城际轨道交通下穿燃气管道振动影响研究

发布时间：2019-04-29 06:10

【摘要】：随着经济的不断发展,城市生活水平的不断提升,城市交通问题日益凸显,地面交通趋于饱和的情况下,开发利用地下资源成为许多大中城市发展的必然选择。然而地铁列车的长期振动不可避免的对周围环境、建筑产生影响,如何准确地预测列车运行对周围环境的影响,并对影响作出合理的评价,显得尤为重要。本文以东莞至惠州城际轨道交通项目下穿莞太立交新奥燃气管道工程为研究对象,对其在运行过程中产生的振动影响进行评估分析,并提出相应的防治措施。主要研究成果如下：1.根据拟建工程的实际情况选择了最不利工况,确定了最不利工况的模型几何参数和物理力学参数,应用有限元软件ANSYS建立了包括轨道、隧道结构、土体和管道的三维有限元模型；2.以钢轨扣件反力作为输入荷载,研究了列车运营条件下燃气管道的振动响应特性,并分析了会车对燃气管道的振动响应特性的影响。计算结果表明,燃气管道的振动随着运营速度的提高而增大,当运营速度为200 km/h时,燃气管道的最大振动加速度为1.17×10-3m/s2。如果在管道下方会车,燃气管道的振动影响范围显著增大,其加速度幅值位移和加速度幅值增幅分别为84%和76%,最大位移2.2×10-Sm,最大振动加速度为0.0021m/s2。3.过类比分析,建立了列车振动烈度表,根据预测计算结果判断,本项目列车运营时不会对下穿燃气管道产生振动影响,可以保证管道的正常运营。
[Abstract]:With the continuous development of economy and the improvement of urban living standard, urban traffic problems are becoming increasingly prominent, and the exploitation and utilization of underground resources has become the inevitable choice for many large and medium-sized cities under the condition that the ground traffic tends to become saturated. However, the long-term vibration of the subway train inevitably affects the surrounding environment and buildings. How to accurately predict the impact of the train operation on the surrounding environment and make a reasonable assessment of the impact is particularly important. Taking Dongguan-Huizhou intercity rail transit project as the research object, this paper evaluates and analyzes the vibration effect of Dongguan-Huizhou intercity rail transit project, and puts forward the corresponding prevention and cure measures. The main research results are as follows: 1. According to the actual situation of the proposed project, the most unfavorable working conditions are selected, the geometric parameters and physical and mechanical parameters of the most unfavorable working conditions are determined, and the track and tunnel structures are established by using the finite element software ANSYS. Three-dimensional finite element model of soil and pipeline; 2. Taking the reaction force of rail fastener as input load, the vibration response characteristics of gas pipeline under the condition of train operation are studied, and the influence of turning car on the vibration response characteristics of gas pipeline is analyzed. The results show that the vibration of gas pipeline increases with the increase of operating speed. When the operating speed is 200 km/h, the maximum vibration acceleration of gas pipeline is 1.17 脳 10 ~ (- 3) m ~ (- 2) 路h ~ (- 1). If there is a vehicle under the pipeline, the vibration influence range of the gas pipeline will be significantly increased, the acceleration amplitude displacement and acceleration amplitude increase by 84% and 76%, respectively, and the maximum displacement 2.2 脳 10-Sm, maximum vibration acceleration is 0.0021 m / s 2.3. Through analogical analysis, a train vibration intensity table is established. According to the prediction and calculation results, it is concluded that the train operation in this project will not have a vibration effect on the underpass gas pipeline, which can ensure the normal operation of the pipeline.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU996.7;U211.3

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