季节性冻土区扩能改造铁路路堤动力性能测试分析

对长春—白城—乌兰浩特铁路扩能改造工程路堤进行实车运行测试,研究CRH2C-2068综合检测列车在速度等级分别为140,160,170,176 km/h运行条件下季节性冻土区铁路路堤表面动荷载、动变形和振动特性的变化规律,以确定路堤是否满足相应标准要求。测试结果表明:路堤K14+973和路堤K62+119基床表面动荷载最大值分别为32,29 kPa,动变形最大值分别为0. 54,0. 30 mm,振动加速度最大值分别为1. 0,1. 2 m/s^2;路堤动力性能满足动车组以160 km/h及以下速度运行时的相关标准要求。

Dynamic Performance Test and Analysis of Railway Embankment Improvement by Capacity Expansion in Seasonal Frozen Soil Region

Through the real vehicle operation test of the Changchun-Baicheng-U lanhot railway embankment improvement by capacity expansion,the surface dynamic load,deformation and vibration characteristics of railway embankment in seasonal frozen zone are studied when the C RH 2 C-2068 comprehensive inspection train runs with speed of 140,160,170 and 176 km/h,respectively. The objective is to determine w hether the embankment satisf ies the requirements of the corresponding standards.T w o sections of the embankment are tested at K14+973 and K62+119 subgrade bed surface.The measured maximum dynamic load at these tw o sections is 32 and 29 kPa,respectively.The maximum dynamic deformation is 0. 54 and 0. 3 mm,respectively.And the maximum acceleration of vibration is1. 0 and 1. 2 m/s^2,respectively.T hus,the dynamic performance of the embankment satisfies the relevant standards requirements when the EM U running with speed no more than 160 km/h.