本文選題：基坑開挖 + 橋梁　； 參考：《天津大學(xué)》2014年碩士論文

【摘要】：隨著我國高速鐵路的快速建設(shè),越來越多的高速鐵路投入運營。高速鐵路因舒適快捷,已成為人們選擇出行的首要交通工具;正因為如此,其安全運行也至關(guān)重要。目前已經(jīng)開通運營的高速鐵路中橋梁占線路的相當(dāng)份額。所以高速鐵路橋梁附近的施工成為工程界必須考慮的問題,而基坑開挖勢必會對既有高速鐵路橋梁的正常運營產(chǎn)生影響�；娱_挖引起土體位移會對群樁高速鐵路梁橋產(chǎn)生諸多不利影響:第一,土體的水平位移導(dǎo)致樁身變形,進(jìn)而引起橋面水平位移;第二,土體豎直位移引起樁基豎直位移進(jìn)而引起橋面豎直位移;第三,各橋墩和樁基間由承臺和上部結(jié)構(gòu)相互連接彼此之間產(chǎn)生復(fù)雜作用,更加難以估計其變形。本文結(jié)合工程實際,應(yīng)用有限元軟件ABAQUS對某高速鐵路橋附近基坑開挖進(jìn)行三維有限元模擬,并分析其樁、墩沿深度方向的水平側(cè)移、墩頂水平位移和豎直位移。其次,鑒于三維分析中復(fù)雜的建模過程、較高的硬件配置要求和較長的計算時間,本文提出了二維有限元簡化方法,并分別進(jìn)行彈塑性分析。通過三維模型分析結(jié)果和二維模型分析結(jié)果進(jìn)行對比分析,再對不同工況進(jìn)行對比分析。經(jīng)過對比二維簡化方法可用于工程實際的數(shù)值分析。然后對基坑開挖的影響因素的各工況進(jìn)行二維有限元分析,分別分析不同基坑開挖深度、基坑開挖寬度和基坑與既有橋梁的距離對既有橋梁產(chǎn)生的樁、墩沿深度方向的水平側(cè)移、墩頂水平位移和豎直位移的影響。最后對不同基坑開挖方式進(jìn)行二維有限元模擬,分析不同基坑開挖方式各工況的既有橋梁產(chǎn)生的樁、墩沿深度方向的水平側(cè)移、墩頂橫向位移和豎直位移。通過對三維有限元模擬和二維有限元模擬進(jìn)行對比,對類似工程的數(shù)值模擬進(jìn)行計算方法的指導(dǎo);通過對各影響因素的分析和對不同基坑開挖方式各工況的對比,為實際施工方案的確定提供有意義的指導(dǎo)。
[Abstract]:With the rapid construction of high-speed railway in China, more and more high-speed railways are put into operation. High-speed railway has become the most important vehicle for people to travel because of its comfort and speed, and because of this, its safe operation is also very important. At present, the high-speed railway has been opened, bridge accounts for a considerable share of the line. So the construction near the high-speed railway bridge must be considered in the engineering field, and excavation of foundation pit will inevitably affect the normal operation of the existing high-speed railway bridge. The soil displacement caused by excavation of foundation pit will have many adverse effects on the beam bridge of high-speed railway with group piles: first, the horizontal displacement of soil will lead to the deformation of the pile body, and then cause the horizontal displacement of the bridge deck; second, The vertical displacement of soil causes vertical displacement of pile foundation and then causes vertical displacement of bridge deck. Thirdly, the pile pier and pile foundation are connected with each other by cap and superstructure, so it is more difficult to estimate their deformation. In this paper, the finite element software Abaqus is used to simulate the excavation of foundation pit near a high-speed railway bridge. The pile, the horizontal displacement of the pier along the depth, the horizontal displacement of the pier top and the vertical displacement are analyzed. Secondly, in view of the complex modeling process, high hardware configuration requirement and long calculation time in 3D analysis, a two-dimensional finite element simplified method is proposed, and elastic-plastic analysis is carried out respectively. The results of three-dimensional model analysis and two-dimensional model analysis are compared and analyzed. By comparing the two-dimensional simplified method, it can be used in the numerical analysis of engineering practice. Secondly, the influence factors of excavation are analyzed by two-dimensional finite element method, and the piles produced by different excavation depth, excavation width and the distance between foundation pit and existing bridge are analyzed respectively. The horizontal displacement of the pier along the depth direction and the influence of the horizontal displacement and vertical displacement on the top of the pier. Finally, two dimensional finite element simulation of different excavation methods is carried out to analyze the piles produced by existing bridges in different excavation modes, the horizontal lateral displacement of piers along the depth direction, the lateral displacement of the pier top and the vertical displacement. Through the comparison of three-dimensional finite element simulation and two-dimensional finite element simulation, the numerical simulation of similar engineering is guided by the calculation method, and through the analysis of various influencing factors and the comparison of different excavation modes and working conditions, To provide meaningful guidance for the determination of actual construction plan.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU753;U442

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

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本文編號：2029487