某盾构隧道下穿既有盾构隧道变形超限原因解析及控制研究

发布时间：2018-01-19 10:51

本文关键词： 盾构下穿变形超限数值模拟原因分析控制措施　出处：《北京交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着城市地铁网络的分布日益密集,既有地铁线路极易受到新建穿越工程的影响,如民用或工业建筑基坑工程的施工,市政设施中热力、供电、输水、排水、电缆等地下管线工程穿越,公路、桥梁、新建轨道线路等交通设施的穿越工程等等。以北京为例,近年来在城市交通、市政及房建等工程的建设过程中,也不可避免地出现了一些穿越既有轨道交通线的工程问题,所有这些问题直接关系到既有轨道交通结构和轨道的安全,可能会影响既有线的正常运营,对于我国城市轨道交通的快速建设和发展提出了严峻的挑战,必须妥善解决。本文以北京某盾构隧道下穿既有地铁盾构隧道工程实例为依托,主要开展研究工作如下： (1)通过大量查阅国内外相关文献资料,对盾构穿越施工所涉及的核心内容,主要包括盾构穿越施工沉降预测、盾构施工引起沉降的影响因素两个方面,从理论和技术上进行深入系统的总结。 (2)以北京某盾构下穿既有双线盾构隧道区间变形超限工程为例,结合监测数据与检测结果,分析既有盾构隧道的变形现状,并总结变形规律。 (3)以实际施工参数为基础,利用ANSYS软件建立三维实体模型,模拟盾构隧道施工过程中对既有双线盾构隧道的影响。分析在既有地铁保持运营的情况下,盾构法隧道在实际开挖中对既有地铁轨道结构的变形情况。并与监测数据进行对比,验证计算模型的可靠性。 (4)分析盾构掘进施工参数,并结合模拟计算结果,总结盾构穿越施工引起既有隧道结构变形超限的原因。 (5)总结分析盾构穿越既有线的变形超限时的安全控制措施,为类似穿越工程提供安全控制措施方面的建议。
[Abstract]:With the increasingly dense distribution of urban subway network, existing subway lines are vulnerable to the impact of new crossing projects, such as civil or industrial construction of foundation pit construction, municipal facilities in the heat, power supply, water transmission, drainage. In recent years, taking Beijing as an example, in the construction of urban traffic, municipal and housing construction, etc. It is inevitable that there are some engineering problems of crossing the existing rail transit line, all of which are directly related to the structure and track safety of the existing rail transit, and may affect the normal operation of the existing railway line. It poses a severe challenge to the rapid construction and development of urban rail transit in China, which must be solved properly. Based on the example of an existing subway shield tunnel under a shield tunnel in Beijing, the main research work of this paper is as follows: 1) through consulting a large number of domestic and foreign related literature, the core contents of shield tunneling construction, mainly including the shield tunneling construction settlement prediction, shield construction caused by the settlement of two aspects. From the theoretical and technical aspects of the in-depth and systematic summary. (2) taking a shield tunneling tunnel under Beijing as an example, combined with monitoring data and testing results, the deformation status of existing shield tunnel is analyzed, and the deformation law is summarized. Based on the actual construction parameters, the 3D solid model is established by using ANSYS software. The influence of shield tunnel construction on existing double-line shield tunnel is simulated. In the actual excavation of the shield tunnel, the deformation of the existing subway track structure is analyzed and compared with the monitoring data to verify the reliability of the calculation model. 4) analyzing the construction parameters of shield tunneling, and combining with the result of simulation calculation, summing up the causes of the deformation of the existing tunnel structure caused by the shield tunnel crossing construction. 5) summarizing and analyzing the safety control measures when the deformation of the existing railway is exceeded by shield tunneling, and providing some suggestions on safety control measures for similar crossing projects.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.43

【引证文献】