连续岩体二维复合单元法前处理问题,重点讨论了区域行波法自动离散、复合单元拓扑信息自动生成时的线段求交、虚实结点采用和子单元块细分等几个关键问题.给出了不连续岩体复合单元拓扑信息自动生成程序系统流程图,利用面向对象技术开发了相应的前处理器.以三板溪进水口边坡为算例对该系统的功能与稳定性进行了考证,并和有限元分析的前处理过程进行了对比,证明了其可用性和高效性.

The pre-process of two-dimensional composite element method for discontinuous rock masses is studied systematically, and some related key problems are discussed in details, such as automatically generating solid models by advancing front method, obtaining an intersection point of two line segments, adopting right virtual and real nodes, sub-element further division for creating composite element topological information, etc.. The program flow chart of automatic generating composite element topological information is also provided, and corresponding preprocessor is developed by object-oriented technique. The Sanbanxi intake slope example is adopted to verify the functions and stability of the preprocessor and the two analytical results are compared between composite element method and finite element method, which shows the feasibility and high efficiency of the preprocessor developed.