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中文摘要：
对某隧道区间段和附近地表的振动进行实测，采集不同工况的顺车行水平方向、横车行水平方向和垂直地面方向的加速度时程，并转化为傅里叶幅值谱进行衰减规律的频谱分析，对其加速度三分量的1／3倍频程振级、总振级、加速度峰值和均方根值衰减规律进行分析，然后用线性最小二乘法拟合得出振动的衰减公式，对比交通荷载引起的振动在地下和地面传播时的衰减规律．实测结果表明：地面交通振动中垂向的加速度峰值最大，而隧道交通振动中垂向加速度的峰值最小；隧道交通振动加速度所包含的主要频率成分在20--100Hz之间，地面交通振动加速度所包含的主要频率成分在30～250Hz之间；公路交通引起的振动随着距离振源的增大而逐渐衰减，并且振动在较近的距离内迅速衰减；高频部分在10m左右几乎完全衰减，而低频部分的振动随着距离的增大衰减较缓，甚至在100m处仍有残余振动．
英文摘要：
In situ experiment of environmental vibration caused by a tunnel and the road nearby was carried out. Acceleration time history data under different testing situations was collected with three directions （including horizontal along the driveway, horizontal and perpendicular to the driveway, and vertical）. Through frequency spectrum analysis of attenuation of Fourier amplitude, three acceleration components attenuation analysis （including vibration level of 1/3 octave band, total vibration level, peak acceleration value and rms value）, and linear least squares fit, a vibration attenuation formula is conducted and then used to compare different attenuation pattern of underground and on ground surface. The analysis shows the following conclusions： The vertical acceleration peak value on ground surface is the highest among the three directions while it is the lowest in the underground situation. Acceleration frequency component of vibration is mainly between 20-100 Hz in the tunnel while is mainly between 30~250 Hz on the road. The vibration decays mostly near the source and attenuates with distance. High frequency component is almost completely attenuated within 10 m distance while low frequency component attenuates slower with distance, which still exists at a 100 m distance.
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