重载列车通过高架桥诱发地面振动传播与衰减规律的现场测试研究

Field monitoring of vibration response and attenuation induced by heavy freight trains on viaduct

考虑到以往对重载列车运行诱发铁路高架桥周边地面振动的传播规律及对附近民房的影响研究较少,基于朔—黄重载铁路神山高架周边地面与建筑物的振动速度和加速度的现场实测与分析,借鉴萨道夫斯基公式,研究桥墩周边地面测点的振动速度幅值的传播与衰减规律,以及受轴重和车速的影响,地面和建筑物振动响应的振动规律。结果表明,梁端测线上各测点振动速度随距离衰减更快,且明显呈非线性,随列车速度变化也更为显著;基于对实测数据的分析,得到质点峰值振动速度与距激励源距离、列车速度、轴重之间的关系式;相同型号的空载车与满载车引起的振动速度幅值相差较大,而不同型号的空车之间振动差则较小;对屋顶、室内、基础测点的峰值振动速度及加速度级的分析表明,在10~20 Hz范围,屋顶竖向振动大于横向,且一些频段振级超过规范限值,对附近民房内人体舒适性有一定影响。

Few researches were conducted on the law of the ground vibration induced by heavy haul trains and the influence on the houses nearby,based on field test of vibration velocity and acceleration around Shuo-Huang railway bridge above Shenshan Village,the propagation and attenuation law of the amplitude of vibration velocity is analyzed,a regression analysis method for vibration propagation attenuation of railway viaduct is proposed,it is found that the attenuation of each measuring point on the beam-end line is faster than that of the middle line of bridge,and the attenuation law is nonlinear. Based on the analysis of the measured data, the relationship between the peak vibration velocity of the particle and the distance from the excitation source,the train speed and the axle load is obtained. There is a big difference between the same type of empty and full load trains,but there is little difference between the different models. Based on the analysis of the peak vibration velocity and acceleration level of the roof,indoor and basic measurement points,the comfort effects of the nearby houses and indoor people are studied. It is found that the vertical vibration of the roof is larger than that of the transverse direction between 10 and 20 Hz,and the vibration level of some bands have exceeded the standard.