关键词: 浅埋隧道　, 自然保护区　, 质点峰值振动速度　, 衰减模型

Abstract: The blasting vibration effect is significant in the construction of shallow soft rock tunnel,which is easy to cause
the instability of surrounding rock and surface subsidence,threatening the construction safety and the stability of the surrounding
environment. In order to effectively predict and control blasting vibration,the blasting vibration effect of shallow buried soft
rock tunnel is studied based on a large number of tunnel internal and surface blasting vibration monitoring,taking Qimeiluqu
shallow buried soft rock tunnel project crossing the nature reserve as the research background. The results show that there is an
exponential correlation between the maximum component of the peak particle vibration velocity and the horizontal proportional
distance,and the goodness of fit of the attenuation model of the inner wall of the tunnel and the surface of the non-cavity section
is higher than 0. 88. The prediction effect of horizontal proportional distance is slightly better than that of spatial proportional
distance. At the same proportional distance,due to the more complex diffraction and reflection of seismic waves in the tunnel,
the peak vibration velocity of the surface is higher than that of the inner wall of the tunnel. In the near range from the explosion
source,due to the existence of the cavity effect,the peak vibration velocity of the surface in the cavity section shows a more obvious
vibration velocity amplification phenomenon,which is higher than that of the surface in the non-cavity section.

Key words: shallow tunnel,nature reserve,peak particle velocity,attenuation model