CO Migration Rule and Ventilation Countermeasure Based on Tunnel Blasting Procedure

DOI

10.2991/978-94-6463-856-1_27How to use a DOI?

Keywords

carbon monoxide; blasting; field monitoring; tunnel ventilation; local fan

Abstract

In the process of drilling and blasting construction of mountain tunnel, CO gas produced by blasting will endanger the life safety of construction personnel, and the construction progress will be affected if CO emission is not timely. Based on the construction of a mountain tunnel by drilling and blasting method in Yunnan province, the amount of CO produced during blasting is calculated theoretically, and the variation rule of CO concentration with time is obtained from the actual measurement. The numerical calculation model of tunnel ventilation is established, the migration rule of CO gas during ventilation after blasting is analyzed, and the ventilation strategies of different construction areas of the tunnel (at and away from the face of the tunnel) are given. The research conclusions are as follows: The field measured CO concentration surges during blasting, and decreases to the safe concentration after 171min of ventilation. The field ventilation time is much higher than the standard requirements, indicating that the actual ventilation wind speed of the tunnel does not meet the needs of ventilation. The numerical calculation shows that the concentration of CO in different areas of the tunnel increases first and then decreases with time. The farther away from the face of the palm, the lower the maximum concentration of CO, and the longer the retention time of CO air mass. After 1h ventilation, CO concentration in the area beyond 1500m from the tunnel face failed to decrease to the allowable concentration. If the wind speed of the air duct outlet is attenuated, the reach time of CO concentration in the tunnel face area will increase significantly. When the wind speed is attenuated by 30%, the reach time of CO concentration increases from 424.5s to 1393s. After adding a local fan 1500m away from the face of the palm, the maximum CO concentration and the retention time in each area decreased, and the CO concentration in all areas could be reduced to the allowable concentration after 1h ventilation.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Lijun Wang
AU  - Xiaobin Duan
AU  - Yonggui Zhang
AU  - Junbo Chen
AU  - Yulin Wang
AU  - Yinfei Yang
AU  - Anmin Wang
AU  - Jiayin He
PY  - 2025
DA  - 2025/09/22
TI  - CO Migration Rule and Ventilation Countermeasure Based on Tunnel Blasting Procedure
BT  - Proceedings of the 2025 International Conference on Resilient City and Safety Engineering (ICRCSE 2025)
PB  - Atlantis Press
SP  - 280
EP  - 292
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-856-1_27
DO  - 10.2991/978-94-6463-856-1_27
ID  - Wang2025
ER  -