Influence of new tunnel blasting on vibration characteristics of adjacent existing tunnel

doi:10.16265/j.cnki.issn1003-3033.2019.11.015

Abstract

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 FLAC^3D 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.

Key words: existing tunnel, blasting construction, site monitoring, numerical simulation, vibration characteristics

CLC Number:

X932

WU Bo, LAN Yangbin, YANG Jianxin, HAN Yalong, PANG Xiaoyu. Influence of new tunnel blasting on vibration characteristics of adjacent existing tunnel[J]. China Safety Science Journal, 2019, 29(11): 89-95.

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