本文選題：重力壩 + 非線性　； 參考：《大連理工大學(xué)》2014年碩士論文

【摘要】：隨著社會的發(fā)展和經(jīng)濟(jì)的進(jìn)步,我國對能源的需求愈加迫切。我國是世界水利大國,外加水電具有低碳、清潔能源等優(yōu)勢,水電事業(yè)具有廣闊的開發(fā)前景。目前在我國西南高烈度地區(qū)在建和規(guī)劃了一大批百米級大壩和超高的大壩,混凝土重力壩的抗震研究工作尤為重要,因此本文結(jié)合某碾壓混凝土重力壩工程,運(yùn)用ANSYS和ABAQUS有限元程序?qū)χ亓蔚牡卣痦憫?yīng)以及抗震計算工作做了如下研究： 1、針對地基邊界的選取,選取了無質(zhì)量地基剛性約束、具有剛度特性和阻尼特性的粘彈性邊界、有限元-無限元耦合三種不同的邊界條件。針對不同的邊界條件進(jìn)行靜力和動力的算例驗(yàn)證,通過與彈性力學(xué)理論解和相關(guān)波動理論來驗(yàn)證程序施加邊界條件的正確性。 2、在線彈性模型的基礎(chǔ)上,采用三種不同的邊界條件,計算碾壓混凝土重力壩工程實(shí)例在地震荷載作用下的時程響應(yīng),并從應(yīng)力、位移及動力穩(wěn)定三個方面評價了不同邊界條件的響應(yīng)特性及適用邊界條件,計算結(jié)果表明無質(zhì)量地基剛性約束邊界的動響應(yīng)較大,粘彈性邊界和無限元邊界對地震波反射的吸能效果較好,且計算精度相當(dāng),但是無限元邊界在計算時間上比較節(jié)省,計算效率較高。 3、選用無限元-有限元耦合的模型,綜合考慮混凝土材料以及巖土材料的非線性特性,采用ABAQUS提供的粘聚力模型(cohesive)模擬碾壓混凝土層間以及地基中軟弱結(jié)構(gòu)面的接觸問題。對比線彈性模型,從應(yīng)力響應(yīng)、位移響應(yīng)以及抗滑穩(wěn)定性角度研究考慮材料非線性和接觸之后的結(jié)構(gòu)動力響應(yīng)。 4、應(yīng)用有限元方法計算的應(yīng)力結(jié)果,分別采用規(guī)范推薦的分項(xiàng)系數(shù)法和強(qiáng)度折減法對碾壓混凝土層間抗滑穩(wěn)定以及深層抗滑穩(wěn)定的安全性進(jìn)行分析評價。研究表明,針對雙滑面整體彎矩法計算所得的安全系數(shù)要比等K法略大；降強(qiáng)法得到的安全系數(shù)與分項(xiàng)系數(shù)法比較接近。建議綜合考慮各方法的計算結(jié)果進(jìn)行壩體和壩基的動力失穩(wěn)評判。
[Abstract]:With the development of society and the progress of economy, the demand for energy in our country is more and more urgent. China is a big water conservancy country in the world, and hydropower has the advantages of low carbon, clean energy and so on. At present, a large number of 100-meter dams and super-high dams are under construction and planning in the high intensity area of southwest China. The seismic research work of concrete gravity dams is particularly important, so this paper combines with a roller compacted concrete gravity dam project. Using ANSYS and ABAQUS finite element program, the earthquake response and seismic calculation of gravity dam are studied as follows: 1. According to the selection of foundation boundary, three kinds of boundary conditions are selected, which are rigid constraint, viscoelastic boundary with stiffness and damping characteristics, and the coupling of finite element and infinite element. Examples of static and dynamic tests are given for different boundary conditions. The correctness of the boundary conditions imposed by the program is verified by the theoretical solution of elastic mechanics and the related wave theory. 2. On the basis of the online elastic model, three different boundary conditions are used to calculate the time-history response of the RCC gravity dam project under earthquake load. The response characteristics and applicable boundary conditions of different boundary conditions are evaluated from three aspects of displacement and dynamic stability. The results show that the dynamic response of rigid constrained boundary is large. The viscoelastic boundary and infinite element boundary have good energy absorption effect on seismic wave reflection, and the calculation accuracy is equal, but the infinite element boundary is less in calculation time and higher in efficiency. 3. The coupling model of infinite element and finite element is used to simulate the contact problem of soft structural plane between roller compacted concrete layers and foundation by considering the nonlinear characteristics of concrete and geotechnical materials. The cohesive force model provided by ABAQUS is used to simulate the contact between RCC layers and soft structures in foundation. Compared with the linear elastic model, the dynamic response of the structure considering material nonlinearity and contact is studied from the stress response, displacement response and anti-slip stability. 4. The stress results calculated by finite element method are used to analyze and evaluate the safety of roller compacted concrete (RCC) interlayer stability and deep layer anti-sliding stability by the method of subdivision coefficient and strength reduction recommended by the code. The results show that the safety factor calculated by the integral bending moment method for double sliding surfaces is slightly larger than that by the equal K method, and the safety factor obtained by the strength reduction method is close to that obtained by the partial factor method. It is suggested that the dynamic instability of dam body and foundation should be evaluated by considering the calculation results of each method.
【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】：TV642;TV312

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