深圳地铁九号线某区间隧道地表沉降控制研究

发布时间：2018-01-07 00:27

本文关键词：深圳地铁九号线某区间隧道地表沉降控制研究　出处：《湖北工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：地铁作为便利、绿色环保并且节约城市空间的新型交通工具,正处于高速发展阶段。在修建城市地铁的方法中,盾构技术智能高效、对土体的扰动较小、地质适应性广,得到了广泛地应用。深圳地铁9号线向西村~文锦站盾构区间隧道(简称向文区间)沿线两侧多为住宅小区和商业店铺,施工扰动土体引起的地表沉降会对建筑物产生影响,造成建筑物的倾斜、开裂等,严重时会危害建筑物的正常使用,有时还会危害其结构安全。区间隧道的部分区段上下重叠,最小叠线净距仅2.3m,属于近距离重叠隧道;隧道的最小曲线半径仅345m,属于小曲线半径隧道;隧道左线下穿联城变电站桩基,掘进过程中要切除部分桩基。近距离重叠、小曲线半径和盾构下穿建筑物桩基都是地铁施工中的重难点,各种相互作用复杂、地表沉降控制难度大。本文对向文区间隧道的工程特点进行了分析,确定了该工程地表沉降控制的重难点:地质条件复杂,存在受力复杂、施工难度大的小曲线半径段、近距离重叠段、盾构下穿建筑物桩基段。本文在大量阅读相关文献资料的基础上,学习了类似工程的地表沉降控制措施。针对本区间复合地层的工程特点,结合传统的力学计算方法对地表沉降控制的总体措施进行了研究。本文对向文区间的近距离重叠段、小曲线半径段和盾构下穿联城变电站桩基段分别进行了三维有限元数值模拟分析,依据各难点区段的控制要点针对性地选取分析的侧重点,采用有限元分析软件Midas GTS nx分别建立分析模型,对土体位移、地表沉降规律和管片应力分布状况等进行了分析和研究,对施工方案的可行性进行了判断,提出了相应的优化加强措施。最后对实际施工引起的沉降值进行了监测分析,通过对实测最大沉降和沉降规律的分析,评估了实际施工质量,验证了本文分析方法的准确性和优化措施的有效性,并为今后类似工程的建设积累了宝贵的工程资料。
[Abstract]:Subway as a convenient, green and save urban space of a new type of transportation, is at a high speed development stage. In the construction of urban subway, shield technology intelligent and efficient, less disturbance to the soil. Shenzhen Metro Line No. 9 is located in the shield tunnel of Xicun ~ Wenjin Station (referred to as Xiangwen section) on both sides of residential areas and commercial shops. The surface settlement caused by construction disturbance soil will have an impact on the building, resulting in the building tilt, cracking and so on, which will harm the normal use of the building seriously. Some sections of the interval tunnel overlap up and down, and the minimum net distance of the superimposed lines is only 2.3 m, which belongs to the close overlapping tunnel. The minimum curve radius of the tunnel is only 345m, which belongs to the tunnel with small curve radius. The pile foundation of Liancheng substation is cut off under the left line of tunnel. The short distance overlap, the small curve radius and the tunneling under shield are the most difficult points in the subway construction, and the interaction between each other is complicated. It is difficult to control the surface subsidence. This paper analyzes the engineering characteristics of the tunnel in Xiangwen section, and determines the serious difficulties in the control of the surface subsidence: the geological conditions are complex, and the force is complex. Small curve radius section, close distance overlapping section, shield tunneling under the building pile section. This paper based on a large number of related literature. The paper studies the control measures of surface subsidence of similar engineering, aiming at the engineering characteristics of composite strata in this section. Combined with the traditional mechanical calculation method, the overall measures of surface subsidence control are studied. In this paper, the close overlap section of Xiangwen section is studied. Three dimensional finite element numerical simulation analysis was carried out for the small curve radius section and the pile foundation section of Liancheng substation under shield tunneling, and the emphasis of the analysis was selected according to the control points of each difficult section. The finite element analysis software Midas GTS NX was used to establish the analysis model, and the soil displacement, the law of surface settlement and the stress distribution of segment were analyzed and studied. The feasibility of the construction scheme is judged, and the corresponding optimization measures are put forward. Finally, the settlement caused by the actual construction is monitored and analyzed, and the law of maximum settlement and settlement is analyzed. The actual construction quality is evaluated, the accuracy of the analytical method and the effectiveness of the optimization measures are verified, and valuable engineering data are accumulated for the construction of similar projects in the future.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U456.3;U231.3

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