成渝客运专线桥梁段环境振动衰减特性分析

发布时间：2018-02-08 14:26

本文关键词： 高速铁路桥梁成渝客运专线环境振动衰减特性　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：近年来,各个国家积极发展与完善高速铁路,与此同时,高速铁路运营诱发的环境振动的问题也愈发突出,目前国内外虽然开展了很多相关的科研工作,但是还需要更全面更深入的研究。在这个背景下,本论文在查阅大量国内外关于高速铁路环境振动的文献,对高速铁路的环境振动开展理论分析的基础上,根据成渝客运专线桥梁段列车高速运行时诱发的地面环境振动的实测数据结果,分析探讨高速铁路桥梁段列车通行时诱发的环境振动的衰减特性和规律,并采用统计学的回归分析方法得出成渝客运专线桥梁段的环境振动随距离衰减的经验公式。最后,使用已有的预测模型,得出环境振动强度随距离的衰减趋势,并对预测数据的衰减曲线与实测数据的衰减曲线进行对比分析,验证预测公式的适用性,讨论得出最适合成渝客运专线桥梁段环境振动的预测公式。本文的主要研究结论如下:(1)成渝客运专线桥梁段列车以300 km/h左右的行驶速度高速通过时,随着到振源距离的加大,最大Z振级VLZmax表现出波动性衰减的趋势,且最大Z振级VLZmax在到振源距离为32.5 m的范围内衰减的幅度比较大,整体衰减了 15.6 dB,32.5m后衰减速度减慢。(2)根据拟合曲线可以得知成渝客运专线高速列车通过桥梁区段时,地面环境振动的强度随到振源的距离的增加而慢慢衰减,且各测试点环境振动最大Z振级VLZmax与到振源的对数距离基本上呈线性关系。(3)运用"铁计[2010]44号文"中所给出的模式预测法和日本的京都公害研究所针对高架结构的环境振动预测的经验公式,分别预测成渝客运专线桥梁段的环境振动的衰减情况,得出的预测数据与实测数据存在一定的差异。与其他两个公式相比,本论文拟合出的衰减公式得出的预测数据与实测数据最接近,而且预测数据曲线与实测数据曲线的衰减趋势基本一致,因此最适合成渝客运专线同等条件下桥梁段的环境振动预测。
[Abstract]:In recent years, various countries have actively developed and improved high-speed railways. At the same time, the problems of environmental vibration induced by high-speed railway operation have become increasingly prominent. At present, although a lot of related scientific research work has been carried out at home and abroad, But there is still a need for more comprehensive and in-depth research. Under this background, this paper is based on the theoretical analysis of the environmental vibration of high-speed railway by consulting a large number of literature on environmental vibration of high-speed railway at home and abroad. Based on the measured data of ground environmental vibration induced by high speed train running in bridge section of Chengdu-Chongqing passenger dedicated line, the attenuation characteristics and law of environmental vibration induced by train in bridge section of high-speed railway are analyzed and discussed. The empirical formula of environmental vibration attenuation with distance of Chengdu-Chongqing passenger dedicated Line is obtained by using statistical regression analysis method. Finally, using the existing prediction model, the attenuation trend of environmental vibration intensity with distance is obtained. The attenuation curve of the predicted data is compared with the attenuation curve of the measured data, and the applicability of the prediction formula is verified. The prediction formula for the environmental vibration of the bridge section of Chengdu-Chongqing passenger dedicated line is discussed. The main conclusions of this paper are as follows: 1) when the train of the bridge section of Chengdu-Chongqing passenger dedicated line passes at a high speed of about 300 km/h, with the increase of the distance to the vibration source, The maximum Z-level VLZmax shows the trend of fluctuation attenuation, and the maximum Z-level VLZmax has a large attenuation amplitude in the range of 32.5 m from the source to the vibration source. When the high-speed train of Chengdu-Chongqing passenger dedicated line passes through the bridge section, the intensity of ground environment vibration slowly decreases with the increase of the distance to the vibration source, according to the fitting curve, when the high-speed train passes through the bridge section, the intensity of the ground environment vibration decreases slowly with the increase of the distance to the vibration source. Moreover, the logarithmic distance between the maximum Z vibration level VLZmax and the vibration source of each test point is basically linear.) the model prediction method given in "Iron Meter [2010] 44" and the Kyoto Institute of Environmental hazards in Japan are used to solve the problem of elevated structure. Empirical formula for environmental vibration prediction, The attenuation of the environmental vibration of the bridge section of Chengdu-Chongqing passenger dedicated line is predicted respectively, and the predicted data are different from the measured data, and compared with the other two formulas, The predicted data obtained from the attenuation formula fitted in this paper are the closest to the measured data, and the attenuation trend of the predicted data curve is basically consistent with that of the measured data curve. Therefore, it is most suitable for the environmental vibration prediction of the bridge section under the same conditions of Chengdu-Chongqing passenger dedicated line.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441.3;U211.3

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