成灌快速铁路桥梁段环境振动特性研究
发布时间：2019-06-27 20:01
【摘要】：轨道交通引起的环境振动问题越来越突出,已成为七大环境公害之一。国内外学者已在环境振动方面开展了大量的研究,并取得了丰富的研究成果,但这些研究成果还不能完全解决实际工程中的振动问题。本文在研究环境振动理论的基础上结合现场实测的方法对成灌快速铁路桥梁段引起的环境振动进行研究,以进一步了解其环境振动特性。 首先对正线桥梁段三处测点地面的环境振动进行实测,分析各测点的振动变化规律并归纳出振动衰减公式,初步揭示成灌快速铁路桥梁段的环境振动特性。其次,运用本文归纳的衰减公式、铁计[2010]44号文中推荐的模式法预测公式、日本京都公害研究所提出的预测公式对成灌快速铁路桥梁段的环境振动进行预测,比较各预测公式计算出的预测值与实测值的相符度,依据符合度选出较适合成灌快速铁路桥梁段的环境振动预测公式。本文的主要研究结论如下： 1.从各振动测试指标的变化趋势可知：随着距线路中心距离的增加,振级、振动加速度均在迅速减小,且在衰减过程中,近振源处的衰减速度大于远振源处的衰减速度。 2.从1/3倍频程曲线、频谱曲线的变化趋势可知：近振源处高频占主导作用,远振源处低频占主导作用,高频部分的衰减速度大于低频部分的衰减速度；振动主频范围、最优频率、振动幅值均随距离的增加而逐渐减小。成灌快速铁路桥梁段环境振动的主要能量集中在10-63Hz之间。 3.对比全福村Y型墩测点内外线的时程曲线和频谱曲线可知：列车速度的增加会引起环境振动的增加。 4.环境振动衰减趋势分析结果表明,各测点环境振动基本以指数规律衰减。预测结果表明,本文衰减公式的符合度较好,铁计[2010]44号文中的模式预测公式符合度次之,日本京都公害研究所的符合度最低。因此,相比其他两种预测方法,本文归纳出的衰减公式最适合成灌快速铁路桥梁段的环境振动预测。
[Abstract]:The problem of environmental vibration caused by rail transit is becoming more and more prominent, which has become one of the seven environmental hazards. Scholars at home and abroad have carried out a lot of research on environmental vibration, and have made a wealth of research results, but these research results can not completely solve the vibration problem in practical engineering. In this paper, on the basis of studying the theory of environmental vibration and the method of field measurement, the environmental vibration caused by the bridge section of high speed railway is studied in order to further understand the characteristics of environmental vibration. Firstly, the environmental vibration of the ground at three measuring points in the main line bridge section is measured, the vibration variation law of each measuring point is analyzed, and the vibration attenuation formula is summarized, and the environmental vibration characteristics of the bridge section of the high speed railway are preliminarily revealed. Secondly, the attenuation formula summarized in this paper, the model method prediction formula recommended in iron meter [2010] 44, and the prediction formula proposed by Kyoto pollution Research Institute of Japan are used to predict the environmental vibration of the bridge section of Chengdu-irrigation fast railway. The predicted values calculated by each prediction formula are compared with the measured values, and the environmental vibration prediction formula suitable for the bridge section of Chengdu-irrigation fast railway is selected according to the coincidence degree. The main conclusions of this paper are as follows: 1. From the changing trend of each vibration test index, it can be seen that with the increase of the distance from the center of the line, the vibration level and vibration acceleration decrease rapidly, and in the process of attenuation, the attenuation speed near the vibration source is greater than that at the far vibration source. two銆，
本文编号：2507106
[Abstract]:The problem of environmental vibration caused by rail transit is becoming more and more prominent, which has become one of the seven environmental hazards. Scholars at home and abroad have carried out a lot of research on environmental vibration, and have made a wealth of research results, but these research results can not completely solve the vibration problem in practical engineering. In this paper, on the basis of studying the theory of environmental vibration and the method of field measurement, the environmental vibration caused by the bridge section of high speed railway is studied in order to further understand the characteristics of environmental vibration. Firstly, the environmental vibration of the ground at three measuring points in the main line bridge section is measured, the vibration variation law of each measuring point is analyzed, and the vibration attenuation formula is summarized, and the environmental vibration characteristics of the bridge section of the high speed railway are preliminarily revealed. Secondly, the attenuation formula summarized in this paper, the model method prediction formula recommended in iron meter [2010] 44, and the prediction formula proposed by Kyoto pollution Research Institute of Japan are used to predict the environmental vibration of the bridge section of Chengdu-irrigation fast railway. The predicted values calculated by each prediction formula are compared with the measured values, and the environmental vibration prediction formula suitable for the bridge section of Chengdu-irrigation fast railway is selected according to the coincidence degree. The main conclusions of this paper are as follows: 1. From the changing trend of each vibration test index, it can be seen that with the increase of the distance from the center of the line, the vibration level and vibration acceleration decrease rapidly, and in the process of attenuation, the attenuation speed near the vibration source is greater than that at the far vibration source. two銆，
本文编号：2507106
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