【摘要】：混合壩是由混凝土壩和土石壩共同組成的壩型,土石壩作為擋水壩段、而混凝土壩兼有擋水和溢流的作用,這種壩型能充分利用當(dāng)?shù)氐匦螚l件,降低工程造價。但是混凝土與土石壩剛度差別較大,應(yīng)力和滲流條件較復(fù)雜,在兩種壩型的連接部位較為薄弱,接頭部位的安全關(guān)乎全局,必須妥當(dāng)處理。滲流與應(yīng)力是相互聯(lián)系相互作用的,二者的耦合計算是目前巖土工程研究的熱門話題。巖土介質(zhì)的互相影響體現(xiàn)在二者的耦合系統(tǒng),因此在進(jìn)行滲流計算時把應(yīng)力考慮進(jìn)來也是十分必要的。通過介紹國內(nèi)外已建混合壩工程實例,結(jié)合混合壩的形式和特點,歸納出混合壩研究及發(fā)展現(xiàn)狀。從滲流達(dá)西定律基本理論出發(fā),對飽和滲流的基本理論、土體滲透系數(shù)及材料非飽和滲透系數(shù)進(jìn)行了研究,以壓力水頭為未知量,導(dǎo)出多孔土體介質(zhì)的飽和非飽和滲流的基本微分方程和其有限元應(yīng)用的數(shù)學(xué)模型。結(jié)合土石壩應(yīng)力分析的鄧肯張本構(gòu)模型,進(jìn)行ANSYS的二次開發(fā),并實現(xiàn)土石壩分層填筑的有限元模擬。以出山店水庫擋水壩段中的連接壩段為例,建立了連接段的三維有限元模型,介紹了插入式混合壩的建模思路和網(wǎng)格劃分方法,提取應(yīng)力、滲流計算所需的節(jié)點、單元、集合、約束等信息。最后對應(yīng)力和滲流的計算結(jié)果進(jìn)行相互迭代來實現(xiàn)耦合,對比考慮耦合與不考慮耦合情況下的滲流場的滲流量、滲流梯度等滲流要素。
[Abstract]:The mixed dam is composed of concrete dam and earth-rock dam. The earth-rock dam is used as the water retaining dam section, and the concrete dam has the functions of water retaining and overflow. This dam type can make full use of the local topographic conditions and reduce the project cost. However, the stiffness of concrete and earth-rock dam is quite different, the stress and seepage conditions are more complex, and the connection part of the two types of dam is relatively weak. The safety of joint part is related to the overall situation and must be properly dealt with. Seepage and stress are interrelated and interacted. The coupling calculation of seepage and stress is a hot topic in geotechnical engineering. The interaction of rock and soil media is reflected in the coupling system, so it is necessary to take stress into account in seepage calculation. By introducing the examples of the construction of hybrid dams at home and abroad and combining the forms and characteristics of hybrid dams, the research and development status of hybrid dams are summarized. Based on the basic theory of Darcy's law of seepage, the basic theory of saturated seepage, the permeability coefficient of soil and the unsaturated permeability coefficient of materials are studied. The basic differential equation of saturated unsaturated seepage in porous soil and the mathematical model of its finite element application are derived. Combined with Duncan Zhang Ben model of earth-rock dam stress analysis, the secondary development of ANSYS is carried out, and the finite element simulation of layered fill of earth-rock dam is realized. Taking the connecting dam section of Qiongshandian Reservoir as an example, the three-dimensional finite element model of the connection section is established, and the modeling idea and mesh division method of the inserted hybrid dam are introduced. The nodes, units and sets needed for stress extraction and seepage calculation are introduced. Constraints, etc. Finally, the calculation results of stress and seepage are iterated to realize the coupling. The seepage flow, seepage gradient and other seepage elements are compared between the coupling and the non-coupling.
【學(xué)位授予單位】：華北水利水電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV223.4

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