渝怀二线新白沙沱隧道瓦斯突出及工区判定

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Abstract Research purposes:The New Baishatuo tunnel of Chongqing-Huaihua second railway passes through the coal measure strata of Wujiaping formation of the Upper Permian system four times. The thickness of coal seam varies from 0.35 to 0.81 m. It is necessary to determine the risk of gas outburst and the type of gas work area for tunnel design and construction. Based on the investigation and collection of coal seam gas data of adjacent existing coal mines and railway tunnels, this paper uses the gas pressure gradient method to calculate and determine the risk of gas outburst, and uses the absolute gas emission formula to calculate and determine the type of gas work area, so as to provide a basis for tunnel structure fortification, risk management and construction organization.
Research conclusions:(1) The New Baishatuo tunnel is buried below the gas weathering zone, and the gas pressure gradient in the site is about 4.5×10^-3~5.1×10^-3 MPa/m. (2) The initial gas pressure of the excavation working face at the tunnel coal uncovering place exceeds the critical value of 0.74 MPa, which is a dangerous working face with gas outburst. (3) The absolute gas emission of the tunnel through coal measures is about 2.0~2.2 m³/min, which is a high gas work area. (4) The research results can be used as the basis for the design and construction of gas tunnels. The research method can provide reference for determining the type of gas tunnel work area and outburst adjacent to mines and existing railways.

Key words： New Baishatuo tunnel gas pressure gas outburst absolute gas emission quantity work area with gas

Received: 26 September 2022

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U25

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	ZHANG Xiongwen
	DU Yuben
	WANG Ke

Cite this article:

ZHANG Xiongwen,DU Yuben,WANG Ke. Gas Outburst and Work Area Determination of the New Baishatuo Tunnel on Chongqing-Huaihua Second Railway[J]. Journal of Railway Engineering Society, 2023, 40(2): 66-72.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2023/V40/I2/66

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