成灌快铁桥梁区段环境振动特性研究

发布时间：2019-03-24 21:16

【摘要】：高速铁路运营带来的环境影响主要包括振动污染、噪声污染和电磁辐射。其中振动污染已被认定为七大环境公害之一,成为人们的关注重点。城际铁路的修建是为满足区域内城市间的高密度人群的流动,其线路走向不可避免的需要穿过人群密集处,因而其带来的环境振动污染更值得关注。本文在深入学习国内外铁路交通系统环境振动研究资料的基础上,对成灌快铁桥梁区段地面环境振动进行现场实测,探究成灌快铁桥梁区段的环境振动特性。对成灌快铁位于平康村的桥梁区段A测点(K31+795)进行地面环境振动实测,分析其振动衰减规律,并拟合衰减公式。再对平康村桥梁区段B测点(K31+745)和路桥过渡段C测点(K31+700)进行对比测试,分析不同线路形式对地面环境振动的影响。通过本文的研究得出以下结论：1.当线路形式、地质条件、车辆条件等因素相同时,列车行驶速度成为影响环境振动强度的主要因素。列车行驶速度越快,造成的环境振动强度越大,且高频振动成分越多。2.当地面条件不变时,随距线路中心线距离的增加,地面环境振动强度不断衰减。通过Z振级拟合得到成灌快铁桥梁区段环境振动衰减公式,呈指数形式。随距离增加,振动主频范围不断变窄,近场范围以高频为主,但高频衰减快,远场范围低频成分比例增大,以15-30Hz的中低频为主。当地面条件变化时,随着距线路中心线距离的增加,地面环境振动强度出现反弹衰减现象。3.当列车通过桥梁区段和路桥过渡段时,在路桥过渡段形成的地面环境振动强度明显高于桥梁区段,因而认为桥梁形式的应用对于减少铁路系统造成的环境振动更加有利。
[Abstract]:The environmental impact of high-speed railway operation mainly includes vibration pollution, noise pollution and electromagnetic radiation. Vibration pollution has been recognized as one of the seven major environmental hazards, which has become the focus of people's attention. The construction of inter-city railway is to meet the flow of high-density crowd between cities in the region, and its route direction inevitably needs to pass through the crowded area. Therefore, the environmental vibration pollution caused by the inter-city railway is worth paying more attention to. On the basis of studying the research data of environmental vibration of railway transportation system at home and abroad, in this paper, the field measurement of the ground environmental vibration of the bridge section of the irrigated fast railway is carried out, and the environmental vibration characteristics of the section of the bridge of the irrigated fast railway are explored. In this paper, the ground environmental vibration of the bridge section A (K31 795) of the irrigated fast railway in Pingkang Village is measured, and the attenuation law of the vibration is analyzed and the attenuation formula is fitted. Then, the B measurement point (K31 745) of Pingkang village bridge section and the C test point of road bridge transition section (K31 700) are compared and tested, and the influence of different line forms on the ground environmental vibration is analyzed. Through the research in this paper, the following conclusions are drawn: 1. When the lines, geological conditions, vehicle conditions and other factors are the same, the train speed becomes the main factor affecting the environmental vibration intensity. The higher the train speed, the greater the environmental vibration intensity and the more high frequency vibration components. 2. When the ground condition is constant, the vibration intensity of the ground environment decreases with the increase of the distance from the center line of the line. The formula of environmental vibration attenuation is obtained by Z-level fitting, which is in the form of exponential form. With the increase of distance, the main frequency range of vibration becomes narrower, the near-field range is dominated by high frequency, but the high-frequency attenuation is fast, and the proportion of low-frequency components in the far-field range increases, mainly in the medium-low frequency of 15-30Hz. When the ground conditions change, with the increase of distance from the center line of the line, the vibration intensity of the ground environment appears rebound attenuation phenomenon. 3. When the train passes through the bridge section and the road-bridge transition section, the ground environmental vibration intensity formed in the road-bridge transition section is obviously higher than that in the bridge section. Therefore, the application of the bridge form is more favorable for reducing the environmental vibration caused by the railway system.
【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】：U441.3

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