运营前后高速铁路短间距路涵过渡段振动特性测试研究  

Study on Vibration Characteristics of Closely Spaced Subgrade-culvert Transition Sections of High-speed Railway before and after Commercial Operation

作　　者：屈畅姿[1,2] 魏丽敏[3] 王永和[3] 何群[3] 

机构地区：[1]湘潭大学土木工程与力学学院,湖南湘潭411105 [2]湘潭大学岩土力学与工程安全湖南省重点实验室,湖南湘潭411105 [3]中南大学土木工程学院,湖南长沙410075

出　　处：《铁道学报》2017年第10期118-125,共8页Journal of the China Railway Society

基　　金：国家自然科学基金(51508489);湖南省教育厅高校科研专项经费(13C934)

摘　　要：针对高速列车反复运行对短间距路涵过渡段的影响,采用动力测试系统测试联调联试期及正式运营期过渡段的动响应。对比分析正式运营前后动响应幅值沿线路纵向的分布规律和沿路基深度的衰减规律,分析振动的峰值频率、振动能量的频带分布及沿深度衰减规律,得到路基综合刚度对过渡段振动特性的影响规律。结果表明:振动峰值频率不随深度变化,中频振动能量对基床表层以下路基存在影响;正式运营2年后,动响应沿线路纵向的分布曲线变平缓,过渡段纵向整体平顺性有所提高,列车动载长期反复作用增加了路基综合刚度,主要表现为基床表层刚度的增加。To investigate the effect of repeated train load on closely spaced subgrade-culvert transition sections of high-speed railway, the dynamic test system was used to test the dynamic response of the transition section during the debugging and commissioning as well as commercial operation. The longitudinal distribution law of dynamic response amplitude along line and the attenuation law of the dynamic response amplitude along the subgrade depth before and after commercial operation were compared and analyzed. The peak frequency of vi-bration, the distribution law of vibration energy in different frequency bands and the attenuation law along the depth of vibration energy were also analyzed. The influence of the comprehensive stiffness of the subgrade on the vibration characteristics of the transition section was obtained. The results show that the peak frequency of vibration does not change with the depth, and the vibration energy in intermediate frequency has an impact on the subgrade below the surface layer. The longitudinal distribution curves of dynamic response along the line became smoother after two years operation. The longitudinal overall regularity of the transition section was improved. The repeated train load during operation increases the comprehensive stiffness of the subgrade as is mainly reflected in the increase of the surface stiffness of the subgrade.

关 键 词：路涵过渡段 运营期 高速铁路 振动特性 

分 类 号：U213.1[交通运输工程—道路与铁道工程]