本文選題：高面板壩　切入點(diǎn)：水布埡　出處：《大連理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國水利水電事業(yè)的飛速發(fā)展,混凝土面板堆石壩的高度被不斷地刷新。現(xiàn)已建成的水布埡面板堆石壩高度為233m,是世界上最高的面板堆石壩,300m級的面板堆石壩目前也在規(guī)劃研究中,而且在建和擬建的混凝土面板堆石壩壩址多坐落在地形、地質(zhì)條件復(fù)雜的地方。隨著壩高的逐漸增加,筑壩規(guī)模的增大,壩體的受力和變形問題變得越來越突出,更好的分析高面板壩的受力和變形對壩體的設(shè)計(jì)和施工顯得至關(guān)重要。 高面板壩的數(shù)值分析是個(gè)相當(dāng)復(fù)雜的非線性有限元問題,采用有限元法求解時(shí),由于高面板壩的結(jié)構(gòu)規(guī)模增大,模型網(wǎng)格數(shù)隨之增多,為了更好地進(jìn)行數(shù)值計(jì)算,如果采取加密措施,網(wǎng)格數(shù)量會更大,給計(jì)算帶來了很大的困難。以前通用的直接法無論在內(nèi)存占用還是求解效率上已經(jīng)難以滿足計(jì)算的需求,為了節(jié)約內(nèi)存、提高計(jì)算速度和精度,需要尋求新的計(jì)算方法,這對高面板壩的數(shù)值模擬不僅具有重大的理論意義,還具有深遠(yuǎn)的工程實(shí)用意義。為了解決這一問題,本文主要做了如下三個(gè)方面的工作： 1.研究了預(yù)處理矩陣的方法、SSOR-PCG法及其改進(jìn)的迭代格式、總體剛度矩陣的存儲技術(shù),然后結(jié)合土石壩有限元靜力計(jì)算的需要,提出了采用行壓縮稀疏格式存儲總體剛度矩陣,SSOR-PCG法改進(jìn)迭代格式求解大型線性方程組的快速求解法及一套快速求解法的編程實(shí)現(xiàn)方案,使用Visual Fortran語言編寫了基于快速求解法的土石壩三維有限元靜力計(jì)算程序。 2.選擇規(guī)則面板堆石壩作為算例,采用不同密度的網(wǎng)格剖分方法,分別得到兩種不同網(wǎng)格數(shù)量的有限元模型,然后分別采用快速求解法和直接法對規(guī)則面板壩模型進(jìn)行有限元分析,驗(yàn)證了快速求解法應(yīng)用到三維有限元計(jì)算程序的正確性,同時(shí)比較兩種求解方法的計(jì)算效率并說明了快速求解法應(yīng)用到大規(guī)模有限元計(jì)算的可行性。 3.以水布埡混凝土面板堆石壩為工程實(shí)例,建立了三維有限元計(jì)算模型,采用本文編寫的程序?qū)λ紙好姘宥咽瘔芜M(jìn)行了有限元計(jì)算,得到不同工況下的受力和變形結(jié)果,并對面板和壩體的應(yīng)力和位移結(jié)果進(jìn)行了分析。
[Abstract]:With the rapid development of water conservancy and hydropower industry in China, The height of concrete face rockfill dam has been constantly refreshed. The height of Shuibuya concrete face rockfill dam is 233m, which is the highest face rockfill dam in the world. Moreover, the sites of concrete face rockfill dams under construction and proposed construction are mostly located in places where the topography and geological conditions are complex. With the increasing of dam height and dam construction scale, the stress and deformation of dam body become more and more prominent. It is very important to analyze the stress and deformation of high-faced dam for the design and construction of dam body. The numerical analysis of high face slab dam is a very complicated nonlinear finite element problem. When the finite element method is used to solve the problem, the grid number of the model increases because of the increase of the structure scale of the high face slab dam, in order to carry out the numerical calculation better. If encryption measures are taken, the number of grids will be larger, which will bring great difficulties to the computation. In order to save memory, it is difficult to satisfy the needs of computation by using the common direct method in memory occupation and efficiency. To improve the calculation speed and precision, we need to find a new calculation method, which is not only of great theoretical significance, but also of far-reaching engineering practical significance for the numerical simulation of high-faced dam. The main work of this paper is as follows:. 1. SSOR-PCG method and its improved iterative format, the storage technology of total stiffness matrix, and the need of finite element static calculation of earth-rock dam are studied. This paper presents an improved iterative method for solving large linear equations by using row compression sparse format to store the total stiffness matrix / SSOR-PCG method. The 3D finite element static calculation program of earth-rock dam based on fast solution method is compiled with Visual Fortran language. 2. Taking regular face rockfill dam as an example, two finite element models with different mesh numbers are obtained by using different density mesh generation method. Then the fast solution method and the direct method are used to analyze the regular face slab dam model respectively, which verifies the correctness of the fast solution method applied to the 3D finite element calculation program. At the same time, the computational efficiency of the two methods is compared and the feasibility of applying the fast solution method to large-scale finite element calculation is illustrated. 3. Taking Shuibuya concrete face rockfill dam as an engineering example, a three-dimensional finite element calculation model is established. The finite element calculation of Shuibuya concrete face rockfill dam is carried out by using the program compiled in this paper, and the results of stress and deformation under different working conditions are obtained. The stress and displacement of face slab and dam are analyzed.
【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】：TV641.43

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