Identification of coal and gas outburst hazard during excavation for railway tunnel can lead to increased investment costs and extended construction timelines.This paper interpreted relevant content regarding the determination of coal and gas outburst hazard from the"Detailed Rules for Prevention and Control of Coal and Gas Outbursts,"the attachment of the Document Mei An Jian Ji Zhuang[2019]No.28 issued by the National Coal Mine Safety Administration.It further analyzed related requirements for assessing coal and gas outburst hazard stipulated in TB 10120-2019"Technical Code for Railway Gas Tunnels"issued by the National Railway Administration.By examining comparative case examples of coal and gas outburst hazard assessments in select railway tunnels,the study discussed the principles guiding such assessments across various stages of tunnel development.In the exploration stage,reasons for the inaccuracy of gas data obtained from borehole testing include:(1)inconsistency between the test depth within the borehole and the actual coal seam depth exposed during construction,and(2)excessive coal seam depth within the borehole compromising test precision.
coal and gas outburstoutburst-prone coal seamsoutburst hazard predictiongas pressure
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