大型洞室围岩计算中分期施工计算机程序处理

Computer programming in calculation of large cavity surrounding rock by constructing stages

在有限元程序中设置“0”类区和虚单元,程序能自动识别新开挖边界节点号,并通过施加卸荷荷载的方法计算大型地下洞室分期施工各阶段的围岩变形和应力。虚单元不计算单元刚度矩阵,不参与形成总体刚度矩阵。虚节点无节点力,不形成方程。通过标志矩阵自动搜索新的开挖边界节点,并由单元应力计算出节点的卸荷荷载。

Setting "0" type area and void element in finite element program,and automatically recognizing number of the new dogged boundary node,bringing the method of unloading to calculate the transformation of large cavity underground and the stress of surrounding rock by constructing stages.Void element can't be calculated by firm matrix of element,and can't be formed to total firm matrix.Void element hasn't the force of node,and can't form an equation.It can automatically search the node of the new boundary through symbolic matrix,and calculate the unloading of the node by stress of element.