高铁路基在振动荷载下的空间动态响应特性试验研究  

Experimental study on spatial characteristics of dynamic responses of high-speed railway subgrade under vibrational loading

作　　者：吴龙梁 于琦 江辉煌[1,3] 向卫国[1] 高明显[3] 闫晓夏 WU Longliang;YU Qi;JIANG Huihuang;XIANG Weiguo;GAO Mingxian;YAN Xiaoxia(China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Bureau Public Work of Shenzhen Municipality,Shenzhen 518031,China;Shenzhen Research and Design Institute,China Academy of Railway Sciences Corporation Limited,Shenzhen 518054,China)

机构地区：[1]中国铁道科学研究院,北京100081 [2]深圳市建筑工务署,广东深圳518031 [3]中国铁道科学研究院深圳研究设计院,广东深圳518000

出　　处：《铁道科学与工程学报》2020年第4期799-807,共9页Journal of Railway Science and Engineering

基　　金：中国铁路总公司科技研究开发计划重点课题(2016G006-C);深圳市建筑工务署技术研究课题(THZQ-033-2018)。

摘　　要：为从空间的角度探讨振动荷载下路基的动力响应特性,开展基于振动速度和加速度的现场激振响应试验,得到路基内部水平和竖向动力响应分量沿不同方向的衰减规律。研究结果表明:响应加速度和响应速度沿深度方向和水平方向均呈指数衰减,沿深度方向的衰减相比水平方向更为显著,深度方向衰减系数为水平方向衰减系数的2.5~3倍,并且距离激振点越远衰减越缓慢;响应速度和加速度的竖向分量幅值约为水平分量幅值的2倍,水平分量沿水平方向的衰减速度约为竖向分量的1.5~1.9倍,水平分量沿深度方向的衰减速度约为竖向分量的0.9~1.0倍;进行滤波处理后的响应加速度与响应速度的变化规律相近。加速度对外界激励的响应相比速度更为敏感,能够较好反映出衰减规律的细微变化。In order to study the characteristics of dynamic responses of the subgrade under vibrational load,field loading tests were conducted to monitor excitation responses based on vibration velocity and acceleration,and the dynamic response attenuation law of the subgrade along the depth direction and the horizontal direction was obtained.The results show that acceleration and velocity responses are exponentially decayed along the depth direction and horizontal direction,the attenuation along the depth direction is more significant than that along the horizontal direction,and the attenuation coefficient in the depth direction is 2.5~3 times higher than that in the horizontal direction.The further the vibration point is,the slower the attenuation is;the amplitude of the vertical component of the velocity and acceleration responses is about twice of that in the horizontal direction,and the horizontal component of the attenuation velocity along the horizontal direction is about 1.5 to 1.9 times of the vertical component,and the attenuation of the horizontal component of the velocity along the depth direction is about 0.9 to 1.0 times of the vertical component;the acceleration response after filtering is similar to the velocity response.The acceleration response to the external excitation is more sensitive than the velocity,which can better reflect the subtle changes of the attenuation law.

关 键 词：高铁路基 动力响应 加速度 速度 土动力互易性 

分 类 号：TU470[建筑科学—结构工程]