本文選題：土石壩 + 瀝青混凝土心墻��； 參考：《西安理工大學(xué)》2017年碩士論文

【摘要】：隨著我國(guó)水利開(kāi)發(fā)建設(shè)難度的加大,建設(shè)環(huán)境在朝著低溫、高海拔、多震地帶發(fā)展,瀝青混凝土心墻堆石壩作為能夠適應(yīng)復(fù)雜地質(zhì)條件的一種壩型被廣泛應(yīng)用于我國(guó)西北、西南和東北等自然條件惡劣地區(qū)的水工建設(shè)。為適應(yīng)建設(shè)的新需要,深入研究瀝青混凝土在低溫環(huán)境下的力學(xué)特性和應(yīng)變情況顯得十分迫切。首先,從水工瀝青混凝土的組成結(jié)構(gòu)出發(fā),介紹了各組成材料的作用,通過(guò)檢測(cè)試驗(yàn)選出滿足寒冷地區(qū)工程建設(shè)需要的材料。運(yùn)用單因素分析法處理劈裂試驗(yàn)結(jié)果,綜合分析空隙率、劈裂位移、劈裂強(qiáng)度與油石比、填料濃度、級(jí)配指數(shù)的關(guān)系,選出一組作為三軸試驗(yàn)配合比。其次,設(shè)計(jì)了低溫和常溫共三組三軸試驗(yàn)。試驗(yàn)用兩組常溫試驗(yàn)作為低溫組試驗(yàn)的參照,深入剖析瀝青混凝土在低溫環(huán)境下的力學(xué)特性和應(yīng)力應(yīng)變的規(guī)律。本次試驗(yàn)運(yùn)用Duncan-Chang E-B模型進(jìn)行力學(xué)計(jì)算,摩爾-庫(kù)侖理論為強(qiáng)度破壞準(zhǔn)則。在求解模型參數(shù)K、n和Rf時(shí),根據(jù)應(yīng)力-應(yīng)變曲線特點(diǎn),引用置信度和反算擬合應(yīng)力應(yīng)變曲線對(duì)兩點(diǎn)法、全部法和分段法的適用性進(jìn)行了綜合比較,優(yōu)化K、n和Rf的求解方法,減小了人為因素對(duì)參數(shù)的影響。最終得出結(jié)論:溫度越低,瀝青混凝土的強(qiáng)度越大,選取60%~95%應(yīng)力水平試驗(yàn)點(diǎn)參與計(jì)算的方法最適合計(jì)算低溫瀝青混凝土靜三軸試驗(yàn)力學(xué)模型參數(shù)。最后,以高寒地區(qū)某電站為研究對(duì)象,把不同試驗(yàn)溫度下得到的瀝青混凝土鄧肯-張E-B參數(shù)分別代入有限元模型進(jìn)行計(jì)算,分析不同試驗(yàn)溫度下得到的參數(shù)對(duì)壩體和心墻的應(yīng)力應(yīng)變計(jì)算的影響。結(jié)果表明,低溫組心墻應(yīng)力出現(xiàn)上拱效應(yīng),分析結(jié)果偏于危險(xiǎn),對(duì)混凝土配合比的要求更高。本次研究為瀝青混凝土三軸試驗(yàn)的數(shù)據(jù)處理奠定了一定的理論基礎(chǔ),對(duì)分析溫度對(duì)瀝青混凝土性能的影響有借鑒價(jià)值,所獲得的計(jì)算成果對(duì)同類工程有重要的參考意義。
[Abstract]:With the increasing difficulty of water conservancy development and construction in our country, the construction environment is developing towards low temperature, high altitude and multi-earthquake zone. As a dam type which can adapt to complex geological conditions, bituminous concrete core wall rockfill dam is widely used in northwest China. Hydraulic construction in areas with harsh natural conditions such as southwest and northeast China. In order to meet the new needs of construction, it is very urgent to study the mechanical properties and strain of asphalt concrete in low temperature environment. Firstly, starting from the composition structure of hydraulic asphalt concrete, this paper introduces the function of each component material, and selects the materials to meet the need of engineering construction in cold area by testing and testing. The single factor analysis method is used to deal with the results of split test. The relationship between porosity, split displacement, splitting strength and the ratio of stone to stone, packing concentration and gradation index is analyzed comprehensively, and a group is selected as the mixture ratio of triaxial test. Secondly, three groups of triaxial tests were designed at low temperature and normal temperature. The mechanical properties and stress-strain laws of asphalt concrete under low temperature environment were analyzed by using two sets of normal temperature test as the reference of low temperature group test. In this experiment, Duncan-Chang E-B model is used for mechanical calculation, and Mohr-Coulomb theory is used as strength failure criterion. According to the characteristics of stress-strain curve, the applicability of two-point method, total method and piecewise method are compared synthetically according to the characteristics of stress-strain curve in solving model parameters K _ n and R _ f, and the two point method, the whole method and the piecewise method are compared synthetically, and the solution method of K _ (n) and R _ (f) is optimized. The influence of human factors on the parameters is reduced. Finally, it is concluded that the lower the temperature, the greater the strength of asphalt concrete. The method of 60% 95% stress level test point is the most suitable method to calculate the mechanical model parameters of static triaxial test of low temperature asphalt concrete. Finally, taking a power station in the high and cold region as the research object, the parameters of Duncan Zhang E-B obtained from asphalt concrete at different test temperatures are calculated by means of finite element model. The influence of the parameters obtained at different test temperatures on the calculation of stress and strain of dam and core wall is analyzed. The results show that the stress of low temperature core wall has the effect of upper arch, the analysis result is more dangerous, and the requirement of concrete mix ratio is higher. This study lays a certain theoretical foundation for the data processing of asphalt concrete triaxial test and has reference value for analyzing the influence of temperature on the performance of asphalt concrete. The results obtained are of great reference significance to similar projects.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TV641.41;TV431

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