發(fā)布時(shí)間：2018-01-05 04:10

  本文關(guān)鍵詞：面板堆石壩新型結(jié)構(gòu)離心模型試驗(yàn)研究　出處：《長(zhǎng)江科學(xué)院》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 面板堆石壩 新型結(jié)構(gòu) 防滲墻 離心模型試驗(yàn) 蓋板 深厚覆蓋層

【摘要】：深厚覆蓋層上建壩面臨壩體沉降大,覆蓋層開挖方量大、耗時(shí)長(zhǎng),棄渣破壞生態(tài)環(huán)境等諸多缺點(diǎn)。有關(guān)學(xué)者針對(duì)在深厚覆蓋層上建壩提出一種“混凝土蓋板”新型面板壩結(jié)構(gòu),即在深厚覆蓋層上增加蓋板,在蓋板上進(jìn)行壩體填筑,蓋板內(nèi)預(yù)留大型廊道用于防滲墻施工,由防滲墻、蓋板及面板形成完整的防滲體系。對(duì)深厚覆蓋層上建壩新型結(jié)構(gòu)的壩體變形展開研究。利用離心模型試驗(yàn)技術(shù)分別研究覆蓋層上未加蓋板、覆蓋層加蓋板和軟弱覆蓋層增加蓋板三組面板壩模型,并結(jié)合有限元數(shù)值分析拓展離心模型試驗(yàn)結(jié)果,得出如下結(jié)論:(1)采用離心模型試驗(yàn)技術(shù)對(duì)面板堆石壩進(jìn)行研究,對(duì)比有限元分析結(jié)果,得出試驗(yàn)結(jié)果符合面板堆石壩的一般性規(guī)律,為面板堆石壩新型結(jié)構(gòu)的理論研究提供設(shè)計(jì)依據(jù)。(2)試驗(yàn)結(jié)果表明在堅(jiān)硬覆蓋層上增加蓋板后減小了壩體在竣工期和蓄水期的沉降;同時(shí),在不同覆蓋層強(qiáng)度條件下,軟弱覆蓋層將引起壩體沉降增大。(3)覆蓋層上未加蓋板時(shí),竣工期防滲墻向上游移動(dòng),蓄水后水荷載引起防滲墻向下游移動(dòng);覆蓋層增加蓋板后,防滲墻變形規(guī)律與未加蓋板規(guī)律一致,但加蓋板減小了防滲墻蓄水期的水平位移。(4)增加蓋板后蓋板竣工期受上部荷載作用中部彎矩較大,蓄水后蓋板在水荷載作用下,蓋板彎矩分配更為均勻。(5)覆蓋層上增加蓋板對(duì)面板應(yīng)變影響較小,竣工期面板受自身重力作用應(yīng)變較小,蓄水期在上部水荷載作用下面板中部偏下位置應(yīng)變值較大。
[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.

【學(xué)位授予單位】：長(zhǎng)江科學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TV641.43

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本文編號(hào)：1381491