南大梁高速公路华蓥山隧道施工通风优化研究
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摘要
射流巷道式通风是一种常见的施工通风方式。为探明巷道式通风的流场及污染物分布特征,文章以南大梁高速公路华蓥山隧道为工程背景,采用流体力学软件Fluent建立了射流巷道式通风的三维数值模型,研究了隧道内的通风流场,以及隧道穿越煤矿采空区时硫化氢涌出情况下有毒有害气体在隧道内的分布情况。结果表明,现有通风风量分配不够合理,导致隧道内存在低风速区,有害气体浓度较高;其问题可通过增加对掌子面供风量和设置局扇的方式来解决;当风管风速达到26 m/s时,低风速区完全消失;在横通道前设置局扇,也可以使隧道内风速达到2 m/s,同样可以消除低风速区。
Jet flow gallery ventilation is a common method of construction ventilation. In order to investigate the flow field and the distribution of pollutants of gallery ventilation, it established a three-dimensional numerical model with fluid dynamic software Fluent based on Huayingshan tunnel project, studied the ventilation flow field and the distribution of hazardous gases in condition of sulfureted hydrogen gushing when tunnel passes through mined-out area. The results show that air distribution of current ventilation mode is unreasonable and results in a low air velocity zone with high concentration of hazardous gases. This problem can be solved by increasing air supply volume at tunnel face and installing local ventilation fans. When air velocity reaches 26 m/s in air duct the low air velocity zone disappears completely. With local ventilation fans in front of the cross passage, the air velocity in tunnel can reach 2 m/s and the low air velocity zone can also be eliminated.
Jet flow gallery ventilation is a common method of construction ventilation. In order to investigate the flow field and the distribution of pollutants of gallery ventilation, it established a three-dimensional numerical model with fluid dynamic software Fluent based on Huayingshan tunnel project, studied the ventilation flow field and the distribution of hazardous gases in condition of sulfureted hydrogen gushing when tunnel passes through mined-out area. The results show that air distribution of current ventilation mode is unreasonable and results in a low air velocity zone with high concentration of hazardous gases. This problem can be solved by increasing air supply volume at tunnel face and installing local ventilation fans. When air velocity reaches 26 m/s in air duct the low air velocity zone disappears completely. With local ventilation fans in front of the cross passage, the air velocity in tunnel can reach 2 m/s and the low air velocity zone can also be eliminated.
引文
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[13]文珂.乌鞘岭隧道斜井施工通风研究与实施[J].现代隧道技术,2006,43(3):67-71.WEN Ke.Investigation and Implementation of Construction Ventilation for an Inclined Shaft of Wushaoling Tunnel[J].Modern Tunnelling Technology,2006,43(3):67-71.
[14]辛国平.长大隧道分隔巷道与风管联合通风施工技术[J].现代隧道技术,2015,52(6):184-189.XIN Guoping.Combined Separated Duct and Vent Pipe Ventilation Techniques for a Long Tunnel with a Large Section[J].Modern Tunnelling Technology,2015,52(6):184-189
[15]夏丰勇,宋神友,谢永利,王亚琼.双洞互补式通风在公路隧道中的应用[J].现代隧道技术,2017,54(4):160-166.XIA Fengyong,SONG Shenyou,XIE Yongli,WANG Yaqiong.Application of Twin-tube Complementary Ventilation in Highway Tunnels[J].Modern Tunnelling Technology,2017,54(4):160-166.
[2]高玄涛.山岭隧洞施工中的通风与防尘[J].河南城建学院学报,2010,19(4):23-28.GAO Xuantao.Ventilation and Dust Control in Construction of Mountainous Tunnels[J].Journal of Henan University of Urban Construction,2010,19(4):23-28.
[3]张皓,赵子成,刘建明,等.公路隧道压入式施工通风有毒有害气体现场测试研究[J].公路,2014,(10):274-280.ZHANG Hao,ZHAO Zicheng,LIU Jianming,et al.The Field Test Research of the Toxic and Harmful Gas Based on Press-in Ventilation of Highway Tunnel[J].Highway,2014,(10):274-280.
[4]徐湘.关虎冲特长公路隧道施工通风技术方案设计[J].公路工程,2011,36(4):112-114.XU Xiang.The Ventilation Technique Project Design of Guan Huchong Specially Long Highway Tunnel under Construction[J].Highway Engineering,2011,36(4):112-114.
[5]张雪金,冉钊,李福荣.乐园铁路瓦斯隧道施工通风方案设计[J].西部交通科技,2014,(8):66-72.ZHANG Xuejin,RAN Zhao,LI Furong.Construction Ventilation Program Design of Leyuan Railway Gas Tunnel[J].Western China Communications Science&Technology,2014(8):66-72.
[6]杨家松.特长隧道采用巷道式射流施工通风技术与工程应用[J].隧道建设,2008,28(4):456-459.YANG Jiasong.Study on Gallery-type Jet Construction Ventilation Technology for Super-long Tunnel and Its Application in Works[J].Tunnel Construction,2008,28(4):456-459.
[7]张磊,李永福,孙杰,等.瓦斯隧道施工通风流场及瓦斯迁移研究[J].地下空间与工程学报,2014,10(1):184-190.ZHANG Lei,LI Yongfu,SUN Jie,et al.Research on Flow Field and Gas Transportation of Construction Ventilation in Gas Tunnel[J].Chinese Journal of Underground Space and Engineering,2014,10(1):184-190.
[8]彭佩,方勇,周超月,等.隧道施工压入式通风效果分析及参数优化研究[J].铁道标准设计,2014,58(7):102-106.PENG Pei,FANG Yong,ZHOU Chaoyue,et al.Effect Analysis and Parameter Optimization of Forced Ventilation during Tunneling[J].Railway Standard Design,2014,58(7):102-106.
[9]张雪金,方勇,彭佩,等.隧道施工开挖面瓦斯涌出及扩散规律研究[J].公路交通科技,2015,32(2):119-126.ZHANG Xuejin,FANG Yong,PENG Pei,et al.Study on Regularity of Gas Emission and Diffusion at Tunnel Face during Tunnel Construction[J].Journal of Highway and Transportation Research and Development,2015,32(2):119-126.
[10]李刚,杨敏,黄儒钦.隧道施工环境中有限空间附壁射流的试验研究[J].西南交通大学学报,2000,35(2):137-140.LI Gang,YANG Min,HUANG Ruqin.Experimental Study on the Wall Jet in Defined Space during Tunnel Construction[J].Journal of Southwest Jiaotong University,2000,35(2):137-140.
[11]方勇,彭佩,赵子成,等.风管出口位置对隧道施工通风效果影响的研究[J].地下空间与工程学报,2014,10(2):468-473.FANG Yong,PENG Pei,ZHAO Zicheng,et al.Numerical Simulation of the Effect of Outlet Position of Air Duct on the Construction Ventilation of the Tunnel[J].Chinese Journal of Underground Space and Engineering,2014,10(2):468-473.
[12]王小敏,方勇.南大梁高速公路华蓥山特长隧道施工通风方案[J].现代隧道技术,2013,50(4):188-196.WANG Xiaomin,FANG Yong.Construction Ventilation Scheme for the Huayingshan Extra-Long Tunnel on the Nanchong-DazhuLiangping Expressway[J].Modern Tunnelling Technology,2013,50(4):188-196.
[13]文珂.乌鞘岭隧道斜井施工通风研究与实施[J].现代隧道技术,2006,43(3):67-71.WEN Ke.Investigation and Implementation of Construction Ventilation for an Inclined Shaft of Wushaoling Tunnel[J].Modern Tunnelling Technology,2006,43(3):67-71.
[14]辛国平.长大隧道分隔巷道与风管联合通风施工技术[J].现代隧道技术,2015,52(6):184-189.XIN Guoping.Combined Separated Duct and Vent Pipe Ventilation Techniques for a Long Tunnel with a Large Section[J].Modern Tunnelling Technology,2015,52(6):184-189
[15]夏丰勇,宋神友,谢永利,王亚琼.双洞互补式通风在公路隧道中的应用[J].现代隧道技术,2017,54(4):160-166.XIA Fengyong,SONG Shenyou,XIE Yongli,WANG Yaqiong.Application of Twin-tube Complementary Ventilation in Highway Tunnels[J].Modern Tunnelling Technology,2017,54(4):160-166.
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