摘要
对上海磁悬浮列车引起的场地环境微振动进行了现场实测,分析研究了磁悬浮列车运行引起的振动随距离和深度变化的规律。研究结果表明:实测磁悬浮列车引起的环境振动随距离的增加而减小,其远场土层优势频率为3~6Hz。Bornitz的理论预测公式可较为准确的预测磁悬浮列车振动随距离的变化,但在近场区域会有2~8 mm/s^(2)的高估,土体材料阻尼在环境振动衰减中会发挥一定的作用;磁悬浮列车引起的远场振动在地下5m处存在放大区,而对于位移振幅随深度的变化,弹性半空间解析解会低估其振动量级。
Through the in-situ measurement of the environmental vibration caused by the maglev train in Shanghai,the decay of the vibration with distance and depth is analyzed.The results show that the vibration caused by maglev train decreases with distance,and the dominant frequency of far-field vibration is 3~6 Hz.The material damping of soil plays a certain role in the vibration decay and it cannot be ignored,especially in the far field.The Bornitz’s theoretical prediction formula can accurately predict the vibration with distance in general,although there is an overestimation of 2~8 mm/s^(2) in the near-field region.The vibration in far-field at the depth of 5 m is amplified compared to that of the ground.Regarding the vibration amplitude along the depth,the elastic analytical solution may underestimate the actual vibration.
作者
余宽原
顾晓强
黄茂松
马险峰
李宁
YU Kuan-yuan;GU Xiao-qiang;HUANG Mao-song;MA Xian-feng;LI Ning(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China;SGIDI Engineering Consulting(Group)Co.,Ltd.,Shanghai 200093,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2020年第S01期146-150,共5页
Chinese Journal of Geotechnical Engineering
基金
上海市市级重大科技专项项目(2017SHSZZX02)
国家自然科学基金项目(51822809)
关键词
环境振动
磁悬浮
振动衰减
瑞利波
材料阻尼
environmental vibration
maglev train
vibration decay
Rayleigh wave
material damping
