公路隧道突遇含瓦斯煤层的应急施工技术  

Emergency Construction Technology of Highway Tunnel Encountering Gas Bearing Coal Seam

作　　者：徐至任 黄飞 李树清[1,2] 龙港 刘勇[3] 罗太友 XU Zhiren;HUANG Fei;LI Shuqing;LONG Gang;LIU Yong;LUO Taiyou(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Work Safety Key Lab on Prevention and Control of Gas and Roof Disaster for Southern Coal Mines,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;Guiyang Jingshuo Safety Technology Co.,Ltd.,Guiyang 550081,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭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,湖南湘潭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,河南焦作454003 [4]贵阳景烁安全科技有限公司,贵州贵阳550081

出　　处：《矿业工程研究》2023年第1期54-58,共5页Mineral Engineering Research

基　　金：国家自然科学基金资助项目(52274198);湖南省自然科学基金资助项目(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资助项目(WS2021A02)。

摘　　要：为了解决公路隧道突遇含瓦斯煤层时的安全揭煤施工问题,针对鸡鸣隧道在实际掘进中比预计提前390 m遇见M1煤层的紧急状况,提出公路隧道突遇煤层的应急施工措施:首先,立即停止隧道内所有施工并加强通风;其次,及时对掌子面进行喷浆稳固围岩;最后,组织开展超前钻探,获取煤层产状和瓦斯参数,根据钻探数据制定防突措施并开展煤层消突处置.工程实践结果表明:(1)M1煤层的真厚度约为1.42 m,煤层倾角约为70°,与隧道轴向的交角约为88°;(2)M1煤层与掌子面的最小法向距离为2.60 m,根据提出的应急方案直接开展局部“四位一体”消突措施;(3)局部消突措施检验达标后一次性顺利揭穿M1煤层.该方案为依托工程的安全揭煤提供了技术保障,并进一步完善了隧道揭煤防突的工作流程,可为同类型隧道揭煤施工提供参考.In order to safely uncover coal seams when highway tunnels encounter gas bearing coal seams,and in view of the emergency construction situation when Jiming Tunnel meets M1 coal seams 390 m ahead of the design data during tunneling,emergency construction measures for highway tunnels that encounter coal seams are proposed.First,immediately stop all construction in the tunnel and strengthen ventilation;secondly,timely spray slurry on the face to stabilize the surrounding rock;then,organize advance drilling to obtain the coal seam occurrence and gas parameters.According to drilling data,outburst prevention measures shall be formulated and outburst elimination measures shall be carried out for coal seams.Results of engineering practice show that(1)The true thickness of the M1 coal seam is about 1.42 m,the dip angle of the coal seam is about 70°,and the intersection angle with the tunnel axis is about 88°.(2)The minimum normal distance between the M1 coal seam and the working face is 2.60 m.According to the proposed emergency measures,local“four in one”outburst elimination measures are directly carried out,and(3)after the inspection of local outburst elimination measures reaches the standard,the M1 coal seam is successfully exposed at one time.This technology provides a technical guarantee for the safety of coal uncovering relying on the project,and further improves the work process of coal uncovering and outburst prevention in tunnels,which can provide a reference for coal uncovering construction in the same type of tunnels.

关 键 词：瓦斯隧道 瓦斯含量 应急措施 隧道揭煤 

分 类 号：U455[建筑科学—桥梁与隧道工程]