季节性冻土区扩能改造铁路路堤动力性能测试分析
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摘要
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。
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.
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.
引文
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[3]吴春秋,肖大平.复合地基加固路堤的稳定性分析[J].岩土力学,2007,28(增1):905-908.
[4]张培文,陈祖煜.弹性模量和泊松比对边坡稳定安全系数的影响[J].岩土力学,2006,27(2):299-303.
[5]徐学燕,马元顺,李治国.季节冻土区路堤边坡稳定性影响因素研究[J].低温建筑技术,2010,32(1):86-87.
[6]杨海蓉.多年冻土地区防治路基融化了沉及提高其稳定性的措施[J].冰川冻土,1985,7(1):83-88.
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[8]杨广庆.高速铁路路基设计与施工[M].北京:中国铁道出版社,1999.
[9]乔翔.基于极限平衡法的高边坡稳定性分析及处治措施[J].铁道建筑,2017,57(8):89-93.
[10]郑波,张建明,马小杰,等.青藏铁路冻土路基路堤、路堑过渡带试验研究[J].中国铁道科学,2007,28(4):12-18.
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[12]赵永峰,谢强,王子江,等.川藏铁路季节性冻土区粗颗粒土边坡温度场特征[J].铁道建筑,2017,57(5):95-99.