【作者】 王岩；

【导师】 彭华；

【作者基本信息】 北京交通大学 ， 交通运输工程（专业学位）， 2015， 硕士

【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。更多还原

【Abstract】 With the increasingly intensive distribution of urban subway network, urban municipal engineering is very likely to be affected and intervened by new construction project, such as civil or industrial construction of foundation pit engineering, crossing engineering of underground municipal utilities of heat, electricity, water, drainage and cable, and crossing engineering of traffic facilities of roads, bridges and new rail lines, etc.. Taking Beijing as an example, in recent years during the construction of urban municipal engineering, it is inevitable to face the problem of crossing some existing rail transit line. All these problems are directly connected with both the structure and track of the already existing rail transit, and the normal operations of the existing lines, which pose a serious challenge to the rapid construction and development of urban rail transit. Therefore, they must be properly dealt with.The project of Beijing subway shield undercrossing the existing subway is taken as the research object, The tasks fulfilled in the dissertation are1isted below:(1) Through consulting a large number of related documents at home and abroad, systematic deep summarizes the core content of shield tunnel crossing construction which includes settlement prediction and influencing factor of shield crossing construction from theory and technology.(2) Taking a specificshield tunnel project underneath passing the existing double lines of interval deformation and transfinite as an example, the author analyzes the deformation of the existing shield tunnel, summarizes the deformation laws.(3) Based on the real construction parameters, the author uses ANSYS software to establish3-dimentional entity model in which stimulates how the shield tunnel construction affects the existing double lines shield tunnel. Meantime, under the condition of normal operations of the existing subway, analyzing how shield tunnel excavation influences the deformation of the existing track structure.Compared with the monitoring data, the reliability of the calculation model is to be verified.(4) By analyzing the construction parameters of shield tunneling and simulation results, Summarizing the reasons of transfinite deformation caused by subway shield undercrossing.(5) The last part is to summarize the safety control measures of deformation and transfinite when shield crosses the existing lines, which aims to give advice on typical crossing engineering in terms of safety control measures.更多还原