本文關鍵詞： 重力壩 運行期 溫度場 溫度應力　出處：《蘭州交通大學》2014年碩士論文　論文類型：學位論文

【摘要】：混凝土重力壩作為一種重要的壩型，，由于其具有設計方法簡單，運行安全可靠，對地形、地址條件適應性強等特點，被廣泛運用，混凝土重力壩溫度應力是影響壩體安全的主要因素，所以開展該方面的研究具有重要應用價值。 本文以劉家峽水電站主壩Ⅸ非溢流壩段作為工程實例，采用ANSYS軟件計算其1月和7月的準穩(wěn)定溫度場和溫度應力，以及在1月準穩(wěn)定溫度場基礎上計算寒潮對大壩溫度場和溫度應力的影響，和在7月準穩(wěn)定溫度場基礎上計算氣溫日變化對大壩溫度場和溫度應力的影響，主要研究成果如下： （1）對劉家峽水電站Ⅸ非溢流壩段的溫度場進行仿真分析。先計算模型的邊界條件，再用ANSYS進行模擬分析，計算出1月和7月的準穩(wěn)定溫度場，1月寒潮期間的瞬態(tài)溫度場和7月氣溫日變化的瞬態(tài)溫度場。 （2）計算出劉家峽Ⅸ非溢流壩段的位移，高溫和低溫季節(jié)引起壩體位移隨著季節(jié)變化呈現(xiàn)周期性變化，高溫時，壩體向上游傾斜；低溫時，向下游傾斜，7月位移分量達到最大，1月時位移分量達到最小。 （3）對劉家峽水電站Ⅸ非溢流壩段的應力場進行仿真分析。計算出1月和7月的穩(wěn)定溫度應力，1月寒潮期間非穩(wěn)定溫度應力及7月氣溫日變化非穩(wěn)定溫度應力。在1月低溫時期，冬季溫度引起的拉應力是相當大的，接近壩段混凝土的抗拉強度，如果在這個基礎上加上寒潮，就有可能產(chǎn)生裂縫，7月高溫時期，溫度荷載引起的應力主要是壓應力，壩區(qū)晝夜溫差大，混凝土表面溫度和內部溫度存在較大的溫度差，將引起相當大的應力，對壩體表面不利。氣溫驟降和氣溫日變化對壩段的影響在表層0.5～1m的范圍內，對其內部的溫度影響不大，所以在壩面附近出現(xiàn)應力。 本文的研究結果為劉家峽水電站運行期的維護和補強提供一定的技術依據(jù)。
[Abstract]:As an important dam type, concrete gravity dam is widely used because of its simple design method, safe operation, strong adaptability to terrain and address conditions, etc. The thermal stress of concrete gravity dam is the main factor that affects the safety of dam body, so it has important application value to carry out the research in this field. Taking the non-spillway section of the main dam of Liujiaxia Hydropower Station as an engineering example, the quasi-stable temperature field and temperature stress in January and July are calculated by ANSYS software. The influence of cold wave on dam temperature field and temperature stress is calculated on the basis of January quasi-stable temperature field, and the influence of diurnal variation of temperature on dam temperature field and temperature stress is calculated based on July quasi-stable temperature field. The main research results are as follows:. 1) the temperature field in the non-spillway section of Liujiaxia Hydropower Station is simulated and analyzed. The boundary conditions of the model are calculated first, and then the ANSYS is used to simulate and analyze the temperature field. The quasi-stable temperature field on January and July, the transient temperature field during the cold wave of January and the diurnal variation of temperature in January are calculated. (2) the displacement of the non-spillway dam section of Liujiaxia IX is calculated. The displacement of the dam body changes periodically with the seasonal variation of high temperature and low temperature. At high temperature, the dam tilts upstream, and at low temperature, The displacement component reaches the maximum in July and the smallest in January. The stress field of the non-spillway dam of Liujiaxia Hydropower Station has been simulated and analyzed. The steady temperature stress of January and July, the unsteady temperature stress during January cold wave and the diurnal variation of temperature in January have been calculated. The tensile stress caused by winter temperature is quite large, which is close to the tensile strength of concrete in dam block. If the cold wave is added on this basis, cracks may occur. During the high temperature period in July, the stress caused by temperature load is mainly compressive stress. The temperature difference between day and night in the dam area is large, and the temperature difference between the concrete surface temperature and the inner temperature will cause considerable stress, which will be unfavorable to the dam body surface. The sudden drop of temperature and the diurnal variation of temperature will affect the dam section in the range of 0.5m in the surface layer. It has little effect on the internal temperature, so the stress appears near the dam surface. The results of this paper provide some technical basis for the maintenance and reinforcement of Liujiaxia Hydropower Station.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV642.3;TV315

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