【摘要】 通过大庆季节冻土场地冬季现场实测试验,实测枕木-路基在列车高速行驶振动荷载作用下振动加速度反应,研究了季节冻土区铁路冬季列车行驶振动加速度反应的变化规律。主要获得了如下结论:(1)列车通过时,枕木主要以竖向振动和横向振动为主;路基近线路中心线处以竖向振动为主,稍远处以纵向振动为主,达到一定距离时主要以横向振动和竖向振动为主;(2)枕木—路基的振动反应与列车类型、行驶速度等因素有关;(3)列车荷载引起的路基振动加速度值随与线路中心线距离的增加而减小。上述研究对真实了解季节冻土场地的枕木-路基体系的动力性能、冻土层对路基振动反应的影响等具有重要的意义,为季节冻土区轨道路基的设计、施工、养护提供依据,给理论研究提供必要的实际依据。更多还原

【Abstract】 Through the field monitoring experiment of Daqing seasonal frozen region in winter,the vibration accelerations of the sleeper and the subgrade induced by train-steering with high speed were measured and the variation laws of vibration acceleration induced by train-steering in the seasonal frozen region in winter were investigated. The main conclusions are as follows:(1) the main vibrations of the sleeper and the subgrade near the center line of the railway are vertical when the train is passing by,the subgrade a little far away from the center line mainly takes on the longitudinal and vertical vibration,and when the distance from the center line to the measured point on the subgrade attains to a certain value,the vibration of the subgrade is lateral and vertical; (2) the vibration responses of the sleepers and the subgrade depend on such influential factors as train type,the velocity etc; (3) the accelerations of the sleepers and the subgrade induced by the train moving load decrease with the increase of the distance from the measured point to the center line of the railway. The above research is very useful for understanding the dynamic performance of the sleeper-subgrade system in the seasonal frozen region,and provides the reference for the design,construction of the railway subgrade in the seasonal frozen region and for the theoretical study.更多还原