摘要
为研究宝兰高铁桥路隧过渡段黄土场地振动特性和放大效应,对宝兰高铁通道里程K1491+202段马营隧道、路基和桥梁桥路隧过渡段黄土场地地面进行现场振动测试,通过采用频谱分析和反应谱分析方法研究高铁列车对桥路隧过渡段临近黄土场地地面振动特征、频谱特征和加速度反应谱特征.结果表明:针对桥墩点振源和路基线振源,黄土斜坡场地地面峰值加速度均比平坦黄土场地大;地面振动持续时间与列车荷载呈正相关关系,黄土斜坡场地持时比平坦黄土场地持时更长;运行列车引起的地面振动频率集中在5~50Hz之间,车速对地面水平向振动的频率有一定影响;能量谱峰值与列车运行速度及轮轴载荷均呈正相关性,振源方式对加速度能量谱有重要影响;加速度反应谱表现为单峰型,能量主要集中在中低频范围内,衰减迅速.同时,该研究结果也可为黄土场地效应提供现场实测依据.
This paper carries out the field vibration test of the loess site in bridge,road and tunnel transition section of the Maying tunnel in the K1491+202 section of Baoji-Lanzhou high-speed railway to study its vibration characteristics and amplification effect.In order to study the characteristics of ground vibration,frequency spectrum and acceleration response spectrum around the loess site in bridge,road,tunnel transition section,spectral analysis and response spectrum analysis are adopted.The results show that whether as a point vibration source of bridge piers or as a line vibration source of subgrade,the ground peak acceleration of slope loess site near high-speed rail is bigger than that of flat loess site.There is a positive correlation between the duration of ground vibration and train load,and the duration of slope loess site is longer than that of flat loess site.The frequency of ground vibration caused by train operation is concentrated among 5-50 Hz,and the speed has certain influence on the frequency of ground horizontal vibration.The peak value of energy spectrum is positively correlated with the train speed and wheel axle load,and the vibration source mode has great influence on the acceleration energy spectrum.The acceleration response spectrum shows a single peak,and the energy is mainly concentrated in the middle and low frequency range and decays rapidly.At the same time,the results of the study can also provide reference in field measurement for the loess site effect.
作者
牛富航
严武建
宿文姬
郑海忠
吴志坚
NIU Fuhang;YAN Wujian;SU Wenji;ZHENG Haizhong;WU Zhijian(State Key Laboratory of Permafrost Engineering,Northwest Institute of Eco-Environment and Resources,CAS,Lanzhou 730000,China;Key Laboratory of Loess Earthquake Engineering,CEA9 Lanzhou 730000,China;Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province,Lanzhou 730000,China;College of Civil Engineering and Communications,South China University of Technology,Guangzhou 510006,China;College of Transportation Science and Engineering,Nanjing Tech University,Nanjing 211800,China)
出处
《北京交通大学学报》
CAS
CSCD
北大核心
2019年第3期89-97,共9页
JOURNAL OF BEIJING JIAOTONG UNIVERSITY
基金
中国地震局地震预测研究所基本科研业务费(2014IESLZ01)
国家自然科学基金(51678545
41472297)
国家重点研发计划(2017YFC1500906)~~
关键词
宝兰高铁
振动测试
黄土场地
频谱
加速度反应谱
Baoji-Lanzhou high-speed railway
vibration test
loess site
spectrum
acceleration response spectrum
