Propagation characteristics and control technology of blasting vibration in neighborhood tunnel

Frontiers in Earth Science

Earth Science

Wencan Jiao¹  Zixiu Qin¹  Yihan Zhao²  Lu Chen³  Hongtao Cao³  Ling Zeng³  Hong Xu³ 

[1] Guangxi Xinfazhan Communication Group Co., Ltd., Nanning, China;Power China Zhongnan Engineering Corporation Limited, Changsha, China;School of Civil Engineering, Changsha University of Science and Technology, Changsha, China;

关键词: blasting vibration;    propagation characteristics;    vibration control;    cutting technology;    pre-splitting blasting;   

DOI  :  10.3389/feart.2023.1204450

 received in 2023-04-12, accepted in 2023-08-01,  发布年份 2023

来源: Frontiers

【 摘 要 】

During the tunnel construction process using the drilling and blasting method, the induced blasting vibration always poses a great threat to the stability and safety of the adjacent tunnel supporting structure. To improve the efficiency and safety of tunnel blasting construction, the vibration propagation and peak particle velocity (PPV) distribution of the lining of an excavated tunnel were investigated during the blasting of an adjacent tunnel located in Guangxi province. The evolution process and distribution characteristics of the PPV of the lining of adjacent tunnels were monitored and analyzed. The results show that the maximum blasting vibration velocity of the lining of the adjacent tunnel can be shown as: PPVx > PPVz > PPVy; hence, the PPVx plays a significant role in the vibration of the adjacent tunnel. According to the tensile stress failure criterion, the PPV threshold was determined to be 12.7 cm/s in this study. To control the damage of surrounding rock induced by the blasting vibration, compound wedge-shaped cutting technology, stress wave dislocation superposition technology, and pre-splitting blasting technology were employed to reduce the impact of blasting vibration on the excavated tunnel.

【 授权许可】

Unknown   
Copyright © 2023 Qin, Zhao, Chen, Cao, Zeng, Jiao and Xu.