發(fā)布時(shí)間：2018-01-15 21:08

  本文關(guān)鍵詞：淺埋大跨隧道穿越建筑物風(fēng)險(xiǎn)分析及控制研究　出處：《重慶交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 大跨隧道 地鐵車站 穿越建筑物 控制研究

【摘要】：城市軌道交通的快速發(fā)展，形成很多隧道穿越建筑物的工程實(shí)例，而淺埋大跨隧道穿越建筑物給施工帶來了更大難度。隧道開挖造成的隧道周圍應(yīng)力應(yīng)變十分復(fù)雜，地表建筑物的存在更是增加了施工的難度。因此，在此類隧道開挖過程中，不僅要考慮隧道自身的穩(wěn)定性，也要考慮到地表建筑物的安全。目前，對(duì)于這類工程的理論研究國(guó)內(nèi)外還不完善，，對(duì)其相互作用機(jī)理還不明確，還處于摸索前進(jìn)的階段，需要全面、系統(tǒng)的研究，以保證施工安全。 本文以重慶軌道交通一號(hào)線沙坪壩車站隧道為依托，采用MIDAS/GTS有限元分析軟件對(duì)該車站隧道開挖過程進(jìn)行數(shù)值模擬計(jì)算，分析各種開挖方法的施工風(fēng)險(xiǎn)，并提出相關(guān)控制措施，分析過程如下： ①通過采用數(shù)值模擬的方法，從臺(tái)階法開挖、CD法開挖、雙側(cè)壁導(dǎo)坑法開挖的不同工況進(jìn)行數(shù)值模擬分析，通過綜合分析不同工況下隧道及圍巖變形、地表沉降、圍巖應(yīng)力變化，找出不同工法的施工風(fēng)險(xiǎn)所在。最終得出雙側(cè)壁導(dǎo)坑法開挖造成的隧道及圍巖變形最小、拱頂及拱腰應(yīng)力最小、開挖過程中圍巖最穩(wěn)定。 ②從改善圍巖的物理力學(xué)性質(zhì)，即改善圍巖的強(qiáng)度、剛度、滲透性的角度出發(fā)，提出各種風(fēng)險(xiǎn)控制措施，達(dá)到降低圍巖應(yīng)力、減少隧道及圍巖變形、降低地表沉降、減少建筑物破壞的目的，保證施工安全順利。 ③結(jié)合該工程施工過程中監(jiān)控量測(cè)數(shù)據(jù)，分析淺埋大跨隧道穿越建筑物風(fēng)險(xiǎn)控制措施的有效性。
[Abstract]:The rapid development of city rail traffic, forming many tunnels through building engineering examples, and the large span shallow tunnel crossing building construction has brought greater difficulty. The surrounding stress and strain is very complicated due to tunnel excavation of tunnel surface buildings are increasing the difficulty of construction. Therefore, in the process of the tunnel excavation that should not only consider the stability of the tunnel itself, also want to consider the safety of surface buildings. At present, for this kind of engineering theory research at home and abroad is not perfect, the interaction mechanism is not clear, is still in the groping stage, the need for a comprehensive, systematic research, to ensure the safety of construction.
Based on the Shapingba station tunnel of Chongqing Rail Transit Line 1, the MIDAS/GTS finite element analysis software is applied to carry out numerical simulation and calculation for the excavation process of the station tunnel, and the construction risk of various excavation methods is analyzed, and the relevant control measures are put forward. The analysis process is as follows:
By using numerical simulation method, the excavation step method, CD method of excavation, numerical simulation analysis of different conditions of excavation method of double side, and through the comprehensive analysis of tunnel surrounding rock under different conditions of deformation, surface subsidence and rock stress changes, and find out the construction risk of different construction methods lies. Finally the double side heading method of tunnel the surrounding rock deformation caused by excavation and minimum, vault and arch waist minimum stress, surrounding rock during excavation is the most stable.
From the physical and mechanical properties improvement of surrounding rock, that is to improve the rock strength and stiffness, the permeability of the point of view, put forward various risk control measures to reduce the stress of surrounding rock and tunnel, reduce the deformation of the surrounding rock, reduce surface subsidence, reduce the damage of the building to ensure the safety of construction smoothly.
Combined with the monitoring data during the construction of the project, the effectiveness of the risk control measures for shallow and large span tunnel crossing the buildings is analyzed.

【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.4

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