Research on Construction Technology of Outburst Prevention of High-pressure Harmful Gas in Tunnels at the Non-coal Measure Strata
Hongdoushan Tunnel of the Dalin railway encountered the outburst of high-pressure harmful gasbags when passing through the non-coal measure strata,which is the first case of non-coal gas outburst throughout the construction history of railway tunnels nationwide.This paper summed up three forms of high-pressure harmful gas outbursts in tunnels at the non-coal measure strata,investigated three action mechanisms of outburst prevention measures,and designed the outburst prevention process.Findings suggest that the integration of geophysical prospecting,advanced geological drilling and harmful gas detection is an effective means to evaluate and predict the risk of harmful gas outbursts.The outburst prevention measures that combine borehole discharge and high-pressure water injection were proposed and four safety measures were also put forward,that is,advanced geological drilling,harmful gas detection and monitoring,ventilation management,as well as emergency management.These research achievements were fully applied in the Hongdoushan Tunnel,giving a guarantee of the safety of the construction personnel,which can provide references for the construction of tunnels with harmful gas under similar complex geological conditions.
NETL
NSTL
万方数据
维普
