地铁盾构穿越高铁桥群引起沉降的分析及数值模拟

发布时间：2019-01-07 10:28

【摘要】：随着我国社会的不断发展,城市规模越来越大,人口原来密集。很多问题,例如交通拥挤等随之而来。在解决城市交通问题的过程中,地铁拥有很多优点,例如运输量大,速度快,安全,节约土地等,因此得以迅速发展。在此同时,作为我国交通组成的一个重要的组成部分,高铁的发展也极为迅速。综合考虑到日后的地铁修建过程中,很多施工会采用盾构法这种施工方法,由于盾构下穿施工会引起地层的变形,同时也会使高铁轨道产生不平顺现象,对高速铁路的运行造成一定的隐患和安全问题。本文以南京地铁机场线下穿高速铁路桥群作为实际工程背景,通过有限元软件的数值模拟以及与实际监测数据进行对比分析,对盾构不同方法进行开挖和开挖过程对轨道的影响,对地层的作用和列车的动力响应进行了分析研究,全文工作如下:(1)对盾构施工引起的地层变形和沉降做了分析,找出盾构施工引起变形和沉降的主要原因,为进一步的穿越施工提供了正确的思路。(2)利用ABAQUS软件创建了三维有限元模型,研究了不同开挖方式下承台的变形,沉降等数据,对开挖方式的效果和作用做出了分析。(3)利用ABAQUS软件创建了列车,轨道之间的三维模型,将列车运功过程中的振动加速度当做参考量,研究了在不同开挖步下锁造成的振动加速度的数值,并将结果与我国高速铁路设计规范进行对比,得出结论。(4)通过现场监测获得的数据,与数值模拟结果进行对比,进而确定对实际的施工方案进行确定,并证明有限元模拟的合理性。
[Abstract]:With the continuous development of our society, the scale of the city is becoming larger and larger, and the population is dense. Many problems, such as traffic congestion, followed. In the process of solving urban traffic problems, subway has many advantages, such as large volume of transportation, fast speed, safety, saving land and so on, so it can develop rapidly. At the same time, as an important component of China's traffic composition, high-speed rail development is also extremely rapid. Considering comprehensively that in the course of subway construction in the future, many construction methods such as shield tunneling will be used, because the tunneling under shield will cause formation deformation, and at the same time, it will cause irregularity of high-speed railway track. It causes some hidden trouble and safety problems to the operation of high-speed railway. In this paper, taking the high-speed railway bridge group under Nanjing Metro Airport Line as the background of practical engineering, the numerical simulation of finite element software and the comparison with the actual monitoring data are carried out. The influence of excavation and excavation process on track, the action of stratum and the dynamic response of train are analyzed. The main work is as follows: (1) the deformation and settlement caused by shield tunneling are analyzed. Find out the main causes of deformation and settlement caused by shield construction, and provide a correct way of thinking for further crossing construction. (2) the three-dimensional finite element model is created by using ABAQUS software, and the deformation of cap under different excavation modes is studied. The effect and function of the excavation method are analyzed. (3) the three-dimensional model between train and track is created by using ABAQUS software, and the vibration acceleration in the process of train work transportation is taken as the reference value. The numerical value of vibration acceleration caused by different excavation steps is studied, and the results are compared with the design code of high-speed railway in China. (4) the data obtained by field monitoring are compared with the results of numerical simulation. Then the actual construction scheme is determined, and the rationality of finite element simulation is proved.
【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;U231.3;U442

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