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本文论述了六结点直边弱面单元和六结点曲边弱面单元。在分析中除考虑到地质弱面不连续性的特点外,着重研究了岩体转动对弱面的应力和位移带来的影响。文中推导了弱面单位的几何矩阵[B]~6,应力矩阵[S]~6,刚度矩阵[K]~6以及单元初应力引起的等效结点荷载{P}(?)等计算公式。它们有别于一般文献所列算式。计算和分析表明,这种考虑是完全必要的。
This paper discusses the six-node straight edge weak surface element and the six-node curved edge weak surface element. In addition to taking into account the characteristics of the discontinuity of the weak surface in the analysis, the influence of the rotation of the rock mass on the stress and displacement of the weak surface was studied. The equations for the calculation of the geometrical matrix [B]~6, the stress matrix [S]~6, the stiffness matrix [K]~6, and the equivalent node load {P}(?) caused by the element initial stress are deduced in the paper. . They are different from the formulas listed in the general literature. Calculations and analysis show that this consideration is absolutely necessary.