面板堆石坝新型结构离心模型试验研究

发布时间：2018-01-05 04:10

本文关键词：面板堆石坝新型结构离心模型试验研究　出处：《长江科学院》2016年硕士论文　论文类型：学位论文

【摘要】：深厚覆盖层上建坝面临坝体沉降大,覆盖层开挖方量大、耗时长,弃渣破坏生态环境等诸多缺点。有关学者针对在深厚覆盖层上建坝提出一种“混凝土盖板”新型面板坝结构,即在深厚覆盖层上增加盖板,在盖板上进行坝体填筑,盖板内预留大型廊道用于防渗墙施工,由防渗墙、盖板及面板形成完整的防渗体系。对深厚覆盖层上建坝新型结构的坝体变形展开研究。利用离心模型试验技术分别研究覆盖层上未加盖板、覆盖层加盖板和软弱覆盖层增加盖板三组面板坝模型,并结合有限元数值分析拓展离心模型试验结果,得出如下结论:(1)采用离心模型试验技术对面板堆石坝进行研究,对比有限元分析结果,得出试验结果符合面板堆石坝的一般性规律,为面板堆石坝新型结构的理论研究提供设计依据。(2)试验结果表明在坚硬覆盖层上增加盖板后减小了坝体在竣工期和蓄水期的沉降;同时,在不同覆盖层强度条件下,软弱覆盖层将引起坝体沉降增大。(3)覆盖层上未加盖板时,竣工期防渗墙向上游移动,蓄水后水荷载引起防渗墙向下游移动;覆盖层增加盖板后,防渗墙变形规律与未加盖板规律一致,但加盖板减小了防渗墙蓄水期的水平位移。(4)增加盖板后盖板竣工期受上部荷载作用中部弯矩较大,蓄水后盖板在水荷载作用下,盖板弯矩分配更为均匀。(5)覆盖层上增加盖板对面板应变影响较小,竣工期面板受自身重力作用应变较小,蓄水期在上部水荷载作用下面板中部偏下位置应变值较大。
[Abstract]:Deep overburden facing dam dam settlement, overburden excavation quantity is large, time-consuming, spoil the destruction of the ecological environment. According to the disadvantages of scholars put forward a "concrete cover" model of dam structure in deep overburden dam, which increase the cover on the deep overburden of dam filling in the cover, on the cover plate for large corridor for anti-seepage wall construction, the anti-seepage wall, seepage control system and form a complete cover panel. Research on dam structure model of dam deformation in deep overburden. Respectively study covering cover layer without using centrifugal model test, covering layer and cover layer and soft cover increase three groups of dam model and finite element numerical analysis results expand centrifugal model test, draw the following conclusions: (1) using centrifuge model test technique to study of CFRD, comparison The results of finite element analysis, the test results accord with the general law of CFRD, provides the design basis for the theoretical research of CFRD model structure. (2) experimental results show that the increase in the hard cover cover layer decreases after the dam in completion period and storage period of precipitation; at the same time, in different overburden strength conditions soft cover, will cause the dam settlement increases. (3) the cover without overburden, completion of anti-seepage wall to move upstream, after the impoundment of water load caused by impermeable wall moves downstream; cover layer increases the cover plate, diaphragm wall deformation and without cover rules consistent, but reduced the impervious wall and cover the water level displacement period. (4) increase the completion period by the back cover of the upper loading central moment is large, the water back under water load, plate bending moment distribution is more uniform. (5) increased to cover the cover layer The influence of panel strain is small, and the strain of the panel is less than that of the panel during the completion stage, and the strain value at the lower part of the panel is larger when the upper water load is applied during the storage period.

【学位授予单位】：长江科学院
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TV641.43

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