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  本文關(guān)鍵詞：盾構(gòu)法施工隧道引起地表沉降規(guī)律研究　出處：《石家莊鐵道大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 大直徑 盾構(gòu) 地表沉降 數(shù)值模擬

【摘要】：盾構(gòu)法是城市地下鐵路建設(shè)的一種重要方法,盾構(gòu)法施工也以其安全、快捷等優(yōu)勢在地下工程中廣為應(yīng)用。盾構(gòu)法施工同時也會引起地層變形和地表沉降,尤其在穿越建筑物的時候,如果地表沉降過大將會影響建筑物的正常使用和安全,造成巨大的經(jīng)濟損失和社會影響,因此研究盾構(gòu)施工時的地表沉降規(guī)律具有重要意義。本文為研究盾構(gòu)隧道施工的地表沉降規(guī)律,首先采用文獻分析的方法總結(jié)前人研究成果,歸納盾構(gòu)施工過程中橫向地表沉降和縱向地表沉降的一般規(guī)律,總結(jié)了盾構(gòu)施工過程中不同開挖階段下,地表變形的變化和發(fā)展規(guī)律及影響程度,分析盾構(gòu)掘進造成橫向沉降槽的影響范圍。以天津地下直徑線某工程段為背景,結(jié)合現(xiàn)場的工程地質(zhì)條件,采用MIDAS/GTS軟件建立三維數(shù)值模型,對該地質(zhì)條件下無地表建筑物影響和盾構(gòu)下穿樁基建筑物時的情況建立模型,研究兩種情況下地表沉降規(guī)律,利用模擬結(jié)果分析在地表無任何荷載影響時地表橫向沉降和縱向沉降的規(guī)律;然后分析盾構(gòu)下穿建筑物時地表沉降橫向和縱向的變化規(guī)律,通過比較研究建筑物荷載和樁基礎(chǔ)的存在對地表沉降的影響情況,為盾構(gòu)施工技術(shù)方案提供有效依據(jù)。為了保證隧道通過時建筑物的安全性,在建筑物周邊關(guān)鍵位置布設(shè)監(jiān)測點進行監(jiān)測,比較實測地表沉降量與數(shù)值模擬在相應(yīng)位置的計算結(jié)果。結(jié)果表明,數(shù)值模型的建立和計算參數(shù)的選取是合理的;數(shù)值模擬結(jié)果與實際監(jiān)測結(jié)果相差不大;盾構(gòu)下穿建筑物的過程是安全的,不會影響建筑物的正常使用。該項目的模擬結(jié)果和模擬方法可為工程后續(xù)穿越其他建筑物和風(fēng)險點提供有效的指導(dǎo)和預(yù)測。
[Abstract]:Shield method is an important method in the construction of urban underground railway. The shield method is also widely used in underground engineering because of its advantages of safety and speed. The shield method construction will also cause ground deformation and surface subsidence. Especially in the time of passing through buildings, if the surface settlement is too large, it will affect the normal use and safety of buildings, resulting in huge economic losses and social impact. Therefore, it is of great significance to study the law of ground subsidence in shield tunneling. In order to study the law of ground subsidence in shield tunnel construction, the previous research results are summarized by the method of literature analysis. The general law of horizontal and longitudinal ground subsidence during shield construction is summarized, and the variation and development law of surface deformation and its influence degree in different excavation stages of shield construction are summarized. This paper analyzes the influence range of horizontal settlement trough caused by shield tunneling. Taking a section of Tianjin underground diameter line as the background, combined with the field engineering geological conditions, a three-dimensional numerical model is established by using MIDAS/GTS software. In this paper, a model is established to study the law of ground subsidence under the condition of no influence of surface building under the geological condition and the case of passing through pile foundation building under shield machine. The simulation results are used to analyze the law of the lateral and longitudinal settlement of the surface without any influence of the load on the surface. Then it analyzes the lateral and longitudinal variation of ground surface settlement under shield tunneling, and studies the influence of building load and pile foundation on surface settlement by comparing and studying the influence of building load and pile foundation on surface settlement. In order to ensure the safety of the building when the tunnel passes, monitoring points are set up in the key position around the building. The calculated results of the measured surface subsidence and the numerical simulation are compared. The results show that the establishment of the numerical model and the selection of the calculation parameters are reasonable. The numerical simulation results are not different from the actual monitoring results. The process of passing through the building under shield is safe and will not affect the normal use of the building. The simulation results and simulation method of the project can provide effective guidance and prediction for the subsequent construction through other buildings and risk points.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.43;P642.26

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本文編號：1394713