北京某大直径盾构下穿既有地铁桥梁影响研究

发布时间：2018-06-10 00:19

本文选题：大直径盾构 + 穿越　；参考：《北京交通大学》2014年硕士论文

【摘要】：地铁作为城市内交通系统的主要力量,承担了城市大部分的交通客流,其运营安全与否直接关系到乘客的生命安全。为满足城市轨道交通网络化的需求,地铁线路网络格局越加复杂,各类型的穿越施工频繁出现,由于其存在的工程风险和对既有结构造成的影响,日渐成为交通工程中关注的重要环节。盾构法具有较好的智能性、施工安全性、防渗漏水性,对周围环境影响小、易于控制沉降的优点,口前已成为国内外地铁隧道工程建设的主流施工方法,但作为其中一个难点：对于大直径盾构隧道穿越地铁桥梁结构在北京市尚属首次,其规律研究甚少,在新建大盾构隧道工程的施工中,除自身结构安全外,重点目标就是保证其施工对既有桥梁的影响程度降到最低。因此,如何对大直径盾构穿越地铁桥梁工程进行风险评估和准确的分析盾构隧道施工对既有桥梁结构及轨道的变形规律,提出合理的保护措施并分析其效果,继而指导工程施工,保证既有地铁的结构和运营安全,在今后类似的大直径盾构穿越工程中显得尤为重要。本文以北京地铁大直径盾构隧道穿越工程为研究对象,另一个难点在于既有地铁线路变形控制标准高。综合以上两个难点对既有地铁桥梁结构及轨道所受的变形进行分析和总结,提出合理的保护措施体系,为以后大盾构隧道穿越桥梁施工的工程提供借鉴和参考。本文的主要研究工作： (1)在广泛地研究国内外相关文献的基础上,探讨盾构隧道下穿工程的变形机理。根据实际工程,采用数值模拟的方法,运用有限元软件ANSYS分析大直径盾构隧道的施工对既有地铁桥梁和轨道结构的变形影响；对比三种不同工况：未加固条件下、施作钻孔灌注桩方案和施作复合锚杆桩方案对既有地铁桥梁和轨道结构的影响,并总结最佳方案。 (2)根据实际工程的第三方监测数据,对数值模拟的结果进行检验,分析数值模拟方法的正确性及可能存在的问题,并总结既有桥梁结构和轨道结构的变形规律,提出大直径盾构穿越工程施工的风险处理措施,为以后类似的大直径盾构穿越桥梁工程的施工提供借鉴和参考。
[Abstract]:As the main force of the urban transportation system, the subway undertakes most of the passenger flow in the city, and its operation safety or not is directly related to the safety of the passengers. In order to meet the needs of urban rail transit network, the network pattern of subway lines is more and more complicated, and various types of traversing construction occur frequently, because of the engineering risks and the influence on the existing structures. The shield method has the advantages of better intelligence, construction safety, anti-seepage water, less influence on the surrounding environment, and easy to control the settlement. It has become the mainstream construction method of subway tunnel construction at home and abroad, but as one of the difficulties: it is the first time for large diameter shield tunneling to cross subway bridge structure in Beijing, and the research on its law is very few. In the construction of new large shield tunneling project, the key goal is to ensure that the influence of the construction on the existing bridges is minimized, except for the safety of its own structure. Therefore, how to evaluate the risk of large diameter shield tunneling through subway bridge engineering and analyze the deformation law of existing bridge structure and track in shield tunnel construction, put forward reasonable protection measures and analyze its effect. Then guide the construction to ensure the safety of the existing subway structure and operation, which is especially important in the similar large-diameter shield tunneling project in the future. This paper takes the Beijing Metro large-diameter shield tunnel crossing project as the research object. Another difficulty is that the existing subway line deformation control standards are high. Based on the above two difficulties, the deformation of the existing subway bridge structure and track is analyzed and summarized, and a reasonable protective measure system is put forward, which can be used for reference and reference for the construction of large shield tunneling through bridge in the future. The main research work of this paper is as follows: 1) on the basis of extensive research on relevant literature at home and abroad, the deformation mechanism of shield tunneling underpass engineering is discussed. According to the actual engineering, the finite element software ANSYS is used to analyze the deformation effect of the large diameter shield tunnel construction on the existing subway bridge and track structure by using the numerical simulation method, and three different working conditions are compared: under the condition of no reinforcement, The effects of bored cast-in-place pile scheme and composite anchor pile scheme on the existing subway bridge and track structure are summarized and the best scheme is summarized. The results of numerical simulation are tested according to the third party monitoring data of actual engineering. This paper analyzes the correctness of numerical simulation method and the possible problems, summarizes the deformation law of existing bridge structure and track structure, and puts forward the risk treatment measures for large-diameter shield tunneling construction. It provides reference and reference for similar large diameter shield tunneling bridge construction in the future.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43;U448.13

【参考文献】