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Study on Monitoring and Prevention Technique for Harmful Gas in No.1
Inclined Shaft of Hongdoushan Tunnel
(1 School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500；2 China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610036)
Abstract High-pressure harmful gas burst occurs in the No. 1 inclined shaft of Hongdoushan tunnel during the
construction, and the high-pressure gas is mainly consist of CO2, H2S with high concentration, small amount of CO and H2 and other harmful gases, resulting in major safety risks for tunnel construction. Based on the characteristics of the harmful gas and the tunnel construction conditions, it presents a monitoring scheme mainly composing of automatic monitoring system and manual real-time inspection. By sorting out and analyzing the monitoring data, the concentration, distribution and escape characteristics of harmful gases are summarized, and a prevention technique for high-pressure and high-concentration harmful gases in advance drilling and working face drilling is proposed in light of the characteristics of different harmful gases, which mainly includes blowout prevention in advance drilling,real-time monitoring of gas pressure in boreholes, real-time monitoring of composition and concentration of harmful gas and ventilation velocity monitoring.
Abstract：
High-pressure harmful gas burst occurs in the No. 1 inclined shaft of Hongdoushan tunnel during the
construction, and the high-pressure gas is mainly consist of CO2, H2S with high concentration, small amount of CO and H2 and other harmful gases, resulting in major safety risks for tunnel construction. Based on the characteristics of the harmful gas and the tunnel construction conditions, it presents a monitoring scheme mainly composing of automatic monitoring system and manual real-time inspection. By sorting out and analyzing the monitoring data, the concentration, distribution and escape characteristics of harmful gases are summarized, and a prevention technique for high-pressure and high-concentration harmful gases in advance drilling and working face drilling is proposed in light of the characteristics of different harmful gases, which mainly includes blowout prevention in advance drilling,real-time monitoring of gas pressure in boreholes, real-time monitoring of composition and concentration of harmful gas and ventilation velocity monitoring.
CHEN Zhongyong1 SU Peidong1 HUANG Lu1 CHEN Haodong1 DU Yuben2
.Study on Monitoring and Prevention Technique for Harmful Gas in No.1
Inclined Shaft of Hongdoushan Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(4): 178-184
2020, Vol. 57 