【摘要】：城市淺埋軟弱圍巖中暗挖大跨地鐵隧道引起的地表沉降問題一直是地鐵隧道建設者們尤為關(guān)注的話題，同時也是極難控制且亟待解決的關(guān)鍵性問題。在巖土體內(nèi)部暗挖地鐵隧道將不可避免地引起地層變形，當變形達到一定程度時，將對地面建（構(gòu)）筑物及周邊生態(tài)環(huán)境造成嚴重破壞，，甚至危及人民生命財產(chǎn)安全。因此，對隧道施工引起的地表沉降問題進行深入研究，探求不同開挖方法引起的沉降變化規(guī)律，提出切實有效的沉降控制措施，對地鐵隧道的設計、施工和安全運營都具有十分重要的意義。論文主要分析重慶地鐵1號線石歇區(qū)間隧道施工引起的地表沉降問題及數(shù)值模擬研究。 首先，介紹了隧道開挖引起地層移動的主要理論�？偨Y(jié)了城市淺埋軟弱圍巖中修建大跨地鐵隧道引起的地層變形規(guī)律，并詳細闡述了地表橫向變形規(guī)律及縱向變形規(guī)律。 其次，介紹了隧道開挖引起地表沉降的控制原理及對策，并闡述了沉降控制標準及沉降容許值的確定方法。對具體沉降控制措施及其控制效果進行了論述，得出了采用合理的控制措施可有效控制地表沉降的結(jié)論。 再次，介紹了ANSYS軟件在地下工程中的應用，D—P屈服準則及有限單元法的基本分析過程。簡要介紹了依托工程水文地質(zhì)情況，為合理的選取材料參數(shù)做準備，對依托工程采用了不同施工工法數(shù)值模擬及地層預加固法數(shù)值模擬，通過分析比較各個工法的沉降變化情況，得出了雙側(cè)壁導坑法為沉降控制的最佳施工工法的結(jié)論。對最佳施工工法采取加固措施后，結(jié)果表明，地層預加固法的應用可很好地減小地表沉降。 最后，結(jié)合依托工程監(jiān)測數(shù)據(jù),分析了隧道施工引起的地層變形情況，沉降分析結(jié)果與數(shù)值模擬結(jié)果具有一致性，進一步驗證了數(shù)值模擬分析結(jié)果的可靠性，同時也論證了重慶地鐵1號線石歇區(qū)間隧道采用雙側(cè)壁導坑法和地層預加固法施工對地層沉降控制的合理性。
[Abstract]:The problem of surface settlement caused by underground excavation of large-span subway tunnel in shallow buried soft surrounding rock is always a topic of special concern for subway tunnel builders, and it is also a key problem to be solved urgently. Underground tunnel excavation in the body of rock and soil will inevitably cause formation deformation. When deformation reaches a certain degree, it will cause serious damage to ground building and surrounding ecological environment, and even endanger the safety of people's life and property. Therefore, the ground surface settlement caused by tunnel construction is deeply studied, the law of settlement change caused by different excavation methods is explored, and practical and effective settlement control measures are put forward to design the subway tunnel. Construction and safe operation are of great significance. The paper mainly analyzes the surface settlement problem and numerical simulation study caused by the tunnel construction in Shihe section of Chongqing Metro Line 1. Firstly, the main theory of stratum movement caused by tunnel excavation is introduced. This paper summarizes the law of formation deformation caused by the construction of large-span subway tunnel in the shallow buried soft surrounding rock of the city, and expounds in detail the law of transverse and longitudinal deformation of the ground surface. Secondly, the paper introduces the control principle and countermeasures of the ground subsidence caused by tunnel excavation, and expounds the settlement control standard and the method of determining the allowable settlement value. The concrete settlement control measures and their control effects are discussed, and the conclusion is drawn that reasonable control measures can effectively control the surface subsidence. Thirdly, the application of ANSYS software in underground engineering is introduced. This paper briefly introduces hydrogeological conditions of relying engineering, prepares for reasonable selection of material parameters, uses different construction methods numerical simulation and stratum pre-reinforcement numerical simulation for relying engineering. Based on the analysis and comparison of the settlement changes of each method, the conclusion is drawn that the double side wall guide pit method is the best construction method for settlement control. The results show that the application of the pre-reinforcement method can reduce the surface subsidence well. Finally, based on the monitoring data of engineering, the ground deformation caused by tunnel construction is analyzed. The result of settlement analysis is consistent with the result of numerical simulation, which further verifies the reliability of the result of numerical simulation. At the same time, it also proves the rationality of the construction of double-sidewall tunnel and pre-reinforcement method to control the formation settlement in the Shihe section tunnel of Chongqing Metro Line No. 1.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U455;U231.3

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