混凝土心墙对砌石拱坝应力和变形的影响分析

Analysis of concrete core stone masonry arch dams

砌石拱坝因其自身优势在我国中小型拱坝中得到广泛的应用,其材料特性使得坝体防渗至关重要,在已建的砌石拱坝中防渗大多采用混凝土心墙,因此,对砌石拱坝中的心墙这一防渗结构型式进行了具体介绍,并建立了混凝土心墙砌石拱坝和均质砌石拱坝的有限元模型并进行计算分析,分别探讨在静、动力条件下心墙拱坝整体和心墙本身的应力变形规律、心墙对整个坝体应力变形规律的影响以及不同心墙材料对坝体影响程度的大小等.由结果可得心墙与坝体上游面应力分布规律基本相同,与上游面极值区对应的心墙处出现明显的应力集中现象,心墙对上下游面的坝体均有一定保护作用,尤其是上游坝踵区,均质砌石拱坝的应力增幅可达100%.

The stone masonry arch dam has been widely built among the small or medium-sized arch dams in China for its own advantages. The material properties make the dam seepage important. The core is usually used in the stone masonry arch dam to prevent seepage. In this paper, the core of masonry dams is introduced in detail. Two numerical models are presented for the finite element analysis, one with a core and the other without ~ core, to research the stress and deformation properties of the concrete core stone masonry arch dam under both static and dynamic conditions; the effect of the core on the whole dam, and the influence of different core materials. According to the finite element analysis, the stress distribution law of the core is as same as the upstream dam face; the core in the masonry arch dam has the problem of stress concentration; the influence of the core on the stress of both upstream and downstream dam face is significant. At the dam heel, the stress of the masonry arch dam without a core increases more than 100 percent.