用混合边界元法解岩体不连续问题

Application of mixed boundary element method in discontinuous rock mass

介绍了一种混合边界元法——耦合直接边界元法与位移间断法（Ｔｈｅ Ｄｉｓｐｌａｃｅｍｅｎｔ Ｄｉｓｃｏｎｔｉｎｕｉｔｙ Ｍｅｔｈｏｄ），该方法分别采用边界单元和位移间断 单元模拟结构的边界及各种不连续构造，适于求解工程中含有软弱结构面岩 体的应力分析问题．由于在位移间断单元上只定义了位移差为基本未知量， 总体方程阶数较一般边界元法显著降低，从而节省了机时和存储量．

This paper presents a mixed boundary element method-the coupling of DBEM and DDM. In this method,the boundary elements and the displacement discontinuity elements are employed to simulate the boundary of the structure and the involved discontinuities,respectively. It is suited to solve the problems with the stress analysis of jointed rock masses. Because on DD element only the discontinuities are defined as unknowns, the order of the general system of equations is reduced greatly as compared with the common BEM. Based on this method a computer code- LBEDDM-is written and applied to an underground excavated problem.