移动荷载下轨道-隧道-地基振动响应分析  

Dynamic Responses of Track-Tunnel-Ground Model Induced by Moving Load

作　　者：黄强 刘干斌[1] 冯青松 黄宏伟[3] 洪方岳[4] HUANG Qiang;LIU Ganbin;FENG Qingsong;HUANG Hongwei;HONG Fangyue(Institute of Geotechnical Engineering,Ningbo UniversityNingbo,315211,China;School of Civil Engineering and Architecture,East China Jiaotong University Nanchang,330013,China;Department of Geotechnical Engineering,Tongji University Shanghai,200092,China;Ningbo Rail Transit Group Co.,Ltd.Ningbo,315101,China)

机构地区：[1]宁波大学岩土工程研究所,宁波315211 [2]华东交通大学土木建筑学院,南昌330013 [3]同济大学地下建筑与工程系,上海200092 [4]宁波市轨道交通集团有限公司,宁波315101

出　　处：《振动．测试与诊断》2020年第6期1191-1197,1237,共8页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(52008214,51538009);宁波市自然科学基金资助项目(2019A610399);同济大学岩土及地下工程教育部重点实验室开放基金资助项目(KLE-TJGE-B1904)。

摘　　要：地铁列车运行引起的环境振动日益引起人们的关注。通过引入位移势函数和傅里叶变换,推导了移动荷载作用下轨道-隧道-地基纵向二维耦合模型的振动响应解答,并与一维地基梁模型的响应结果进行比较。研究表明,将隧道考虑为Timoshenko梁时得到的隧道挠度及地层位移要比Euler梁时的大,但系统的临界速度会有所降低。隧道埋深越大,隧道和地基变形越小;反之,下卧地层越厚,隧道和地基的振动位移越大。浮置板轨道可以有效减少传递至隧道上的振动荷载幅值,但对隧道和地层位移的影响不大。一维轨道-隧道-地基模型可以用来确定隧道内的振动荷载,但是两者的挠度计算结果只在列车速度及地基厚度不大时较为接近,否则差异较大。研究对于地铁振动响应的理论分析具有一定的参考价值。The metro train induced environmental vibration increasingly attracts people′s attention.By introducing displacement potential functions and Fourier transformation,theoretical solution for the two-dimensional longitudinal track-tunnel-ground model is derived,and compared with the one-dimensional foundation beam model.It indicates that tunnel deflection and ground displacement becomes greater when the tunnel is modelled by Timoshenko beam rather than Euler beam,however,the critical velocity of the 2D coupled model decreases.Larger tunnel buried depth reduces the dynamic displacement of tunnel and ground.In contrast,a larger thickness of the underlying ground produces greater displacement.The floating slab track can significantly reduce the vibration load transmitted to the tunnel but has little effect on the tunnel deflection and ground displacement.1D track-tunnel-ground model is feasible to determine the vibration load on the tunnel,however,the track and tunnel deflections from these two analytical models are approximate only when the train speed and soil thickness are not large.Otherwise,the deflection discrepancy would be great.The present study has some reference value for the theoretical analysis on the train-induced vibration.

关 键 词：轨道-隧道-地基模型 铁木辛柯梁 浮置板轨道 隧道挠度 移动荷载 

分 类 号：U25[交通运输工程—道路与铁道工程]