铁路站场下修建大跨度地铁隧道地表沉降控制技术研究

发布时间：2018-02-25 04:31

本文关键词： 软土隧道下穿铁路站场控制标准沉降规律大断面隧道　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着城市地铁规模的不断扩大,新建暗挖隧道和既有铁路的交叉影响越来越严重,新建地铁采用隧道下穿的方式跨越既有铁路的工程越来越常见。新建暗挖隧道的施工必然引起既有铁路路基和轨道产生变形,影响既有线路的正常运行。因此研究地铁隧道下穿既有铁路引起的沉降变形规律,提出合理的地表沉降控制标准,并以此为控制标准,提出合理隧道施工方法是十分必要的。本文基于国内外已有的下穿工程研究成果的基础上,研究既有线路的沉降变形规律,暗挖隧道对既有线路的影响及破坏模式,参考类似工程既有铁路线路的变形控制指标,并结合铁路相关的安全运营规则,提出了以平顺性为目标的高低偏差控制原则,制定了不同列车速度下允许地表沉降值和允许地表沉降速率控制标准。依托西安火车站站场下的西安地铁4号线大断面隧道工程,系统研究软黄土地层浅埋暗挖隧道施工控制技术。本文首先通过室内模型试验模拟了不同的超前加固方式和施工工法下浅埋暗挖隧道施工过程,通过测量地表沉降、围岩压力、衬砌应力变化,探究暗挖隧道地表沉降、衬砌受力的规律。最后,依据不同的开挖方法、超前加固方式对软黄土地层浅埋暗挖隧道和地表沉降的影响,为依托工程推荐预设计方案。基于预设计方案,借助数值计算方法,对施工过程进行模拟,通过分析施工过程中地层变形及隧道衬砌结构和围岩的应力,预测WSS注浆加固双侧壁导坑法暗挖隧道是否符合地表沉降控制标准,并为西安火车站站场地铁隧道的设计和施工提出建设性意见。
[Abstract]:With the continuous expansion of the scale of urban subway, the cross-influence of new tunnels and existing railways is becoming more and more serious. It is more and more common for the new subway to cross the existing railway by the way of tunnel underpass. The construction of the new underground tunnel will inevitably cause the deformation of the roadbed and track of the existing railway. Therefore, the law of settlement and deformation caused by subway tunnel passing through the existing railway is studied, and a reasonable control standard of ground subsidence is put forward, which is regarded as the control standard. It is very necessary to put forward reasonable tunnel construction method. Based on the existing research results of underpass engineering at home and abroad, this paper studies the law of settlement and deformation of existing lines, the influence of tunneling on existing lines and the failure mode. Referring to the deformation control index of the existing railway lines in similar projects and combining with the relevant safety operation rules of the railway, the control principle of high and low deviation aiming at ride comfort is put forward. The control standards of allowable surface subsidence and allowable surface subsidence rate at different train speeds are established. Based on the large section tunnel project of Xi'an Metro Line 4 under the Xi'an Railway Station Station, This paper systematically studies the construction control technology of shallow underground excavation tunnel in soft yellow soil. Firstly, the paper simulates the construction process of shallow buried underground tunnel under different advanced reinforcement methods and construction methods through indoor model tests, and measures the surface subsidence and surrounding rock pressure. The variation of lining stress, the law of surface settlement and lining force of undercut tunnel are explored. Finally, according to different excavation methods, the influence of advance reinforcement on shallow buried tunnel and surface settlement of soft loess layer is discussed. Based on the pre-design scheme and numerical calculation method, the construction process is simulated, and the deformation of stratum and the stress of tunnel lining structure and surrounding rock are analyzed. It is forecasted whether the double-sidewall tunnel excavation by WSS grouting meets the control standard of surface subsidence, and puts forward some constructive suggestions for the design and construction of subway tunnel in Xi'an Railway Station.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4

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