Citation

Wu B, Lan Y, Yang J, Han Y, Pang X. China Saf. Sci. J. 2019; 29(11): 89-95.

Copyright

(Copyright © 2019, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2019.11.015

PMID

unavailable

Abstract

In order to ensure safe operation of existing Hangzhou-Shenzhen railway while adjacent tunnels under blasting construction, by using field monitoring and numerical simulation, study was conducted on vibration characteristics and stress distribution law of existing tunnel lining under blasting dynamic load of adjacent new tunnel. Then FLAC3D was adopted to simulate influence of blast on operating tunnels, safety of blasting scheme adopted in the field was briefly evaluated and corresponding explosion control measures were provided. The results show that during blasting construction of new tunnels, vibration velocity of arch waist of existing tunnel lining is larger than that of arch foot, and radial vibration velocity of arch waist is larger than that of other directions. Lining stress comes to maximum at arch waist of operating tunnels under blasting load and blasting will have an impact on running trains, so footage excavation shall be reduced or construction shall be carried out in periods when trains are not in operation. © 2019 China Safety Science Journal. All rights reserved.

Language: zh