大断面隧道瓦斯涌出位置对瓦斯分布的影响规律  

Influence of Gas Emission Position on the Distribution of Gas in Large-section Tunnel

作　　者：安俊杰 黄飞[2,3] 刘刚 王少龙 黄小亮 AN Jun-jie;HUANG Fei;LIU Gang;WANG Shao-long;HUANG Xiao-liang(Meng Xing Engineering Co.,Ltd.,CCCC-SHEC,Xi'an 710119,China;The SAWS Laboratory of Prevention and Controlling the Roof,Coal and Gas Outburst in Coal Mine of South China,Hunan University of Science and Technology,Xiangtan 411201,China;State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Henan Polytechnic University,Jiaozuo 454003,China)

机构地区：[1]中交二公局萌兴工程有限公司,西安710119 [2]湖南科技大学南方煤矿顶板及煤与瓦斯突出灾害预防控制应急管理部重点实验室,湘潭411201 [3]河南理工大学河南省瓦斯地质与瓦斯治理重点实验室省部共建国家重点实验室培育基地,焦作454003

出　　处：《科学技术与工程》2023年第29期12705-12713,共9页Science Technology and Engineering

基　　金：国家自然科学基金面上项目(52274198);湖南省自然科学基金面上项目(2022JJ30252);河南省瓦斯地质与瓦斯治理重点实验室—省部共建国家重点实验室培育基地开放基金(WS2021A02)。

摘　　要：大断面瓦斯隧道掌子面上不同的涌出位置对隧道内的瓦斯扩散分布规律影响较大。基于何家坡大断面隧道穿越一定交角煤层的工程背景,采用计算流体动力学软件Fluent模拟了5个不同涌出位置的瓦斯在隧道内的扩散分布规律。研究结果表明:大断面隧道掌子面可划分为3个主要的瓦斯涌出区域,即风筒对侧左下部分(区域Ⅰ)、靠近风筒侧右上部分(区域Ⅲ)和中间部分(区域Ⅱ);瓦斯自掌子面涌出后向洞口扩散的过程依次可以概括为瓦斯聚集、瓦斯扩散与瓦斯稳定分布3个阶段;区域Ⅰ、Ⅱ与Ⅲ涌出的瓦斯分别在0.4H、0.8H与1.3H范围内聚集,并分别在1.2H、1.4H与1.9H范围内扩散,最终分别在1.2H、1.4H与1.9H范围以外稳定分布于拱顶稍偏向风筒对侧,其中,H为隧道的高度。在此基础上,对隧道内瓦斯监测传感器的布局提出了优化方案,可为瓦斯隧道施工中的瓦斯监测及传感器布置提供一定的理论借鉴。The gas emission position on the heading face of large-section tunnel has great influence on gas distribution.Based on Hejiapo gas tunnel with a large-section passing through coal seam,an computational fluid dynamics software Fluent was applied to simulate the gas distribution under the conditions of five different gas emission positions.It is concluded that it can be mainly divided into three areas of gas emission.In detail,they are the left lower part on the opposite side of ventilation tube,near the upper right part of the ventilation tube and the middle part,namely area Ⅰ,Ⅱ and Ⅲ.The diffusion process of gas from heading face to tunnel entrance can be divided into three stages,which are gas accumulation stage,gas diffusion stage and stable distribution stage.The axial distances of accumulation stage of area Ⅰ,Ⅱ and Ⅲ are about 0.4H,0.8H and 1.3H.The axial distances of gas diffusion stage of area Ⅰ,Ⅱ and Ⅲ are about 1.2H,1.4H and 1.9H.The axial distances of stable distribution stage of area Ⅰ,Ⅱ and Ⅲ are much larger than 1.2H,1.4H and 1.9H,H is the height of the tunnel.An optimized layout of the gas sensors in the tunnel was proposed on the research results,which can provide theoretical support for gas monitoring and sensor layout during excavation of gas tunnel.

关 键 词：大断面隧道 瓦斯涌出位置 瓦斯分布 数值模拟 

分 类 号：U453.5[建筑科学—桥梁与隧道工程]