深厚覆盖层上面板堆石坝新型结构应力变形性状影响因素研究

Research on influence factors of stress-deformation behavior of new structure for concrete face rockfill dam on deep overburnden

建设在深厚覆盖层上的高混凝凝土面板堆石坝防渗体系通常采用趾板水平连接混凝土面板和防渗墙,为缩短工期和节省工程投资,建议采用在坝基面处挖除表层部分覆盖层,浇筑混凝土盖板,在盖板内部留有廊道,以便进行防渗墙施工,同时上部填筑坝体的新型结构。采用有限元法对深厚覆盖层上混凝土面板堆石坝新型结构的应力变形性状进行研究。研究盖板长度、盖板分缝、坝基覆盖层加固对面板堆石坝坝体、面板、防渗墙应力变形性状的影响。

The antiseepage system for high concrete face rockfill dam bulit on deep overburnden,is usuallycomposed by concrete connecting plate,plinth,concrete face slab and the diaphragm wall. In order to short-en the construction period and save project investment,a new structure for concrete face rockfill dam ondeep overburnden is proposed,partial overburden should be excavated firstly,then pouring concrete cover,acorridor is reserved in this concrete cover, which makes the construction of diaphragm wall easier. Finite El-ement Method(FEM) is used to analysis the stress-deformation behavior of new structure for concrete facerockfill dam on deep overburnden. The influences of concrete cover plate length, joints of concrete coverplate and the properties of overburnden on the stress-deformation behavior of rockfill dam,concrete faceand the diaphragm wall are studied.