本文選題：碾壓混凝土重力壩 + 溫度場��； 參考：《蘭州交通大學(xué)》2017年碩士論文

【摘要】：碾壓混凝土重力壩作為一種重要的大體積混凝土水工建筑物,在施工與蓄水過程中必須考慮溫度應(yīng)力問題。溫度應(yīng)力導(dǎo)致的裂縫會影響壩體的安全運行,而且在實際工程中溫度場與應(yīng)力場的變化規(guī)律又不盡相同,因此,溫度應(yīng)力的研究具有較高的科研價值及實用意義。本文建立某碾壓混凝土重力壩三維有限元模型,根據(jù)碾壓混凝土壩實際施工情況及運行資料,對其進(jìn)行施工及蓄水全過程溫度-結(jié)構(gòu)耦合有限元計算分析,進(jìn)行了下述研究:首先利用溫度場有限元計算方法,考慮外界氣溫與水溫、地基初始溫度、水泥水化熱及初始澆筑溫度等因素的影響,分別得到自然澆筑溫度、控制澆筑溫度、自然澆筑溫度+通水冷卻三種方案下壩體施工結(jié)束時刻及蓄水結(jié)束時刻壩體溫度場的分布規(guī)律,對三種方案的溫度場分布規(guī)律及壩體特征點的溫度歷時曲線進(jìn)行比較,分析了各種措施對溫度場變化的影響。且將三種方案下的計算基礎(chǔ)溫差與規(guī)范規(guī)定的允許溫差比較,可以看出控制澆筑溫度與自然澆筑溫度+通水冷卻兩種情況均能滿足溫控要求。根據(jù)特征部位的最大溫度包絡(luò)線說明了三種方案能否滿足溫控要求。接著,根據(jù)三種方案特征部位的溫度應(yīng)力包絡(luò)線與最大拉應(yīng)力云圖,分析了各方案降低溫度應(yīng)力的效果。接著,在控制澆筑溫度場的基礎(chǔ)上得到考慮徐變因素時壩體施工結(jié)束時刻及蓄水結(jié)束時刻三個不同方向的溫度應(yīng)力及第一主應(yīng)力的分布規(guī)律,為了動態(tài)研究三個不同方向的溫度應(yīng)力導(dǎo)致裂縫發(fā)展的規(guī)律,對表面點與中心點的溫度應(yīng)力歷時曲線進(jìn)行了相關(guān)分析。對考慮徐變前后的同一節(jié)點計算所得溫度應(yīng)力曲線進(jìn)行比較,分析了徐變對溫度應(yīng)力的影響。將考慮自重前后特征部位的溫度應(yīng)力值進(jìn)行比較,表明自重減小溫度應(yīng)力的有利作用。最后分析了在自重、水壓力、溫度作用三者共同作用下壩體結(jié)構(gòu)的應(yīng)力分布規(guī)律。
[Abstract]:As an important mass concrete hydraulic structure, RCC gravity dam must consider the temperature stress in the process of construction and storage. The cracks caused by the thermal stress will affect the safe operation of the dam, and the variation laws of the temperature field and the stress field are different in the actual engineering. Therefore, the study of the temperature stress has higher scientific research value and practical significance. In this paper, a 3D finite element model of a roller compacted concrete gravity dam is established. According to the actual construction situation and operation data of the roller compacted concrete dam, the temperature-structure coupling finite element analysis of the construction and the whole process of water storage is carried out. The following studies are carried out: firstly, the natural pouring temperature and the control pouring temperature are obtained by using the finite element method of temperature field, considering the influence of the external temperature and water temperature, the initial temperature of the foundation, the heat of cement hydration and the initial pouring temperature, etc. The distribution law of the temperature field of the dam at the end of construction and the end of water storage under the three schemes of natural pouring temperature, water cooling, and the distribution law of temperature field of the three schemes and the temperature duration curve of the characteristic point of the dam body are compared. The influence of various measures on the temperature field is analyzed. By comparing the basic temperature difference between the three schemes and the allowable temperature difference stipulated in the code, it can be seen that both the controlled pouring temperature and the natural pouring temperature can meet the requirements of temperature control. According to the maximum temperature envelope of the characteristic parts, the three schemes can meet the temperature control requirements. Then, according to the temperature stress envelope and the maximum tensile stress cloud diagram of the characteristic parts of the three schemes, the effect of each scheme to reduce the temperature stress is analyzed. Then, on the basis of controlling the pouring temperature field, the distribution law of the temperature stress and the first principal stress in three different directions of the end time of dam construction and the end time of impoundment are obtained when the creep factor is taken into account. In order to dynamically study the law of crack development caused by three different directions of temperature stress, the curve of thermal stress duration between the surface point and the center point is analyzed. The effect of creep on temperature stress is analyzed by comparing the calculated temperature stress curves of the same node before and after creep. The comparison of the temperature stress values before and after considering the deadweight shows that the self-weight can reduce the temperature stress. Finally, the stress distribution law of dam structure under the action of gravity, water pressure and temperature is analyzed.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV642;TV544.921

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