【摘要】：混合壩是指中間溢流壩段采用混凝土壩,兩側(cè)擋水壩段為土石壩的混合壩型。這種壩型可以充分利用地形條件,而且工程造價也比較經(jīng)濟(jì)。但是混凝土剛度較大,土石壩筑壩材料剛度相對較小,剛度的差別將導(dǎo)致混凝土壩與土石壩的接合面處變形差別大和應(yīng)力分布不均勻。在地震過程中接頭部位的混凝土壩和土石壩具有不同的振動行為。因此,接頭部位容易出現(xiàn)相對沉降和張拉裂縫,是壩體結(jié)構(gòu)的薄弱部位,必須處置妥當(dāng)。 觀音巖水電站位于云南省麗金沙江中游河段,電站采用混合壩構(gòu)成擋水建筑物,混凝土壩與土石壩的結(jié)合部位采用插入式接頭,接頭處高度71m。工程處于高烈度地震區(qū),在地震荷載作甩下接頭部位容易出現(xiàn)錯動位移和張拉裂縫,是大壩的薄弱部位,接頭部位的安全關(guān)系到工程全局。本文以此工程為背景,對其三種插入接頭方案進(jìn)行永久變形計算分析。主要內(nèi)容如下： (1)接觸面的試驗(yàn)研究、本構(gòu)模型和數(shù)值模擬三方面的理論。國內(nèi)外接觸面試驗(yàn)研究的現(xiàn)狀,詳細(xì)分析了常見接觸單元類型的特性,總結(jié)了數(shù)值計算中接觸單元常用的本構(gòu)模型。 (2)建立了觀音巖水電站三維有限元模型,接觸單元采用有厚度Goodman單元,考慮了超余應(yīng)力和嵌入位移對接觸單元本構(gòu)模型的影響,編制了大壩永久變形有限元計算程序。 (3)對觀音巖混合壩插入段直角接頭方案、轉(zhuǎn)角接頭方案、修圓接頭方案進(jìn)行了有限元分析。對計算結(jié)果進(jìn)行了詳細(xì)的對比分析,結(jié)果表明：從接觸面震后法向位移看,修圓接頭方案位移相對較大,直角接頭方案次之,轉(zhuǎn)角接頭方案位移相對較小；從接觸面震后切向位移看,修圓接頭方案相對較大,轉(zhuǎn)角接頭方案次之,直角接頭方案位移相對較小。
[Abstract]:The mixed dam refers to the concrete dam used in the middle overflow dam section and the mixed dam type in which the water retaining dam section on both sides is the earth-rock dam. This kind of dam type can make full use of topographic conditions, and the project cost is also relatively economical. However, the stiffness of concrete is large and the material stiffness of earth-rock dam is relatively small. The difference of stiffness will lead to the large deformation difference and uneven stress distribution between concrete dam and earth-rock dam. During the earthquake, the concrete dam and the earth-rock dam have different vibration behavior. Therefore, the relative settlement and tension cracks are easy to appear in the joint, which is the weak part of the dam structure and must be disposed of properly. Guanyinyan Hydropower Station is located in the middle reaches of the Lisha River in Yunnan Province. the power station adopts mixed dam to form a water retaining structure. The joint of concrete dam and earth-rock dam adopts plug-in joint, and the joint height is 71 m. The project is located in the high intensity seismic area, and the dislocation displacement and tension cracks are easy to appear in the joint under seismic load, which is the weak part of the dam, and the safety of the joint is related to the overall situation of the project. Based on the background of the project, the permanent deformation of the three insertion joint schemes is calculated and analyzed in this paper. The main contents are as follows: (1) the experimental study of contact surface, the theory of constitutive model and numerical simulation. The present situation of contact surface test research at home and abroad is carried out. The characteristics of common contact element types are analyzed in detail, and the common Constitutive models of contact element in numerical calculation are summarized. (2) the three-dimensional finite element model of Guanyinyan Hydropower Station is established. Goodman element with thickness is used in the contact element, and the influence of superstress and embedded displacement on the constitutive model of the contact element is taken into account, and the finite element calculation program of dam permanent deformation is compiled. (3) the finite element analysis of right angle joint, corner joint and round joint of Guanyinyan mixed dam is carried out. The calculated results are compared and analyzed in detail, the results show that from the normal displacement of the contact surface after earthquake, the displacement of the repair round joint scheme is relatively large, the right angle joint scheme is the second, and the angular joint scheme displacement is relatively small; from the contact surface tangential displacement after the earthquake, the repair circular joint scheme is relatively large, the corner joint scheme is the second, and the right angle joint scheme displacement is relatively small.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV64;TV312

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