高速铁路路桥过渡段路基动响应特性研究

STUDY ON THE DYNAMIC RESPONSE OF HIGH SPEED RAILWAY BRIDGE-SUBGRADE TRANSITION SECTION

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规律进行了研究。分析了沿路桥过渡段线路纵向的动应力分布规律、列车速度和动应力的关系,以及动应力沿路基深度方向的变化规律等。分析表明:沿铁路线纵向随车速的增大,动应力有不同程度的增加;动应力随路基深度的增加衰减很快,并且随着深度的增加,动应力值和静态应力值越来越接近;过渡段路基速度动力系数小于0.3,用速度动力系数能够直观地表示速度对路基的动力作用。

Based on the field test,the dynamic response of a roadbed-bridge transition section on which a disperse impetus locomotive with high speed is running are studied in this paper.The longitudinal distributive regularities of the dynamic stress of the roadbed-bridge transition section,relationships between the speed of the train and the dynamic stress,and changes the dynamic stress with the depth of the subgrade are analyzed.The analysis indicates that the longitudingal dynamic stress grows in varying degrees with the train speed increased;The dynamic stress affenuates fast with increasing the depth of the subgrade;with increase in the depth,the dynamic stress is closer to the static stress.The dynamic coefficient of the train speed for the bridge-subgrade transition section is smaller than 0.3,the dynamic coefficient of the train speed can be used to indicate intuitively the dynamic action of the train speed on the roadbed.