發(fā)布時間：2018-05-06 23:37

  本文選題：鑲嵌面板堆石壩 + 高模量區(qū)　； 參考：《西安理工大學(xué)》2017年碩士論文

【摘要】：隨著我國水電事業(yè)的發(fā)展,修建超高(300m級)混凝土面板堆石壩已成為一種必然趨勢。300m級超高面板堆石壩建設(shè)的關(guān)鍵難題是堆石體變形控制與面板防裂,大量的研究成果表明,壩高從200 m增加到300 m時,壩體變形幾乎增加了 1倍,壩體變形必然會導(dǎo)致面板出現(xiàn)不同程度的裂縫,嚴重危害大壩安全。因此,對常規(guī)面板堆石壩體型進行優(yōu)化設(shè)計,提出鑲嵌面板堆石壩的設(shè)計思路,對300m級超高面板堆石壩的建設(shè)具有重要的意義。本文采用有限元中點增量法對鑲嵌面板堆石壩的應(yīng)力變形特性進行了深入研究,在此基礎(chǔ)上對鑲嵌面板堆石壩高模量區(qū)設(shè)計的方案進行了優(yōu)化,基于正交試驗法對高模量區(qū)鄧肯-張E-B模型參數(shù)進行了敏感性分析,具體研究內(nèi)容及主要結(jié)論如下:(1)針對300 m級超高面板堆石壩建設(shè)的關(guān)鍵難題,本文通過在面板壩上游底部位置設(shè)置壩踵混凝土結(jié)構(gòu),減短面板斜長,來改善面板的應(yīng)力狀態(tài);通過在上游中部位置設(shè)置高模量區(qū),減小堆石體變形,進一步提出了鑲嵌面板堆石壩新壩型的設(shè)計思路。(2)在自重和水荷載作用下,模擬了常規(guī)面板壩、鑲嵌面板壩和設(shè)置高模量區(qū)的鑲嵌面板壩施工過程和蓄水過程,系統(tǒng)的研究了上述三種形式面板堆石壩應(yīng)力變形特性。計算結(jié)果表明,設(shè)置壩踵混凝土結(jié)構(gòu)和高模量區(qū)能夠有效改善壩體及面板的應(yīng)力變形,設(shè)置高模量區(qū)的鑲嵌面板壩對改善壩體及面板的應(yīng)力變形效果最佳,為后續(xù)的研究奠定基礎(chǔ)。(3)對超高鑲嵌面板堆石壩設(shè)計時,在盡可能改善壩體及面板應(yīng)力變形前提下,采用數(shù)值計算的方法對高模量區(qū)起始高程及高度進行優(yōu)化研究,探討了高模量區(qū)對鑲嵌面板堆石壩應(yīng)力變形的影響。計算結(jié)果表明,相比較其它方案,當(dāng)高模量區(qū)起始高程為最大壩高的23%且高度為最大壩高的38%時,壩體及面板的應(yīng)力變形改善效果最為明顯。(4)以高模量區(qū)鄧肯-張E-B模型參數(shù)為研究對象,基于正交試驗法對其進行了敏感性分析,對正交試驗各方案的有限元計算結(jié)果進行極差和方差對比分析。計算結(jié)果表明,參數(shù)Kb對壩體沉降υ3,面板撓度w和順坡向應(yīng)力σ三個指標敏感性高,影響顯著,其次為參數(shù)φ和m ;參數(shù)K、n、Rf及Δφ對上述三個指標敏感性低,影響不顯著。本文的研究成果可為面板堆石壩改善面板應(yīng)力狀態(tài),減小堆石體變形提供參考應(yīng)用價值,為相對較為準確、快捷、符合工程實際地確定堆石體本構(gòu)模型參數(shù)提供了一種思路,對300 m級超高面板堆石壩建設(shè)具有借鑒意義。
[Abstract]:With the development of hydropower industry in our country, it has become an inevitable trend to build a concrete face rockfill dam with 300m) concrete face rockfill dam. The key problems in the construction of 300m super-high face rockfill dam are the deformation control of rockfill body and crack prevention of concrete face slab. A large number of research results show that, When the height of the dam increases from 200 m to 300 m, the deformation of the dam body almost doubles. The deformation of the dam body will inevitably lead to cracks in the face slab, which will seriously endanger the safety of the dam. Therefore, it is of great significance for the construction of 300m super-high face rockfill dam to optimize the shape design of the conventional face rockfill dam and put forward the design idea of the inlaid face rockfill dam. In this paper, the stress and deformation characteristics of the inlaid face rockfill dam are studied by using the midpoint increment method of finite element method, and the design scheme of the high modulus zone of the inlaid face rockfill dam is optimized. Based on the orthogonal test method, the sensitivity of Duncan-Zhang E-B model parameters in high modulus region is analyzed. The specific research contents and main conclusions are as follows: 1) aiming at the key problems in the construction of 300m super-high face rockfill dam, In this paper, the stress state of the slab is improved by setting the concrete structure at the bottom of the dam upstream to reduce the inclined length of the face slab, and the deformation of the rockfill is reduced by setting the high modulus zone in the middle part of the face slab. Furthermore, the design idea of the new type of inlaid face rockfill dam is put forward. Under the action of deadweight and water load, the construction process and the water storage process of the conventional face slab dam, the inlaid face slab dam and the inlaid face slab dam with high modulus are simulated. The stress and deformation characteristics of the above three types of face rockfill dams are systematically studied. The calculation results show that the stress and deformation of dam body and face slab can be effectively improved by setting concrete structure and high modulus zone of dam heel, and the stress and deformation effect of dam body and face slab can be improved by setting inlaid face slab dam with high modulus region. In order to lay a foundation for the further study, the initial height and height of high modulus region are optimized by numerical method under the premise of improving the stress and deformation of dam body and face slab in the design of super-high inlaid face rockfill dam. The influence of high modulus region on stress and deformation of face rockfill dam is discussed. The results show that compared with other schemes, when the initial height of the high modulus region is 23% of the maximum dam height and the height is 38 times the maximum dam height, The improvement effect of stress and deformation of dam body and face slab is most obvious. (4) taking the parameters of Duncan-Zhang E-B model in high modulus region as the research object, the sensitivity analysis of the dam body and face slab is carried out based on the orthogonal test method. The range and variance of the finite element calculation results of each scheme of orthogonal test are compared and analyzed. The calculated results show that the parameter Kb has a high sensitivity to the three indexes of dam settlement v 3, face deflection w and stress 蟽 in the direction of slope direction, followed by the parameters 蠁 and m, and the parameters Knn Rf and 螖 蠁 have low sensitivity to the above three indexes, but the effect is not significant. The research results in this paper can provide a reference value for improving the stress state of the face slab and reducing the deformation of the rockfill, and provide a way of thinking for determining the constitutive model parameters of the rockfill body relatively accurately, quickly and in accordance with the engineering practice. It can be used for reference in the construction of 300m super high face rockfill dam.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV641.43

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