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该文采用已发展的层状材料基本解对偶边界元方法,分析了层状裂隙岩体的力学特性。在分析无限域层状岩体中裂隙时,该对偶边界元方法退化为间断位移法。在建议的间断位移法中,只需沿裂隙一个面离散,采用9结点等参单元和非连续单元离散裂隙面。采用建议方法计算了作用有非均匀荷载矩形裂隙的间断位移。利用裂隙尖端附近的间断位移值,计算了应力强度因子。给出不同岩性组合情形时矩形裂隙应力强度因子的分布规律。
In this paper, the basic solution to the dual boundary element method of layered materials has been developed, and the mechanical properties of layered fractured rock masses have been analyzed. In the analysis of fissures in an infinite layered rock mass, the dual boundary element method degenerates into a discontinuous displacement method. In the proposed discontinuous displacement method, it is only necessary to discretize one side of the fracture, using 9-node isoparametric element and discontinuous element discrete fracture surface. The proposed method is used to calculate the discontinuous displacement of a rectangular crack with a nonuniform load. Using the value of discontinuous displacement near the crack tip, the stress intensity factor was calculated. The distribution rules of stress intensity factor of rectangular cracks are given when different lithology combinations are given.