Xu Rui, Zhang Jichun, Wu Bian, Zhang Feng-Liang
Tianjin Municipal Engineering Design & Research Institute, Tianjin 300392, China.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China.
Sensors (Basel). 2023 Sep 1;23(17):7589. doi: 10.3390/s23177589.
With the rapid development of underground space utilization, the excavation of new tunnels with ultra-shallow under crossing buildings using the drilling and blasting method is gradually increasing. The blasting vibration will undoubtedly affect the surrounding buildings. Reducing the impact of blasting vibration on ground buildings has become an important technical challenge faced by tunnel blasting technicians. The inlet end of the Xi'an-Chengdu High-Speed Railway Xiannvyan Tunnel passes below a village through an ultra-shallow buried section; as a result, blasting vibration control is a major concern. A design scheme for a 0.6 m footage in tunnel was proposed and verified through field tests. A 0.8 m footage scheme and 1.8 m footage millisecond interference vibration reduction scheme were proposed, respectively. Based on the HHT analysis, by comparing the surface vibration velocities and instantaneous energy obtained from the millisecond delay detonation of cutting holes and the detonation of different charging schemes, we found that the free surface, mass of single dynamite charges, and tunnel burial depth had significant influences on the surface vibration.
随着地下空间利用的快速发展，采用钻爆法在超浅埋下穿建筑物的情况下开挖新隧道的情况日益增多。爆破振动无疑会对周边建筑物产生影响。降低爆破振动对地面建筑物的影响已成为隧道爆破技术人员面临的一项重要技术挑战。西成高铁仙女岩隧道进口端通过超浅埋地段从一个村庄下方穿过；因此，爆破振动控制是一个主要关注点。提出了一种隧道进尺0.6m的设计方案，并通过现场试验进行了验证。分别提出了进尺0.8m方案和进尺1.8m的毫秒干扰减振方案。基于希尔伯特-黄变换（HHT）分析，通过比较掏槽孔毫秒延时起爆和不同装药方案起爆所获得的地表振动速度和瞬时能量，发现自由面、单响药量和隧道埋深对地表振动有显著影响。
