本文選題：淺埋暗挖法 + 地鐵隧道�。� 參考：《西安科技大學(xué)》2014年碩士論文

【摘要】：地鐵軌道交通是城市的綠色交通工具，是實(shí)現(xiàn)城市合理布局的最有效的工具，是緩解城市道路交通壓力最有利的工具。在城市中大規(guī)模地鐵建設(shè)的同時，涌現(xiàn)出許多工程技術(shù)問題急需解決。如何在地鐵隧道施工中預(yù)測和有效地控制地表變形，從而保護(hù)地鐵隧道沿線的已有建筑和地下管路設(shè)施的安全，成為了有待解決和研究的一項(xiàng)重要而長期的課題。 本文以西安地鐵一號線灑金橋～北大街區(qū)間隧道為工程背景，針對西安黃土地區(qū)地鐵隧道施工過程中巖土體的變形特征進(jìn)行研究。文章以現(xiàn)場監(jiān)測為基礎(chǔ)，采用理論分析和有限元數(shù)值模擬相結(jié)合的研究方法對黃土地區(qū)地鐵隧道施工引起的地表變形進(jìn)行分析研究。 通過分析地鐵隧道在淺埋暗挖法施工時地表土層變形的機(jī)理，，對地鐵隧道開挖的過程中地層原始應(yīng)力的改變、土體的固結(jié)沉降、地層的損失等理論進(jìn)行了綜述，并對西安地鐵施工中影響地表沉降程度較大的因素進(jìn)行了分析。運(yùn)用MIDAS軟件建立數(shù)值模型，分析地鐵隧道在不同施工參數(shù)下開挖時對土體變形特征與隧道性狀的影響，主要考察巖土體的變形響應(yīng)、應(yīng)力分布及地表變形等。根據(jù)隧道施工現(xiàn)場的設(shè)計(jì)施工參數(shù)、工程地質(zhì)條件和環(huán)境條件，運(yùn)用分析軟件對西安地鐵一號線區(qū)間隧道進(jìn)行了數(shù)值模擬，分析了在超前支護(hù)開挖過程中，地鐵隧道圍巖位移變化和圍巖應(yīng)力變化。并且通過現(xiàn)場監(jiān)測數(shù)據(jù)分析圍巖的變形規(guī)律，掌握圍巖和支護(hù)的動態(tài)信息并及時反饋。最后將數(shù)值模擬的計(jì)算值與現(xiàn)場監(jiān)測數(shù)據(jù)進(jìn)行對比，對地表變形進(jìn)行分析，驗(yàn)證隧道施工的合理性，為地鐵隧道的設(shè)計(jì)優(yōu)化與施工工序優(yōu)化提供科學(xué)的依據(jù)。
[Abstract]:Subway rail transit is the green vehicle of the city, the most effective tool to realize the rational layout of the city, and the most favorable tool to relieve the pressure of urban road traffic. At the same time of large-scale subway construction in the city, many engineering technical problems need to be solved. How to predict and effectively control the surface deformation and protect the safety of existing buildings and underground pipeline facilities along the subway tunnel has become an important and long-term issue to be solved and studied. In this paper, the deformation characteristics of rock and soil in the construction of subway tunnel in Xi'an Loess region are studied with the engineering background of the tunnel between Shanjinqiao and Beidajie of Xi'an Metro Line 1. On the basis of field monitoring, the paper analyzes and studies the surface deformation caused by subway tunnel construction in loess area by the combination of theoretical analysis and finite element numerical simulation. Based on the analysis of the deformation mechanism of the surface soil layer during the construction of the subway tunnel by shallow excavation, the theories of the change of the original stress, the consolidation and settlement of the soil, and the loss of the stratum during the excavation of the subway tunnel are summarized in this paper. The factors that influence the degree of surface subsidence in Xi'an subway construction are analyzed. A numerical model was established by using MIDAS software to analyze the influence of subway tunnel excavation on soil deformation characteristics and tunnel characteristics under different construction parameters. The deformation response, stress distribution and surface deformation of rock and soil were investigated. According to the design construction parameters, engineering geological conditions and environmental conditions of the tunnel construction site, the numerical simulation of Xi'an Metro Line 1 section tunnel is carried out by using the analysis software, and the process of ahead support excavation is analyzed. Displacement change and stress change of surrounding rock in subway tunnel. The deformation law of surrounding rock is analyzed by field monitoring data, and the dynamic information of surrounding rock and support is grasped and feedback is made in time. Finally, the calculated value of numerical simulation is compared with the field monitoring data, the surface deformation is analyzed, and the rationality of tunnel construction is verified, which provides a scientific basis for the optimization of design and construction procedure of subway tunnel.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U231.3;U455.4

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