黄土地区地铁隧道浅埋暗挖法施工地表变形规律研究

发布时间：2018-06-03 20:34

本文选题：浅埋暗挖法 + 地铁隧道　；参考：《西安科技大学》2014年硕士论文

【摘要】：地铁轨道交通是城市的绿色交通工具，是实现城市合理布局的最有效的工具，是缓解城市道路交通压力最有利的工具。在城市中大规模地铁建设的同时，涌现出许多工程技术问题急需解决。如何在地铁隧道施工中预测和有效地控制地表变形，从而保护地铁隧道沿线的已有建筑和地下管路设施的安全，成为了有待解决和研究的一项重要而长期的课题。本文以西安地铁一号线洒金桥～北大街区间隧道为工程背景，针对西安黄土地区地铁隧道施工过程中岩土体的变形特征进行研究。文章以现场监测为基础，采用理论分析和有限元数值模拟相结合的研究方法对黄土地区地铁隧道施工引起的地表变形进行分析研究。通过分析地铁隧道在浅埋暗挖法施工时地表土层变形的机理，，对地铁隧道开挖的过程中地层原始应力的改变、土体的固结沉降、地层的损失等理论进行了综述，并对西安地铁施工中影响地表沉降程度较大的因素进行了分析。运用MIDAS软件建立数值模型，分析地铁隧道在不同施工参数下开挖时对土体变形特征与隧道性状的影响，主要考察岩土体的变形响应、应力分布及地表变形等。根据隧道施工现场的设计施工参数、工程地质条件和环境条件，运用分析软件对西安地铁一号线区间隧道进行了数值模拟，分析了在超前支护开挖过程中，地铁隧道围岩位移变化和围岩应力变化。并且通过现场监测数据分析围岩的变形规律，掌握围岩和支护的动态信息并及时反馈。最后将数值模拟的计算值与现场监测数据进行对比，对地表变形进行分析，验证隧道施工的合理性，为地铁隧道的设计优化与施工工序优化提供科学的依据。
[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.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U231.3;U455.4

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