土坝及砼防渗墙应力与稳定的非线性有限元分析

NONLINEAR FEM ANALYSIS ON STRESS AND STABILITY OF EARTH-ROCK DAM AND CONCRETE WATER-TIGHT WALL

应用弹性非线性数字模型模拟筑坝土料及地基土的特性,采用逐级加荷的增量法模拟土石坝施工逐步加荷的填筑过程,按有限元法求解坝体、地基及砼防渗墙各荷載步的应力与应变。并提出应用最大剪应变等值线图估计最可能滑坡的位置,计算边坡稳定.可克服人为假定滑动面的弊病。计算实例、成果与原型观测规律符合较好。非线性有限元法可成为设计高土石坝的有力依据。

By simulating the properties of embankment material and foundation earth on an elastical nonlinear model and simulating the step-by-step construction process by increment course, this paper estimates strain and stress in dam, foundation and concrate water-tight wall. A maximum shear-strain isogram method is suggested to eastimate sliding location and stability factor of slope. This method avoids the shortcomings due to assuming slip scope.An example indicates that this method is consistent with site observation. The nonlinear FEM can be an effective basis for high earth-rock dam design.