發(fā)布時間：2018-08-09 08:56

【摘要】：空腹重力壩是一種常見的壩型，即在重力壩壩體內(nèi)設(shè)立一個空腔，既可以節(jié)約壩體混凝土量，又可以減少壩體與壩基的接觸面積，從而減小壩底揚(yáng)壓力。目前國內(nèi)外對空腹重力壩進(jìn)行了大量的結(jié)構(gòu)分析和數(shù)值模擬研究，取得了較好的成果，但大多只針對某工程實例進(jìn)行研究，沒有對其進(jìn)行全面系統(tǒng)的對比分析。尤其是空腹重力壩的斷面形狀及尺寸，直接影響到大壩的應(yīng)力、穩(wěn)定及工程量的大小。目前對不同形狀空腔結(jié)構(gòu)的對比分析、不同高跨比對空腹重力壩壩體應(yīng)力的影響研究還不夠全面和系統(tǒng)，因此有必要進(jìn)行空腹壩斷面體型優(yōu)化研究，為空腹重力壩設(shè)計與施工提供理論依據(jù)。 本文以藍(lán)田岱峪水庫漿砌石空腹重力壩為依托，利用有限元軟件ABAQUS建立多種空腹重力壩斷面模型，進(jìn)行了以下幾方面研究： 1、利用ABAQUS軟件建立了扇形空腔形狀的空腹重力壩模型，進(jìn)行了初始地應(yīng)力場的分析；對比分析了在不同工況下壩體的應(yīng)力大小和位移分布、在工況Ⅱ（設(shè)計洪水位）條件下不同空腹參數(shù)空腹重力壩的應(yīng)力大小及位移分布。 2、利用ABAQUS軟件建立了參數(shù)優(yōu)化的扇形空腔形狀空腹重力壩模型，對比分析了城門洞形以及腹孔上游、下游邊墻均傾向上游型空腔形狀的空腹重力壩在此開孔率下的應(yīng)力大小及位移分布。通過分析，，發(fā)現(xiàn)空腹重力壩和重力壩的受力狀況相同，隨著開孔率的增大，同種空腔形狀的空腹重力壩壩踵和空腔內(nèi)部的拉應(yīng)力呈逐漸增大的趨勢；還要根據(jù)空腹內(nèi)設(shè)置的電站廠房、開關(guān)站、放水閘門等確定空腹的開孔率；空腔內(nèi)的拉壓應(yīng)力主要出現(xiàn)在拱頂偏左以及空腔底部偏右處，若著重考慮受力情況，建議在實際工程施工中選擇腹孔上游、下游邊墻均傾向上游型空腔形狀。若考慮空腔內(nèi)的設(shè)置時，則根據(jù)具體情況而定。 3、分析了各個空腔形狀空腹重力壩的抗滑穩(wěn)定性；結(jié)果表明三種空腔形狀下的空腹重力壩均滿足抗滑穩(wěn)定性要求； 4、依據(jù)模型數(shù)值計算（抗滑穩(wěn)定性、應(yīng)力分布等）的結(jié)果，校核了岱欲空腹重力壩原設(shè)計方案的合理性和可行性，提出了相應(yīng)的修改與完善方案，對該壩壩體體型進(jìn)行了優(yōu)化。
[Abstract]:The hollow gravity dam is a kind of common dam type, that is to say, the establishment of a cavity in the gravity dam body can not only save the amount of concrete in the dam body, but also reduce the contact area between the dam body and the dam foundation, thus reducing the uplift pressure of the dam bottom. At present, a large number of structural analysis and numerical simulation research have been carried out on the hollow gravity dam at home and abroad, and good results have been obtained, but most of them have been studied only for a project case, and no comprehensive and systematic comparative analysis has been carried out on it. Especially, the shape and size of the section of an empty stomach gravity dam directly affect the stress, stability and quantity of the dam. At present, the comparative analysis of hollow cavity structures with different shapes and different ratio of height to span is not comprehensive and systematic enough, so it is necessary to optimize the section shape of the hollow gravity dam. It provides theoretical basis for design and construction of hollow gravity dam. In this paper, based on the slurry hollow gravity dam of Daiyu Reservoir in Lantian County, several cross section models of hollow gravity dam are established by using finite element software ABAQUS. The following aspects are studied: 1. Using ABAQUS software, the model of hollow gravity dam with sector cavity shape is established, and the initial stress field is analyzed, and the stress and displacement distribution of the dam body under different working conditions are compared and analyzed. Under the condition of condition 鈪

本文編號：2173577