高速下过渡段路基动响应特性研究  

Study on the dynamic response of transition section roadbed subject to high speed

作　　者：李献民[1] 王永和[1] 杨果林[1] 肖宏彬[1] 范臻辉[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《岩土工程学报》2004年第1期100-104,共5页Chinese Journal of Geotechnical Engineering

基　　金：铁道部科技专项基金资助项目(99G14)

摘　　要：通过现场实测,对秦沈客运专线动力分散型机车在某路桥过渡段高速行车条件下的动响应(动应力、动应变)规律进行了研究。研究表明:路基最大动响应曲线与平均动响应曲线变化趋势相同;对于相同行车速度,纵向(沿线路基床水平方向上)动响应曲线呈"V"形变化、动响应增量曲线呈不规则"N"形变化,而垂向(与地面铅垂方向上)则是随深度的增加动响应呈衰减趋势,并且在基床面浅处(0.6m左右)衰减幅度较大;纵向、垂向上的动响应都有随车速提高而减小的趋势,并且其减小幅度与车速高低紧密相关。同时,提出了预测过渡段路基动响应变化趋势的列车轴重变化系数计算公式,以及"超高"填筑路基减小过渡段沉降差值和动响应的设计思路,研究结果为高速铁路过渡段的设计与施工提供了重要基础。Based on the field test,the dynamic responses (dynamic stress and strain) of a roadbed-bridge transition section under the disperse impetus locomotive with high speed are studied in this paper.It is shown that the variation of the maximum and average dynamic response curves is same. On the same speed condition, the dynamic response curves and the dynamic response increment curves are in the shape of 'V' and 'N' respectively in the direction of railway line;and in the direction of depth the dynamic response curves decline with the increase of depth and the declining extents are bigger within shallow roadbed (about 0.6 m), with the speed increases the dynamic responses in the direction of railway line and depth decline,and the declining extents are related to the train speed tightly. At one time, the variation coefficient formula of train axes-weight is put forward to forecast general trend of variation of the dynamic responses in the transition section roadbed, and a design idea is advanced that'excess height'of roadbed can reduce the differential settlement and the dynamic response of transition section roadbed. The test study provides an important basis for the design and construction of the transition section roadbed of express railway.

关 键 词：高速铁路 动响应 沉降差 路基 填筑 

分 类 号：U238[交通运输工程—道路与铁道工程]