本文關(guān)鍵詞： 重力壩 運(yùn)行期 溫度場(chǎng) 溫度應(yīng)力　出處：《蘭州交通大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)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(shè)計(jì)方法簡(jiǎn)單，運(yùn)行安全可靠，對(duì)地形、地址條件適應(yīng)性強(qiáng)等特點(diǎn)，被廣泛運(yùn)用，混凝土重力壩溫度應(yīng)力是影響壩體安全的主要因素，所以開(kāi)展該方面的研究具有重要應(yīng)用價(jià)值。 本文以劉家峽水電站主壩Ⅸ非溢流壩段作為工程實(shí)例，采用ANSYS軟件計(jì)算其1月和7月的準(zhǔn)穩(wěn)定溫度場(chǎng)和溫度應(yīng)力，以及在1月準(zhǔn)穩(wěn)定溫度場(chǎng)基礎(chǔ)上計(jì)算寒潮對(duì)大壩溫度場(chǎng)和溫度應(yīng)力的影響，和在7月準(zhǔn)穩(wěn)定溫度場(chǎng)基礎(chǔ)上計(jì)算氣溫日變化對(duì)大壩溫度場(chǎng)和溫度應(yīng)力的影響，主要研究成果如下： （1）對(duì)劉家峽水電站Ⅸ非溢流壩段的溫度場(chǎng)進(jìn)行仿真分析。先計(jì)算模型的邊界條件，再用ANSYS進(jìn)行模擬分析，計(jì)算出1月和7月的準(zhǔn)穩(wěn)定溫度場(chǎng)，1月寒潮期間的瞬態(tài)溫度場(chǎng)和7月氣溫日變化的瞬態(tài)溫度場(chǎng)。 （2）計(jì)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(shí)，壩體向上游傾斜；低溫時(shí)，向下游傾斜，7月位移分量達(dá)到最大，1月時(shí)位移分量達(dá)到最小。 （3）對(duì)劉家峽水電站Ⅸ非溢流壩段的應(yīng)力場(chǎng)進(jìn)行仿真分析。計(jì)算出1月和7月的穩(wěn)定溫度應(yīng)力，1月寒潮期間非穩(wěn)定溫度應(yīng)力及7月氣溫日變化非穩(wěn)定溫度應(yīng)力。在1月低溫時(shí)期，冬季溫度引起的拉應(yīng)力是相當(dāng)大的，接近壩段混凝土的抗拉強(qiáng)度，如果在這個(gè)基礎(chǔ)上加上寒潮，就有可能產(chǎn)生裂縫，7月高溫時(shí)期，溫度荷載引起的應(yīng)力主要是壓應(yīng)力，壩區(qū)晝夜溫差大，混凝土表面溫度和內(nèi)部溫度存在較大的溫度差，將引起相當(dāng)大的應(yīng)力，對(duì)壩體表面不利。氣溫驟降和氣溫日變化對(duì)壩段的影響在表層0.5～1m的范圍內(nèi)，對(duì)其內(nèi)部的溫度影響不大，所以在壩面附近出現(xiàn)應(yīng)力。 本文的研究結(jié)果為劉家峽水電站運(yùn)行期的維護(hù)和補(bǔ)強(qiáng)提供一定的技術(shù)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(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TV642.3;TV315

【參考文獻(xiàn)】

相關(guān)期刊論文 前8條

1 黃達(dá)海,殷福新,宋玉普;碾壓混凝土壩溫度場(chǎng)仿真分析的波函數(shù)法[J];大連理工大學(xué)學(xué)報(bào);2000年02期

2 朱伯芳;RCC壩仿真計(jì)算非均勻單元的初始條件[J];水力發(fā)電學(xué)報(bào);2000年01期

3 朱伯芳;寒潮引起的混凝土溫度應(yīng)力計(jì)算[J];水力發(fā)電;1985年03期

4 朱伯芳;;混凝土拱壩運(yùn)行期裂縫與永久保溫[J];水力發(fā)電;2006年08期

5 朱伯芳;混凝土的彈性模量、徐變度與應(yīng)力松弛系數(shù)[J];水利學(xué)報(bào);1985年09期

6 朱伯芳;彈性徐變體有限元分區(qū)異步長(zhǎng)算法[J];水利學(xué)報(bào);1995年07期

7 何勁,陳堯隆,李守義;寒潮引起的碾壓混凝土壩溫度應(yīng)力計(jì)算[J];西安理工大學(xué)學(xué)報(bào);1999年04期

8 戴躍華;史超;劉先姍;;溫度荷載對(duì)大壩運(yùn)行期位移及應(yīng)力的影響[J];中國(guó)農(nóng)村水利水電;2006年01期

本文編號(hào)：1504691