摘要
高速列车(HST)诱发的振动可能对周边生活、仪器运营甚至建筑安全造成负面影响,已引起学者和政府的关注。在京-沪(北京至上海)高铁段开展大量的路基高架过渡段场地振动现场实测,同时记录列车运行速度在250~350km/h之间的场地垂向、横向和纵向三个方向的振动,分析其在时域、频域及振幅在不同距离和车速下的特性,基于加速度级评价过渡段高铁引起场地振动的水平。分析结果表明,垂向振动通常在近场范围内占主导,在中远场和水平向振动相当;距离轨道20m左右范围存在振动区;地面的主要振动频率通常是与列车的几何尺寸和轨道的不均匀性相关的特征频率的n倍。测试结果对于研究高铁环境振动及数值的验证具有重要意义。
The vibrations induced by high speed train(HST)may cause negative impacts on the surrounding environment,instrument operation,and even the safety of buildings,thus it should be paid more attention by the researchers and governments.In-situ measurements at the transition section to measure the ground vibrations caused by the operation of HST were conducted on the Beijing-Shanghai high-speed railway in China.The ground vibration accelerations were recorded during the tests in three directions(i.e.,vertical,horizontal and longitudinal directions)when train speeds are between 250 and 350 km/h.The characteristics of vibrations in the time domain,the frequency domain and the amplitude under different distance and speeds are analyzed.Furthermore,based on the levels of acceleration,the extents of site vibration caused by the operation of the high-speed rail at the transition section are evaluated.The analysis results show that the vertical vibrations are usually dominated in the near-field region and are comparable in the mid-and far-field and horizontal-direction vibrations.An obvious vibration amplification zone is found in the region within a distance of 20 m to the railway The dominant vibration frequencies of the ground are typically n times than the characteristic frequencies related to the train’s geometry dimension and unevenness of the railway.The test results are of great significance for the verification of numerical values about the vibration in high-speed railway environment.
作者
张晓磊
冯世进
李义成
王雷
ZHANG Xiao-lei;FENG Shi-jin;LI Yi-cheng;WANG Lei(Department of Geotechnical Engineering of Civil Enginnring,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2020年第S01期187-194,共8页
Rock and Soil Mechanics
基金
国家重点基础研究发展计划(973计划)青年科学家项目(No.2014CB049101)
上海市工程结构安全重点实验室开放课题(No.2017-KF02)
关键词
高速铁路
环境振动
现场试验
过渡段
振动评价
high speed railway
environmental vibrations
field test
transition section
vibration evaluation
