【摘要】 为了研究季节冻土区行驶列车引起的含冻土层铁路路基的振动反应特性,在大庆地区季节冻土场地进行了冬季现场试验。试验结果表明:列车行驶产生的路基振动加速度在近轨处具有周期性变化的特征,随着监测点距轨道距离的增大,其周期特性逐渐减弱并消失;季节冻土层的存在对路基竖向振动具有放大作用;列车行驶引起的路基振动加速度随与铁轨距离的增加而减小,并以竖向振动衰减最快;列车行驶过程中会引起环境振动问题,随着距铁轨距离的增大,垂向加速度振级呈递减趋势,时速越小则降幅越大,货车由于轴重大,衰减幅度低于普通客车。更多还原

【Abstract】 In order to study the characters of subgrade vibration with frozen layer induced by the rail transit in the seasonally frozen region,the field monitoring experiment was carried on the seasonal frozen soil area in Daging. The result shows that the vibration acceleration of the subgrade induced by the train has the characteristics of periodic changes,and the characteristics of decrease and gradually become lost in cyclicity with the increase of distance monitoring stations to the center line of the railway are vertical; The existence of seasonally frozen layer have amplification effect to the subgrade vertical vibration; The accelerations of the subgrade induced by the train load decrease with the increase of the distance from the measured point to the railway,and the reduction is the factest of the vertical attenuation; The vertical vibration acceleration level shows a trend of decline with the increase of distance from the center line of the orbit and the speed is smaller,the greater the decline. Because of heavy axle load,the amplitude of attenuation of the truck is lower than ordinary passenger trains.更多还原