接缝止水失效情况下湿化对面板堆石坝应力变形的影响分析

An Analysis of Effects of Wetting Deformations upon CFRD under the Situation of Water Stop Invalidation of Slab Joints

基于改进的湿化变形计算模型,采用邓肯-张的E-B模型模拟大坝的堆石体,对接缝止水失效情况下堆石体湿化变形对混凝土面板应力和变形的影响进行了研究。研究结果表明,由于堆石料的湿化变形影响,使得坝体整体沉降增加并发生向下游的水平位移,同时使得面板的挠度增大,且面板的压应力增量比较大,对面板的应力变形产生不利影响。因此,对坝体先期进行浸水,使主要的湿化变形在面板浇筑前发生,可以改善面板的应力变形状态。所得结果适用于类似工程的设计和施工。

Based on the improved calculation model for wetting deformation, Duncan-Chang E-B model is adopted to simulate the rockfill embankment, this paper studies the effects of wetting deformations upon CFRD under the situation of water stop invalidation of slab joints. The research results indicate that the effect of rockfill material wetting deformations makes the dam embankment settlement increase with the occurrence of level displacement downstream, and at the same time, the face slab winding increases, and the increment of face slab pressure stress is so large that an unfavorable effect upon the face slab stress deformation is generated. For this reason, the rockfill embankment should be soaked in water at the early stage so as to make the wetting deformation take place before the face slab concrete placement in such a way that the face slab stress deformation state can be improved. The results obtained from research can be adoptable to the similar engineering design and construction.