【摘要】 浅埋软岩隧道施工中爆破振动效应显著,易引发围岩失稳及地表沉降,威胁施工安全及周围环境的稳定性。为有效预测和控制爆破振动,以穿越自然保护区的七美碌曲浅埋软岩隧道工程为研究背景,基于大量隧道内部和地表爆破振动监测,对浅埋软岩隧道爆破振动效应进行了研究。结果表明:质点峰值振动速度最大分量与水平比例距离呈指数相关关系,隧道内壁及非空洞区段地表衰减模型拟合优度均高于0.88。采用水平比例距离的预测效果略好于空间比例距离。在相同比例距离下,由于隧道内地震波的绕射、反射等更为复杂,地表的峰值振动速度整体高于隧洞内壁。在距爆源较近范围内,由于空洞效应的存在,空洞区段地表峰值振动速度呈现出较为明显的振速放大现象,整体高于非空洞区段地表。更多还原

【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.更多还原