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于轨道的动态行为和附近地面的波浪运动，其中火车速度接近底层地面的波浪速度。然后，针对现场波浪运动，合理设计轨道下方石灰石柱的减振对策。举例来说，瑞典西海岸的 X-2000 高速列车案例通过与现场测量的一些比较进行了演示。与现场测量相比，轨道-地面系统的当前建模具有出色的响应预测。枕木对振动的影响在频域中得到了阐明：即，在 70 公里/小时的低火车速度下，它们产生的频率由火车速度与枕木间距的整数乘商确定，但对于 200 公里/h 动态波的产生更多地主导响应，因此枕木的影响几乎可以忽略不计。另一方面，对于 70 公里/小时的列车速度，速度分量受轨枕存在的影响很大，但对于 200 公里/小时的列车速度则不然。我们在不同的情况下关注位移、速度或加速度的响应水平。应根据最涉及的物理量做出适当的工程判断。为了控制轨道振动，在其下方安装了石灰水泥柱，作为波浪阻挡屏障，事实证明对于减少大的振动非常有效。 200公里/小时的响应位移降至70公里/小时的非常小的水平。演示视觉演示是为了轻松理解轨道及其下方土壤的行为。