基于数值模拟-多元线性回归的大断面隧道平均瓦斯浓度检测位置研究  

Study on Detection Location of Average Gas Concentration in a Large Section Tunnel Based on Numerical Simulation-multiple Regression

作　　者：苗回归 黄飞 李树清[1,2] 罗亚飞 苗德华[1] 焦杨洋 MIAO Huigui;HUANG Fei;LI Shuqing;LUO Yafei;MIAO Dehua;JIAO Yangyang(School of Resource&Environmental and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201;Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines,Hunan University of Science and Technology,Xiangtan 411201)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湘潭411201 [2]湖南科技大学南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室,湘潭411201

出　　处：《现代隧道技术》2023年第5期128-135,共8页Modern Tunnelling Technology

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);2022年度湖南省交通运输科技项目(202243)。

摘　　要：大断面隧道瓦斯浓度检测的不精确性会导致隧道绝对瓦斯涌出量实测值与真实值存在较大偏差,最终影响隧道瓦斯工区的划分,给隧道安全施工和成本控制带来巨大挑战。利用计算流体力学软件Fluent对隧道内部瓦斯分布规律进行模拟,通过正交试验定性分析断面宽度(A)、断面高度(B)、断面风速(C)对隧道断面平均瓦斯浓度的影响,并采用多元线性回归方法确定平均瓦斯浓度的最佳检测位置。研究表明,通风稳定条件下,隧道内部瓦斯呈稳定分布,且在隧道断面上会出现自上而下明显的分层分布;不同瓦斯工区条件下,断面宽度(A)、断面高度(B)、断面风速(C)对隧道断面平均瓦斯浓度影响的主次顺序存在差异;通过多元线性回归定量分析,得到不同瓦斯工区条件下稳定层流区域断面平均瓦斯浓度检测位置的计算模型。The imprecision of gas concentration detection in the large cross-section tunnel can lead to significant de⁃viation between the measured absolute gas emission quantity and the actual value,ultimately affecting the division of gas working areas in the tunnel and posing a huge challenge to tunnel construction safety and cost control.In this study,the computational fluid dynamics software Fluent is used to simulate the distribution law of gas inside the tun⁃nel.The influence of section width(A),section height(B),and section wind speed(C)on the average gas concentra⁃tion in the tunnel section is qualitatively analyzed through the orthogonal test method.Furthermore,multiple linear regression is used to determine the optimal detection location for the average gas concentration.The research has shown that under stable ventilation conditions,the gas inside the gas tunnel exhibits a stable distribution,and there will be obvious layered distribution from top to bottom on the tunnel cross-section.There are differences in primary and secondary sequence of the influence of section width(A),section height(B),and section wind speed(C)on the average gas concentration of tunnel sections under different gas working area conditions.Through quantitative multi⁃ple linear regression analysis,a calculation model for the average gas concentration detection location on the crosssection of stable laminar flow areas under different gas working area conditions is obtained.

关 键 词：公路隧道 平均瓦斯浓度值 数值模拟 正交试验 多元线性回归 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]