渝怀二线新白沙沱隧道瓦斯突出及工区判定

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摘要 研究目的:渝怀铁路增建二线新白沙沱隧道四次穿过二叠系上统吴家坪组煤系地层,煤层层厚0.35～0.81 m不等,隧道设计和施工均需要确定瓦斯突出危险性及瓦斯工区类型。本文在调查、收集临近既有煤矿、铁路隧道煤层瓦斯资料的基础上,采用瓦斯压力梯度法计算并判定瓦斯突出危险性,采用绝对瓦斯涌出量公式计算并判定瓦斯工区类型,旨在为隧道结构设防、风险管理、施工组织等提供依据。
研究结论:(1)新白沙沱隧道埋深位于瓦斯风化带以下,场区瓦斯压力梯度约为4.5×10^-3~5.1×10^-3 MPa/m;(2)隧道揭煤处开挖工作面瓦斯初始压力超过了0.74 MPa的临界值,为瓦斯突出危险工作面;(3)隧道穿煤系地层段绝对瓦斯涌出量约为2.0~2.2 m³/min,为高瓦斯工区;(4)本研究成果可作为瓦斯隧道设计和施工依据,研究方法可为临近矿井和既有铁路的瓦斯隧道工区及突出判定提供参考。

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	张雄文
	杜宇本
	王科

关键词 ：新白沙沱隧道, 瓦斯压力, 瓦斯突出, 瓦斯绝对涌出量, 瓦斯工区

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

收稿日期: 2022-09-26

PACS:

U25

作者简介: ** 张雄文,1969年出生,男,教授级高级工程师。

引用本文:

张雄文, 杜宇本, 王科. 渝怀二线新白沙沱隧道瓦斯突出及工区判定[J]. 铁道工程学报, 2023, 40(2): 66-72.
ZHANG Xiongwen, DU Yuben, WANG Ke. Gas Outburst and Work Area Determination of the New Baishatuo Tunnel on Chongqing-Huaihua Second Railway. Journal of Railway Engineering Society, 2023, 40(2): 66-72.

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https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2023/V40/I2/66

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