挤压墙工法对面板堆石坝应力变形影响规律研究

Influence on stress and deformation of concrete faced rockfill dam using extrusion-sidewall

利用三维有限元数值模拟方法,分析了采用挤压墙的面板堆石坝的应力变形规律。与不采用挤压墙和采用半挤压墙型式的方案进行比较,研究了挤压墙的存在及其型式对于面板堆石坝应力变形响应的影响。计算结果表明,挤压墙的存在及其型式对于坝体的应力变形以及面板挠度变形影响较小;对面板的应力分布情况有一定影响,但不会对面板安全性产生明显影响;挤压墙的存在有利于减小周边缝的沉陷变位。

The finite element analyses of a concrete faced rockfill dam （CFRD） with and without extrusion-sidewall are carried out using a simplified equivalent numerical model of extrusion-sidewall. Furthermore, a special condition of a CFRD with extrusion-sidewall only on the upper half is considered to investigate the effect of the form of extrusion-sidewall. The analysis is focused on the slab face stress and deformation. Calcalation results show that the distribution of deformation of dam and slab is insignificantly affected by the extrusion- sidewall, and the stress of slab and the settlement of the peripheral joint along the face edge are changed because of the adoption of extrusion-sidewall. The extrusion-sidewall has insignificant effect on the safety of the dam.