论文部分内容阅读
本文较系统地讨论了模拟岩体弱面的等厚度四节点弱面单元,着重分析了岩体转动对弱面单元的影响。并指出:即使弱面厚度很小,但只要弱面产状处在不太有利位置,或绕弱面单元端点转动,都会给单元剪应力从正或负的方面带来很大影响,甚至改变单元由滑动所产生的剪应力的符号。文中详细的推导了考虑转动影响的弱面单元的几何矩阵[B]~e、单元应力矩阵[S]~e、单元刚矩度阵[K]~e以及单元初始应力所引起的等效结点荷载等计算公式。文中还证明了古德曼节理单元是等厚度弱面单元的一种特殊情况——即δ/l趋于零的情况.
In this paper, the equal thickness four-node weak plane element on the weak surface of the simulated rock mass is discussed systematically, and the influence of rock mass rotation on the weak surface element is emphatically analyzed. It is pointed out that even if the thickness of the weak surface is very small, as long as the weak surface is in a less favorable position or rotates around the end point of the weak surface unit, it will exert a great influence on the unit shear stress from positive or negative, and even change. The symbol of the shear stress generated by the unit. The detailed derivation of the geometrical matrix [B]~e, the element stress matrix [S]~e, the unit stiffness matrix [K]~e, and the equivalent stress caused by the element initial stress considering the influence of the rotation Point load and other calculation formulas. The paper also proves that Goodman’s joint element is a special case of equal-thickness weak surface element—that is, the situation that δ/l tends to zero.