土石坝加宽培厚对坝体位移与心墙应力变化的影响

为考察西南地区某土石坝加宽培厚后坝体的真实工作性态和安全状况,采用三维有限元方法分析了土石坝坝体加宽培厚及蓄水运行时坝体位移、防渗心墙应力与等效塑性应变区域的变化规律。结果表明,坝体沉降最大值发生在加宽培厚土层区域,且坝体出现了向上游与向下游的水平位移,下游贴坡式加宽培厚方式使坝体防渗心墙出现了拉应力与较大区域的等效塑性应变范围,坝体加宽培厚后,需进一步判定坝体培厚土层的稳定性以及心墙的屈服情况与防渗性能。研究成果可供类似工程参考。

Influence of Earth-rockfill Dam Widening and Thickening on Dam Displacement and Core-wall Stress

In order to study the work behavior and safety situation of a certain earth-rockfill dam after thickened in the southwest area, three-dimensional FEM was used to analyze the change law of dam displacement and the stress and PEEQ about the impervious core when the dam has been thickened. The results show that the maximum dam settlement appears in the widening and thickening soil, and the dam exists the horizontal displace from the upstream to downstream. The impervious core will appear tensile stress and the large range of PEEQ when the way of the widening and thickening dam takes the downstream slope widening and thickening dam. After the dam thickened, the slope stability of dam widening and thickening soil must be concerned as well as the core-wall seepage prevention and yielding condition must be studied. The research can provide reference for similar project.