【摘要】：土石圍堰是保證水電站等其他水下項(xiàng)目干地施工所建的臨時(shí)性擋水建筑物，其安全問題不僅關(guān)系到主體工程的施工進(jìn)度和施工安全，而且還關(guān)系到下游人們的生命安全和財(cái)產(chǎn)安全。在地震區(qū)土石圍堰中的滲流問題以及抗震問題是引起土石圍堰失事的兩個(gè)重要因素。土石圍堰抗震穩(wěn)定性分析的目標(biāo)，是根據(jù)工程破壞特征和破壞機(jī)理提出合理抗震設(shè)計(jì)方法和抗震措施。本文結(jié)合金沙江中游某大壩上游土石圍堰工程，運(yùn)用flac3d數(shù)值軟件進(jìn)行分析，研究了土石圍堰的動(dòng)力反應(yīng)特性及破壞機(jī)理，，論文的主要研究內(nèi)容如下： （1）系統(tǒng)地論述了flac3d的動(dòng)力以及動(dòng)力與滲流耦合的計(jì)算原理和方法，并與有限元結(jié)果相比較，結(jié)果表明：運(yùn)用flac3d進(jìn)行模擬土石圍堰地震反應(yīng)是合理的。 （2）模擬了土石圍堰在動(dòng)力荷載作用下的變形情況，分析了其動(dòng)位移、加速度變化規(guī)律及應(yīng)力分布規(guī)律等動(dòng)力反應(yīng)特性，以及堰體可能出現(xiàn)破壞的位置及整個(gè)堰體的穩(wěn)定性，結(jié)果表明：堰體的豎向位移主要集中在堰頂下方37m處；堰體的水平位移明顯大于基礎(chǔ)的水平位移；堰體的地震破壞是先從堰頂或堰面開始。 （3）模擬了土石圍堰在穩(wěn)定滲流和動(dòng)力荷載耦合作用下的變形情況,分析了其動(dòng)位移、加速度變化規(guī)律及其應(yīng)力分布規(guī)律等動(dòng)力反應(yīng)特性，從而分析堰體在穩(wěn)定滲流與動(dòng)力耦合作用情況下的穩(wěn)定性，結(jié)果表明：豎向位移和水平位移均以土工膜為分界線；必須在堰體迎水面堰頂附近17m范圍內(nèi)采取局部加固。 （4）模擬了土石圍堰在非穩(wěn)定滲流和動(dòng)力荷載作用下的變形情況，分別模擬并分析了水位變化速度為緩變和驟變的情況下與動(dòng)力荷載共同作用時(shí)的動(dòng)位移分布規(guī)律等動(dòng)力反應(yīng)特性，分析了在水位上升和水位下降非穩(wěn)定滲流與動(dòng)力耦合作用情況下堰體的穩(wěn)定性，結(jié)果表明：無論是水位上升或者是下降，與穩(wěn)定水位下相比豎向位移和水平位移最大值增大幅度都相當(dāng)?shù)拿黠@，在水位變化為緩變時(shí)豎向和水平位移最大值增大幅度較大，之后水位變化為驟變時(shí)幅度有所降低。
[Abstract]:Earth-rock cofferdam is a temporary water retaining structure which is built by dry land construction of other underwater projects such as hydropower stations. Its safety is not only related to the construction schedule and construction safety of the main project. And also related to downstream people's lives and property safety. Seepage and seismic problems in earth-rock cofferdam in earthquake area are two important factors that cause the failure of earth-rock cofferdam. The purpose of seismic stability analysis of earth-rock cofferdam is to put forward a reasonable seismic design method and seismic measures according to the damage characteristics and failure mechanism of engineering. Combined with the earth-rock cofferdam project in the upper reaches of a dam in the middle reaches of the Jinsha River, the dynamic response characteristics and failure mechanism of the earth-rock cofferdam are studied by using flac3d numerical software. The main contents of this paper are as follows: (1) the dynamics of flac3d and the calculation principle and method of coupling of dynamic and seepage are discussed systematically, and the results are compared with the results of finite element method. The results show that it is reasonable to use flac3d to simulate the seismic response of earth-rock cofferdam. (2) the deformation of earth-rock cofferdam under dynamic load is simulated and its dynamic displacement is analyzed. The dynamic response characteristics such as acceleration variation law and stress distribution law, the position where the Weir body may be destroyed and the stability of the whole Weir body are discussed. The results show that the vertical displacement of the Weir body is mainly concentrated at 37m below the top of the Weir. The horizontal displacement of the Weir is obviously larger than that of the foundation, and the earthquake failure of the Weir begins from the Weir top or the Weir surface. (3) the deformation of the earth-rock cofferdam under the coupling of steady seepage and dynamic load is simulated. The dynamic response characteristics, such as dynamic displacement, acceleration change and stress distribution, are analyzed, and the stability of Weir under the condition of steady seepage and dynamic coupling is analyzed. The results show that both vertical displacement and horizontal displacement are separated by geomembrane. It is necessary to take local reinforcement within 17m near the top of the Weir. (4) the deformation of earth-rock cofferdam under unsteady seepage and dynamic load is simulated. The dynamic response characteristics of the dynamic displacement distribution under the condition of slow and sudden change of water level and dynamic load are simulated and analyzed respectively. The stability of Weir is analyzed under the condition of unsteady seepage and dynamic coupling of water level rising and water level decreasing. The results show that whether the water level is rising or falling, The maximum values of vertical displacement and horizontal displacement are quite obvious compared with those under steady water level. The maximum values of vertical and horizontal displacements are larger when the water level changes slowly and then decreases when the water level changes to sudden change.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TV551.31

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