【摘要】：隨著我國經(jīng)濟的高速發(fā)展,對能源的供應(yīng)需求在不斷增大。我國西部地區(qū)水力資源約占全國總量的70%,為了合理利用這些水能資源,我國在西部地區(qū)正在建設(shè)或?qū)⒁ǔ梢幌盗惺澜缂壍母呋炷林亓�。然而壩址地震頻發(fā)且烈度較高,重力壩壩體一旦遭到破壞,將會產(chǎn)生災(zāi)難性的后果。因此,為了確保重力壩的安全,本文采用有限元動力分析方法,以某水電站混凝土重力壩溢流壩段作為研究對象,對高強度地震下混凝土重力壩的動力特性及其抗震安全性進行了深入的研究和探討。主要做了以下幾個方面的研究工作:1、建立有限元模型,對重力壩進行模態(tài)分析,分別求出了空庫和滿庫的固有頻率,分析壩體的自振特性,獲取其自振周期以及結(jié)構(gòu)的振型。2、采用新的地震動參數(shù),運用振型分解反應(yīng)譜法和時程動力法分別對重力壩進行抗震計算,分析了各工況下壩體關(guān)鍵部位的地震動位移和地震動應(yīng)力分布規(guī)律。重點分析了應(yīng)力集中的部位(包括壩踵、壩趾、上下游折坡處、近水面和壩頂),研究了該混凝土重力壩對地震的響應(yīng)規(guī)律;確定結(jié)構(gòu)的薄弱部位,并提出有效可行的抗震加固措施。為指導(dǎo)大壩及其系統(tǒng)的抗震安全運行和工程管理提供科學(xué)依據(jù)。3、運用混凝土塑性損傷模型模擬結(jié)構(gòu)的非線性特性,對典型壩段進行模擬,分析在地震峰值加速度不斷增加時壩體屈服區(qū)域的發(fā)展方向,以及混凝土重力壩的破壞過程和破壞形態(tài),對不同烈度地震作用下壩體裂縫的出現(xiàn)位置、出現(xiàn)范圍與裂縫發(fā)展趨勢進行描述。找出了壩段在強震作用下抗震關(guān)鍵部位和薄弱環(huán)節(jié)。得到了混凝土重力壩在強震作用下的非線性破壞形式,較為真實的反映出壩體的響應(yīng)。4、對基礎(chǔ)進行了穩(wěn)定性驗算,基于振型分解反應(yīng)譜法計算結(jié)果以及基于時程動力法計算結(jié)果,對壩體沿建基面的抗震穩(wěn)定安全進行了深入的探討研究。本論文的工作緊密結(jié)合工程實際,以具體工程為研究背景,其研究成果對設(shè)計及類似工程具有較大的參考和借鑒價值。同時,高地震烈度下混凝土重力壩的動態(tài)反應(yīng)是非常復(fù)雜的問題,其動力分析中一些問題的處理還有待不斷的深入研究。
[Abstract]:With the rapid development of our economy, the demand for energy supply is increasing. In order to make rational use of these hydropower resources, a series of world-class high concrete gravity dams are being constructed or will be built in the western part of China. However, the earthquake occurred frequently and the intensity is high. Once the gravity dam body is destroyed, it will have disastrous consequences. Therefore, in order to ensure the safety of gravity dam, the finite element dynamic analysis method is used to study the overflow section of concrete gravity dam of a hydropower station. The dynamic characteristics and seismic safety of concrete gravity dams under high intensity earthquakes are studied and discussed. This paper mainly studies the following aspects: 1, establishes the finite element model, carries on the modal analysis to the gravity dam, calculates the natural frequency of the empty reservoir and the full reservoir, and analyzes the natural vibration characteristics of the dam body. The natural vibration period and the vibration mode of the structure are obtained. The seismic calculation of gravity dam is carried out by using the new parameters of ground motion, using the mode decomposition response spectrum method and the time-history dynamic method, respectively. The distribution law of ground motion displacement and ground motion stress in key parts of dam body under various working conditions are analyzed. The stress concentration parts (including dam heel, dam toe, upstream and downstream slope break, near water surface and dam top) are analyzed, the response law of the concrete gravity dam to earthquake is studied, and the weak part of the structure is determined. And put forward effective and feasible seismic reinforcement measures. In order to provide scientific basis for seismic safety operation and engineering management of dams and their systems, the concrete plastic damage model is used to simulate the nonlinear characteristics of structures, and the typical dam segments are simulated. This paper analyzes the development direction of dam yield area when the peak acceleration of earthquake increases, the failure process and failure form of concrete gravity dam, and the location of cracks in dam body under the action of different intensity earthquakes. The scope of occurrence and the trend of fracture development are described. The key points and weak links of seismic resistance of dam section under strong earthquake are found out. The nonlinear failure form of concrete gravity dam under strong earthquake is obtained, which reflects the response of dam body. Based on the results of the modal decomposition response spectrum method and the time-history dynamic method, the seismic stability of the dam along the foundation surface is studied. The work of this paper is closely combined with engineering practice, and the research results are of great reference value to design and similar projects. At the same time, the dynamic response of concrete gravity dam under high seismic intensity is a very complex problem, and the treatment of some problems in its dynamic analysis needs to be studied deeply.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV642.3

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