盾构施工对邻近既有隧道的影响分析
发布时间：2018-12-11 16:32
【摘要】：步入21世纪以来,社会经济蓬勃发展推动了城市建设,城市化进程又导致了城市交通的拥堵,城市地铁建设迫在眉睫。但随着城市地下交通建设的发展,城市地铁线路的增多,往往会遇到盾构隧道施工毗邻或交叉某些既有的隧道。盾构施工会引起周围地层的扰动,导致土体应力状态发生改变,变位地层会导致邻近的隧道发生不均匀沉降、破裂,严重时影响其正常使用。分析盾构施工对邻近既有隧道的影响,总结规律,对盾构施工的正常推进具有重要意义。本文针对合肥地铁南站5号线下穿1号线为工程背景,展开了理论分析、数值模拟和监测数据与模拟对比分析,系统地分析了盾构施工对邻近既有隧道的影响效应与影响规律,主要做了如下几点工作:(1)详细的介绍了本文研究的内容与意义,通过相关的文献调研,总结规律,提出问题,分析现阶段存在但仍未解决的问题,结合本文工程实例确定研究内容与方法。(2)通过理论分析研究,总结盾构施工对周边建(构)筑物影响机理与规律,了解盾构机的工作机理与流程,分析单一洞室与双洞室围岩受力机理,并对二者进行比较,分析二者在同一施工环境下围岩受力的差别。(3)掌握有限元软件的使用方法,根据实际工况建立有限元数值计算模型,通过定义不同的施工工况,对比分析不同竖向距离盾构施工对既有隧道的影响大小,通过对比分析得出最合适的施工距离。(4)通过现场所测的实测数据进行整理分析,然后与理论上的数值模拟计算的结果进行对比分析,从对比分析中找出二者的异同,总结规律,为施工正常进行提供理论的指导,也为类似工程提供相应参考。
[Abstract]:Since the beginning of the 21st century, the vigorous development of social economy has promoted the urban construction, and the urbanization process has led to the congestion of urban traffic, so the construction of urban subway is imminent. However, with the development of urban underground traffic construction, the increase of urban subway lines will often meet the shield tunnel construction adjacent to or crossing some of the existing tunnels. The shield construction will cause disturbance of surrounding strata and change the stress state of soil, and the displacement stratum will lead to uneven settlement and rupture of adjacent tunnels, which will seriously affect their normal use. It is of great significance to analyze the influence of shield construction on adjacent existing tunnels and summarize the rules for the normal advance of shield construction. Based on the engineering background of Hefei South Railway Station Line 5, this paper develops theoretical analysis, numerical simulation and monitoring data and simulation contrast analysis, and systematically analyzes the influence effect and law of shield construction on adjacent existing tunnels. The main work is as follows: (1) introduce the content and significance of this study in detail, through the relevant literature research, summarize the law, put forward the problem, analyze the existing but still unresolved problems at the present stage, Combined with the engineering examples in this paper, the research contents and methods are determined. (2) through theoretical analysis and research, the influence mechanism and law of shield construction on surrounding building (construction) are summarized, and the working mechanism and flow of shield machine are understood. This paper analyzes the stress mechanism of surrounding rock between single and double caverns, compares them, and analyzes the difference between them under the same construction environment. (3) mastering the use of finite element software. According to the actual working conditions, the finite element numerical calculation model is established. By defining different construction conditions, the influence of shield tunneling with different vertical distances on the existing tunnel is compared and analyzed. Through comparative analysis, the most suitable construction distance is obtained. (4) the field measured data are collected and analyzed, and then compared with the results of the theoretical numerical simulation, the similarities and differences between the two are found out from the comparative analysis. Summing up the rules provides theoretical guidance for normal construction, and also provides corresponding reference for similar projects.
【学位授予单位】：安徽建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.43
本文编号：2372869
[Abstract]:Since the beginning of the 21st century, the vigorous development of social economy has promoted the urban construction, and the urbanization process has led to the congestion of urban traffic, so the construction of urban subway is imminent. However, with the development of urban underground traffic construction, the increase of urban subway lines will often meet the shield tunnel construction adjacent to or crossing some of the existing tunnels. The shield construction will cause disturbance of surrounding strata and change the stress state of soil, and the displacement stratum will lead to uneven settlement and rupture of adjacent tunnels, which will seriously affect their normal use. It is of great significance to analyze the influence of shield construction on adjacent existing tunnels and summarize the rules for the normal advance of shield construction. Based on the engineering background of Hefei South Railway Station Line 5, this paper develops theoretical analysis, numerical simulation and monitoring data and simulation contrast analysis, and systematically analyzes the influence effect and law of shield construction on adjacent existing tunnels. The main work is as follows: (1) introduce the content and significance of this study in detail, through the relevant literature research, summarize the law, put forward the problem, analyze the existing but still unresolved problems at the present stage, Combined with the engineering examples in this paper, the research contents and methods are determined. (2) through theoretical analysis and research, the influence mechanism and law of shield construction on surrounding building (construction) are summarized, and the working mechanism and flow of shield machine are understood. This paper analyzes the stress mechanism of surrounding rock between single and double caverns, compares them, and analyzes the difference between them under the same construction environment. (3) mastering the use of finite element software. According to the actual working conditions, the finite element numerical calculation model is established. By defining different construction conditions, the influence of shield tunneling with different vertical distances on the existing tunnel is compared and analyzed. Through comparative analysis, the most suitable construction distance is obtained. (4) the field measured data are collected and analyzed, and then compared with the results of the theoretical numerical simulation, the similarities and differences between the two are found out from the comparative analysis. Summing up the rules provides theoretical guidance for normal construction, and also provides corresponding reference for similar projects.
【学位授予单位】：安徽建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.43
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