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本文把被多组定向节理所切割的岩体视为各异向性的连续弹塑性体,探讨了其应力应变关系。文中考虑了节理刚度和产状对岩体变形特性的影响,给出了以常规岩石力学试验资料表示的节理岩体各向异性弹性矩阵的计算公式;考虑了节理岩体一般均沿节理面受拉开裂或剪切滑移的定向破坏特点,将塑性流动理论用于节理岩体的有限元分析。最后,编制了平面问题的非线性有限元程序,分析了坝基内含有两组节理的重力坝的坝基应力和屈服区。
In this paper, the rock mass cut by multiple sets of directional joints is regarded as the continuous elastic-plastic body with different anisotropy. The stress-strain relationship is discussed. In this paper, the influence of joint stiffness and occurrence on the deformation characteristics of rock mass is considered. The formula for calculating the anisotropy elastic matrix of jointed rock mass based on the conventional rock mechanics test data is given. Considering that the jointed rock mass is generally along the joint surface Pull the crack or shear slip directional damage characteristics, the plastic flow theory used to join rock mass finite element analysis. Finally, a non-linear finite element program of plane problem is developed, and the stress and yield zone of dam foundation are analyzed with two groups of joints.