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Studies on vibration generation and transmission in tack and ground from high-speed trains

高速列车粘地和地面振动产生与传播研究

基本信息

批准号：
13650522
负责人：
TAKEMIYA Hirokazu
金额：
$ 2.5万
依托单位：
OKAYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

The present investigation focused first on the dynamic behavior of the track and the wave motions in the nearby ground where the train speed approaches the wave velocity in the underlying ground. Then, the vibration mitigation is considered by a rationally designed countermeasure of limestone columns beneath the track in view of the wave motions at site. For illustrative example, the case of X-2000 high-speed train at the West Coast in Sweden is demonstrated with some comparison with the field measurement.The present modeling of the track-ground system lead an excellent response prediction in comparison with the field measurements. The sleepers' effect on vibration is clarified in the frequency domain : namely, at the low train-speed of 70 km/h they generated the frequencies that are determined by the integer multiplied quotient of train speed against sleepers spacing, however, for 200 km/h the dynamic wave generation more dominates the response so that the sleepers' effect appears almost negligibly small. The velocity component, on the other hand, is greatly affected by the presence of sleepers for the train speed of 70 km/h but not for the 200 km/h. There are different situations we concern for response levels either by displacement, velocity or acceleration. The appropriate engineering judgment should be made on the basis of most involved physical quantities.For controlling of the track vibration the installment of lime-cement columns were made beneath it This worked as the wave impeding barrier and proved to be very effective to reduce the large response displacements for 200 km/h to the very small level for 70 km/h. The visual presentation is demonstrated for easy understanding of the behavior of track and the soil beneath it.

目前的研究首先集中在轨道的动力行为和附近地面上的波运动，当火车的速度接近在下面的地面上的波速。然后，根据现场的波动情况，合理设计轨道下灰岩柱的减振对策。以瑞典西海岸的X-2000高速列车为例，并与现场测量结果进行了比较。与现场实测结果相比，本文所建立的轨道-地面系统模型具有较好的响应预测效果。在频域上阐明了枕木对振动的影响，即在70 km/h的低列车速度下，枕木产生的频率由列车速度与枕木间距的整数乘商决定，而在200 km/h时，动力波的产生更主导响应，因此枕木的影响几乎可以忽略不计。另一方面，在列车速度为70 km/h时，轨枕的存在对速度分量的影响很大，而在200 km/h时，轨枕的存在对速度分量的影响不大。我们通过位移、速度或加速度来关注不同情况下的响应水平。应根据大多数涉及的物理量作出适当的工程判断。为控制轨道振动，在轨道下方设置石灰-水泥柱，起到阻波屏障的作用，将200 km/h时的大响应位移减小到70 km/h时的小响应位移，效果显著。为了便于理解轨道及其下面的土壤的行为，演示了可视化表示。