某盾构下穿北京地铁双线盾构区间结构变形分析及控制研究

发布时间：2018-03-22 03:05

本文选题：盾构　切入点：下穿　出处：《北京交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：随着城市轨道交通网络不断扩大,地上地下空间的利用率逐渐趋于饱和。一些新建地铁线路和市政管线不可避免与既有线路产生交叉,尤其盾构隧道近距离穿越既有地铁盾构区间的工程更是不可避免,其施工难度大、要求高。因此需要系统化研究盾构下穿盾构工程引起的既有地铁结构变形规律和轨道动力响应,从而优化施工控制措施,以保障施工过程中既有地铁的安全运营,这方面的研究对地铁和城市地下工程的发展有着重要的指导意义。本文在查阅大量文献基础上,以某盾构隧道近距离下穿北京地铁双线盾构区间工程实例为研究对象,该工程中盾构隧道距离既有地铁盾构区间竖向净距为6m(1.0D),既有地铁处于盾构强烈影响区,且本工程具有地层条件复杂多变性,工程影响不确定性等特点,但穿越过程中既有地铁结构最大沉降仅为0.98mmm,这是北京地区首次盾构成功穿越既有地铁盾构区间的典型工程。主要研究内容如下： (1)运用ANSYS有限元软件,基于连续介质理论,建立地层—结构三维实体模型,模拟分析盾构下穿施工对既有地铁盾构区间造成的影响。 (2)结合具体实际施工情况,通过重点分析施工过程中的实测数据,并将实测数据与模拟计算结果进行对比,验证模拟计算的准确性,总结盾构施工中的同步注浆及二次注浆等措施对既有地铁区间的影响规律。 (3)基于本工程的成功穿越,结合数值预测和监测数据分析,并参照案例工程的管理流程,初步研究盾构下穿既有盾构工程的风险管理流程；分析归纳盾构下穿地铁工程的主动处理措施和被动处理措施,进而形成一套盾构穿越既有盾构工程的风险控制流程,保障穿越工程的顺利进行。 (4)采用ABAQUS有限元软件,建立车辆—轨道—隧道三维耦合动力分析模型,基于静力分析的计算结果,分析盾构施工产生的轨道结构变形对车辆行走性能和轨道动力特性的影响,为保障既有线路的安全运营提供合理建议。
[Abstract]:Absrtact: with the continuous expansion of urban rail transit network, the utilization ratio of ground and underground space tends to saturate gradually. Some newly built subway lines and municipal pipelines inevitably cross with existing lines. Especially, the project of shield tunnel passing through the shield section of existing subway is inevitable, and its construction is very difficult. Therefore, it is necessary to systematically study the deformation law and track dynamic response of existing subway structures caused by shield tunneling engineering, so as to optimize construction control measures to ensure the safe operation of existing subway during construction. The research in this field is of great significance to the development of subway and urban underground engineering. On the basis of consulting a large number of documents, this paper takes the example of a shield tunnel passing through the double-line shield section of Beijing Metro at close range as the research object. In this project, the vertical net distance between shield tunnel and metro shield section is 6 m ~ (1.0) D ~ (-1), and the subway is in the strong influence area of shield tunneling, and the project is characterized by complex and variable formation conditions and uncertainty of engineering influence, etc. However, the maximum settlement of the existing subway structure is only 0.98 mm m in the course of crossing, which is the first typical project of shield tunneling in Beijing through the existing subway shield section successfully. The main contents of the study are as follows:. 1) using ANSYS finite element software and based on continuum medium theory, a three-dimensional solid model of stratigraphic structure is established, and the influence of tunneling construction under shield tunneling on the existing shield section of metro is simulated and analyzed. 2) combining with the actual construction situation, the accuracy of the simulation calculation is verified by analyzing the measured data in the construction process and comparing the measured data with the simulated calculation results. The effects of synchronous grouting and secondary grouting on the existing metro sections are summarized. 3) based on the successful traversing of the project, combined with numerical prediction and monitoring data analysis, and referring to the management process of the case engineering, the risk management process of the existing shield engineering under shield tunneling is preliminarily studied. This paper analyzes and summarizes the active and passive treatment measures of subway project under shield tunneling, and then forms a set of risk control flow of shield tunneling through existing shield engineering to ensure the smooth progress of the crossing project. In this paper, the three-dimensional coupling dynamic analysis model of vehicle-track-tunnel is established by using ABAQUS finite element software. Based on the calculation results of static analysis, the influence of track structure deformation caused by shield tunneling on vehicle walking performance and track dynamic characteristics is analyzed. Reasonable suggestions are provided to ensure the safe operation of the existing lines.
【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;U231

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