大洞径暗挖隧道下穿国铁站场地层沉降控制标准及措施研究

发布时间：2018-03-05 01:18

本文选题：地层沉降　切入点：下穿　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：城镇化促进了城市轨道交通建设快速发展，各种复杂的工程建设条件也不断出现。地铁隧道与既有铁路或站场交叠便是其中之一，在这种情况下，要求地铁施工与国铁运营互不影响，工程建设难度极大。本文针对西安地铁四号线火车站站下穿国铁西安站站场过程中引起的地表沉降这一问题，从隧道下穿施工对列车安全运行、铁路线路不平顺性、铁路路基及轨道三大方面的影响，分析了浅埋暗挖法隧道下穿对铁路线路的影响，，提出了轨道结构变形控制是隧道下穿既有铁路线路沉降控制的根本所在，且隧道下穿施工对轨道结构沉降变形影响较大，而对轨道水平偏差及轨向偏差的影响甚微。将既有铁路线路高低偏差控制规定与铁路线路沉降规律相结合，提出了满足《铁路线路修理规则》规定的，适合于本工程的最大沉降控制标准值及最大沉降速率控制标准值。根据西安地铁相关经验，确定了下穿国铁站场区的浅埋暗挖隧道的施工方案及支护措施，包括“CRD”法及双侧壁导坑法两种工法开挖的两类断面的施工方案及支护措施。通过MIDAS/GTS有限元软件进行数值模拟，对隧道轮廓线外注浆加固圈的合理厚度进行了研究，在满足最大允许地表沉降值及最大地表沉降速率的地表沉降控制标准的前提下，确定“CRD”法及双侧壁导坑法开挖的两类断面达到效果最优、资源最省的加固圈厚度均为2.0m。同时，提出了包括详细的施工措施、下穿前的预防措施以及需要铁路部门配合的工作等一系列隧道下穿国铁站场施工时，可采取的保护措施。针对西安四号线地铁工程的特点，制定了浅埋暗挖隧道下穿国铁站场施工过程中的隧道洞内变形及地表沉降监控量测方案，同时还提出了对站场区铁路线路变形监测方案。论文的研究成果将在西安地铁四号线建设中得到应用、检验和完善。
[Abstract]:Urbanization has promoted the rapid development of urban rail transit construction, and various complex engineering construction conditions are constantly emerging. The overlap of subway tunnels and existing railways or stations is one of them, in this case, The subway construction and the national railway operation are required to have no influence on each other, and the construction of the project is very difficult. This paper aims at the problem of surface settlement caused by the passing through the station yard of Xi'an Railway Station under Xi'an Metro Line 4. From the influence of tunnel underpass construction on train safety, irregularity of railway line, railway subgrade and track, this paper analyzes the influence of shallow tunneling method on railway line. It is put forward that the control of track structure deformation is the foundation of the settlement control of the existing railway line under the tunnel, and the tunnel underpass construction has a great influence on the settlement and deformation of the track structure. However, it has little effect on the horizontal deviation and the rail deviation. Combining the control rules of the high and low deviation of the existing railway lines with the settlement law of the railway lines, the paper puts forward the measures to meet the requirements of the "Railway Line repair rules". The maximum settlement control standard value and the maximum settlement rate control standard value are suitable for this project. According to the relevant experience of Xi'an subway, the construction scheme and supporting measures of the shallow buried underground excavation tunnel under the national railway station area are determined. Including the construction scheme and supporting measures of two kinds of sections excavated by "CRD" method and double-sidewall guide pit method. The reasonable thickness of grouting reinforcement ring outside the tunnel contour is studied by numerical simulation of MIDAS/GTS finite element software. On the premise of satisfying the maximum allowable surface settlement value and the maximum surface settlement rate, it is determined that the two types of sections excavated by "CRD" method and double-side wall guide pit method have the optimum effect, and the thickness of the reinforcement circle with the most economical resources is 2.0 m. at the same time, This paper puts forward a series of protective measures, including detailed construction measures, preventive measures before underpass and the work that the railway department should cooperate with, when the construction of the national railway station under the tunnel is carried out. According to the characteristics of Xi'an Line 4 subway engineering, the monitoring and measuring scheme of tunnel deformation and surface settlement during the construction process of shallow tunneling tunneling through the National Railway Station is established. At the same time, the monitoring scheme of railway line deformation in the station field area is also put forward. The research results of this paper will be applied, tested and perfected in the construction of Xi'an Metro Line 4.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4

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