本文選題：面板堆石壩 + 本構(gòu)模型　； 參考：《福州大學(xué)》2014年碩士論文

【摘要】：混凝土面板堆石壩由于其工期短、投資省等眾多優(yōu)點(diǎn)而日益受到壩工界的青睞,并逐漸成為一種極具競(jìng)爭(zhēng)力的壩型。堆石體作為堆石壩的主要組成部分,其本構(gòu)模型的選擇和參數(shù)的確定一直是土石壩數(shù)值分析的難點(diǎn)。當(dāng)前,國(guó)內(nèi)面板壩應(yīng)力變形分析中常用的本構(gòu)模型主要有鄧肯E-B模型、沈珠江雙屈服面模型和多重勢(shì)面模型。由于鄧肯E-B模型模擬的面板底部拉應(yīng)力偏大,沈珠江雙屈服面模型模擬的位移值偏小,因此一種能反映面板壩實(shí)際應(yīng)力和應(yīng)變情況,參數(shù)適用性強(qiáng)且力學(xué)概念簡(jiǎn)單的本構(gòu)模型是有迫切需求的。本文主要工作和成果歸納如下：1.對(duì)堆石體鄧肯E-B模型、沈珠江模型與多重勢(shì)面模型進(jìn)行了評(píng)述與分析�；诒菊n題組提出的多重勢(shì)面模型選用E-B模型的參數(shù),并且用鄧肯模型的加卸載準(zhǔn)則來(lái)判斷多重勢(shì)面模型的加卸載具有很好的優(yōu)越性。本文提出沈珠江模型選用E-B模型的參數(shù),并利用自行開(kāi)發(fā)的面板堆石壩的三維非線性有限元程序,以福建仙游抽水蓄能電站上庫(kù)面板堆石壩為研究對(duì)象,進(jìn)行三維有限元應(yīng)力變形分析,最后將計(jì)算結(jié)果與鄧肯E-B模型、多重勢(shì)面模型選用E-B模型的參數(shù)、多重勢(shì)面模型選用沈珠江模型的參數(shù)、沈珠江模型選用沈珠江模型的參數(shù)、沈珠江模型選用沈珠江模型的參數(shù)并且將卸載泊松比取為0.3、沈珠江模型選用沈珠江模型的參數(shù)并且q值取(?)進(jìn)行比較,突出選用鄧肯E-B參數(shù)的本構(gòu)模型的優(yōu)越性。2.程序中有限元方程解法采用中點(diǎn)增量法,模擬壩體逐級(jí)施工和蓄水的加載過(guò)程。混凝土面板采用線彈性本構(gòu)模型,面板與墊層之間的接觸面、面板垂直縫及周邊縫間止水連接均采用古德曼無(wú)厚度單元模擬。3.最后將運(yùn)用E-B參數(shù)的三種本構(gòu)模型計(jì)算出的沉降量與實(shí)測(cè)數(shù)據(jù)對(duì)比,并將面板應(yīng)力變形值、垂直縫及周邊縫開(kāi)合度與國(guó)內(nèi)外相似工程類(lèi)比,結(jié)果顯示選用E-B模型的參數(shù)的沈珠江模型和多重勢(shì)面模型計(jì)算的堆石體最大沉降量與實(shí)測(cè)吻合較好。計(jì)算的面板垂直縫周邊縫變形值都較小,與同類(lèi)工程相比均在計(jì)算與實(shí)測(cè)范圍內(nèi)。由此可見(jiàn),沈珠江模型選用E-B模型的參數(shù)在混凝土面板堆石壩的應(yīng)力變形分析研究中很好的克服了沈珠江雙屈服面模型計(jì)算的垂直位移偏小,同時(shí)也修正了鄧肯E-B模型計(jì)算的面板底部順坡向出現(xiàn)較大拉應(yīng)力的缺點(diǎn),因此具有很大的發(fā)展前景。
[Abstract]:The concrete face rockfill dam is increasingly favored by the dam industry because of its short construction period and low investment, and has gradually become a very competitive dam type. As the main part of rockfill dam, the selection of constitutive model and the determination of parameters are always the difficulties in numerical analysis of rockfill dam. At present, the constitutive models commonly used in the analysis of stress and deformation of slab dams in China include Duncan E-B model, Shen Zhujiang double yield surface model and multiple potential surface model. Due to the large tensile stress at the bottom of the slab simulated by Duncan E-B model and the small displacement value simulated by the Shen Zhujiang double yield surface model, one can reflect the actual stress and strain of the face slab dam. Constitutive models with strong applicability of parameters and simple mechanical concepts are urgently needed. The main work and achievements of this paper are summarized as follows: 1. The Dunken E-B model, Shen Zhujiang model and multiple potential surface model are reviewed and analyzed. Based on the multiple potential surface model proposed by our team, the parameters of E-B model are selected, and the loading and unloading criteria of Duncan model are used to judge the loading and unloading of multiple potential surface model. In this paper, the parameters of E-B model are selected for Shen Zhujiang model, and the 3D nonlinear finite element program of face rockfill dam developed by ourselves is used to study the upper face rockfill dam of Xianyu pumped Storage Power Station in Fujian Province. Three dimensional finite element analysis of stress and deformation is carried out. Finally, the calculated results are compared with Duncan E-B model, multiple potential surface model with E-B model, multiple potential surface model with Shen Zhujiang model parameter, Shen Zhujiang model with Shen Zhujiang model parameter. The Shen Zhujiang model selects the parameters of the Shen Zhujiang model and takes the unload Poisson's ratio to 0.3, and the Shen Zhujiang model selects the parameters of the Shen Zhujiang model and takes the Q value of the model. The comparison shows that the constitutive model with Duncan E-B parameter is superior. 2. In the program, the midpoint increment method is used to simulate the construction of dam and the loading process of water storage. The linear elastic constitutive model is used in concrete slab. The contact surface between the slab and the cushion and the watertight connection between the vertical joint of the slab and the peripheral joint are simulated by Goodman non-thickness element. Finally, the settlement calculated by using the three constitutive models of E-B parameters is compared with the measured data, and the stress and deformation values of face slab, the opening and closing degree of vertical joints and peripheral joints are compared with similar projects at home and abroad. The results show that the maximum settlement of rockfill calculated by using the Shen Zhujiang model and the multiple potential surface model of E-B model is in good agreement with the measured results. The calculated deformation values of the peripheral joints of the vertical joints of the face plate are smaller than those of the similar projects, and are in the range of calculation and measurement. It can be seen that the parameters of E-B model used in Shen Zhujiang model can overcome the small vertical displacement calculated by Shen Zhujiang double yield surface model in the analysis of stress and deformation of concrete faced rockfill dam. At the same time, the drawback of large tensile stress along the slope direction of the bottom of the panel calculated by Duncan E-B model is corrected, so it has a great development prospect.
【學(xué)位授予單位】：福州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TV641.43

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