重力坝应力-渗流相互作用的无单元耦合分析

Coupled analysis of stress-seepage interaction for gravity dam by element-free method

应用两场交叉迭代解耦技术,建立了应力-渗流相互作用的无单元耦合分析计算模型。详细分析了东方红重力坝在不计应力-渗流耦合和考虑应力-渗流耦合两种情况下,正常蓄水时坝体的位移、应力和渗流位势分布的变化规律。分析表明,考虑耦合作用后,坝体的位移略小,但分布规律一致;坝体的水平正应力分布不同,垂直正应力变化较大,但分布规律一致;耦合作用条件下渗流对重力坝坝体应力的影响是不利的。计算成果符合一般规律。

By the technique of decoupling with two-field iteration,a numerical analysis model is set up for solving the coupled problem of stress-seepage interaction by element-free method.The distribution laws of displacement,stress and seepage piezometric head of dam body and its foundation are analyzed in detail under the normal water level with and without when considering the stress-seepage interaction.It is shown that the displacement of dam under coupled condition is smaller than that of the not one,but their distributions are same.Meanwhile,the distributions of horizontal normal stress are different,and the vertical normal stress and shear stress and seepage equipotential lines are obviously different though their distributions are same too.The seepage flow can result in disadvantageous effect on stress of dam body under coupling condition.The calculation results accord with the general law.