瓦斯隧道多工作面施工通风死区控制方法研究  

Study on a control method of ventilation dead zone in gas tunnel construction with multiple working faces

作　　者：赵树磊 叶爱军 李冰 崔鹏杰 郭春[1] ZHAOO Shuleil;YE Aijun;LI Bing;CUI Pengjie;GUO Chun(Key Laboratory of Transportation Tunnel Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Construction Kunlun Investment Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,成都610031 [2]中国铁建昆仑投资集团有限公司,成都610031

出　　处：《安全与环境学报》2024年第1期118-126,共9页Journal of Safety and Environment

基　　金：四川省社会科学规划项目(SC22B031);四川省交通运输科技项目(2021-ZL-04);四川省教育科研资助金项目(SCJG20A120);中国交通教育研究会教育科学研究课题项目(JT2022YB163,JT2022YB405)。

摘　　要：针对瓦斯隧道多工作面作业时,易形成施工通风死区这一安全问题,以阳宗公路瓦斯隧道为依托工程,对压入式通风方案中风管最优布设方式进行研究,并在此基础上确定射流风机的最佳布设距离,进而探究多作业面通风系统中的射流风机最佳布设方案。研究结果显示:在满足最低需风量的压入式通风方案中,不同的风管布设方案会使隧道内通风死区体积变化较大,为控制并消除通风死区,风管出口应尽可能靠近掌子面且风管直径不宜过大;随着隧道掘进距离的增加,在掌子面前方会形成固定范围的非通风死区,此时为布设射流风机的最佳距离;射流风机的布设能有效地消除通风死区,但其作用范围有限,当隧道距离过长时,应有序间隔布设射流风机。To explore the best way to control the ventilation dead zone in the gas tunnel,this paper takes the Yangzong Tunnel as the engineering support and uses the method of combining numerical simulation and field to first study the optimal layout of the air duct in the press-in ventilation scheme,determine the optimal distance from the outlet of the air duct to the face and the optimal diameter of the air duct,and determine the optimal layout distance and spacing distance of the jet fan on this basis.Furthermore,the optimal layout scheme of jet fans for contrlling the ventilation dead zone in the multi-working face ventilation system of the gas tunnel is explored.The research results show that:in the press-in ventilation scheme meeting the minimum required air volume,different duct diameters,and the distance between the duct outlet and the tunnel face not only leads to different gas dilution effects in the tunnel but also leads to large changes in the volume of the ventilation dead zone.To better control the ventilation dead zone and ensure the best gas dilution effect,the duct diameter should not be too large and the duct outlet should not be too far from the tunnel face.With the increase of tunnel excavation distance,a fixed range of nonventilated dead zone will be formed in front of the tunnel.The dead zone range is a certain distance in front of the cross passage.Considering the economy of the construction scheme,jet fans need to be arranged in the tunnel to ensure construction safety;The arrangement of jet fans can effectively eliminate the dead zone of ventilation,but its effective range is limited.When the tunnel distance is too long,jet fans should be arranged in sequence.In this case,the effective range of jet fans is 150 m from the tunnel face.

关 键 词：安全工程 瓦斯隧道 通风死区 数值模拟 瓦斯分布 

分 类 号：X947[环境科学与工程—安全科学]