Controlling Vibration Speed in Tunnel Excavation Using Fine Blasting Method under Complex Environmental Conditions

• Published in: Shock and vibration Vol. 2021; no. 1
• Main Authors: Zhang, Yingcai, Zhang, Jiyun, Wang, Shuren, Chen, Yubo
• Format: Journal Article
• Language: English
• Published: Cairo Hindawi 2021; John Wiley & Sons, Inc; Hindawi Limited
• Subjects: Attenuation; Blasting; Boreholes; China; Construction; Drilling rigs; Efficiency; Energy dissipation; Engineering; Environmental quality; Excavation; Exponential functions; Geology; Linear functions; Methods; Propagation velocity; Segmentation; Shock wave propagation; Shock waves; Superposition (mathematics); Tunnels; Velocity; Vibration analysis; Vibration control; Water supply; Wave propagation; Waveforms; China
• ISSN: 1070-9622; 1875-9203
• DOI: 10.1155/2021/6060485

It is very important to reduce the impact of blasting vibration on the surrounding structures during the tunnel drilling-blasting excavation. Taking the diversion tunnel of the urban water supply project in Zhumadian, Henan Province, China, as an example, the segmentation linear function between the drilling rig and borehole depth was established by fining blasting design. The test of the blasting number and particle vibration velocity was designed. The propagation and attenuation characteristics of blast vibration velocity in the surrounding rocks of the tunnel were analyzed by using theoretical calculation and field monitoring methods. Results show that the fine blasting design can realize the superposition of negative phase of shock waveform to reduce the vibration speed. With the increase of the blasting number, the attenuation of the particle vibration velocity shows a negative exponential function, and the dimensionless vibration velocity loss increases in a power function. The greater the loss, the greater the energy loss during the shock wave propagation process, which is more conducive to ensuring the stability of the protected buildings. The research results can provide the reference for similar engineering practices.