低瓦斯公路隧道横通道附近流场分析及优化
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摘要
在公路隧道建设过程中,施工机械产生的废气以及从隧道围岩渗漏出来的有毒有害气体会对施工安全造成一定的影响。针对米仓山公路隧道巷道式通风系统横通道附近瓦斯不能及时排出的问题,通过CFD数值模拟对横通道附近空气流动和危险气体的扩散规律进行研究。结果表明:沿横通道向掌子面方向的部分区域存在风速小于0.5 m/s的危险区域。为达到消除危险区域的目的,提出增大隧道进口风速、增大风管出口风速和增设射流风机3种方法对横通道附近流场进行优化。通过对比分析发现:增设射流风机是消除危险区域最有效的措施,并且当在进风隧道横通道前方50 m处设置射流风机时,可使得整个隧道中不存在危险区域。
During the construction of highway tunnel,the gas produced by the construction machinery and the poisonous gas outburst from the surrounding rocks of the tunnel will have potential influence on tunnel construction safety. During the construction of Micangshan Highway Tunnel,the gas near the cross passage can not be discharged timely by gallery ventilation system,as a result,the air flow and the gas diffusion rules are studied by CFD numerical simulation method.The study results show that there is a " dead zone" ahead of the cross passage which has a much lower air velocity less than 0. 5 m/s. In order to optimize the flow field near the cross passage and eliminate the " dead zone",optimizations are carried out on flow field near cross passage in terms of increasing the inlet air velocity of tunnel entrance and outlet air velocity of air duct and adding jet fan. The comparison results show that the method of adding jet fan is the optimum.The " dead zone" will be eliminated by setting jet fan 50 m ahead of cross passage.
During the construction of highway tunnel,the gas produced by the construction machinery and the poisonous gas outburst from the surrounding rocks of the tunnel will have potential influence on tunnel construction safety. During the construction of Micangshan Highway Tunnel,the gas near the cross passage can not be discharged timely by gallery ventilation system,as a result,the air flow and the gas diffusion rules are studied by CFD numerical simulation method.The study results show that there is a " dead zone" ahead of the cross passage which has a much lower air velocity less than 0. 5 m/s. In order to optimize the flow field near the cross passage and eliminate the " dead zone",optimizations are carried out on flow field near cross passage in terms of increasing the inlet air velocity of tunnel entrance and outlet air velocity of air duct and adding jet fan. The comparison results show that the method of adding jet fan is the optimum.The " dead zone" will be eliminated by setting jet fan 50 m ahead of cross passage.
引文
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[3]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.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.
[4]彭佩.有毒有害气体公路隧道射流巷道式施工通风技术研究[D].成都:西南交通大学,2014.PENG Pei.Research on jet gallery ventilation technology of toxic and harmful gas in highway tunnel construction[D].Chengdu:Southwest Jiaotong University,2014.
[5]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.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.
[6]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.WANG Xiaomin,FANG Yong.Construction ventilation scheme for the Huayingshan extra-long tunnel on the Nanchong-Dazhu-Liangping expressway[J].Modern Tunnelling Technology,2013,50(4):188.
[7]石平,程久胜.乌池坝特长公路隧道通风方案设计[J].现代隧道技术,2007,44(2):72.SHI Ping,CHENG Jiusheng.Ventilation design option for Wuchiba super-long highway tunnel[J].Modern Tunnelling Technology,2007,44(2):72.
[8]PARRA M T,VILLAFRUELA J M,CASTRO F,et al.Numerical and experimental analysis of different ventilation systems in deep mines[J].Building and Environment,2006,41(2):87.
[9]HARGREAVES D M,LOWNDES I S.The computational modeling of the ventilation flows within a rapid development drivage[J].Tunnelling and Underground Space Technology,2007,22(2):150.
[10]王海桥,施式量,刘荣华.独头巷道附壁射流通风流场数值模拟研究[J].煤炭学报,2004,29(4):425.WANG Haiqiao,SHI Shiliang,LIU Ronghua.Numerical simulation study on ventilation flow field of wall-attached jet in heading face[J].Journal of China Coal Society,2004,29(4):425.
[11]FANG Y,FAN J G,KENNEALLY B,et al.Air flow behavior and gas dispersion in the recirculation ventilation system of a twin-tunnel construction[J].Tunnelling and Underground Space Technology,2016,58(9):30.
[12]KURNIA J C,SASMITO A P,MUJUMDAR A S.Simulation of a novel intermittent ventilation system for underground mines[J].Tunnelling and Underground Space Technology,2014,42(5):206.
[13]王联,李海清,卢义玉,等.公路瓦斯隧道等级划分研究[J].西南公路,2009(4):154.WANG Lian,LI Haiqing,LU Yiyu,et al.Study of classification of highway gas tunnels[J].Southwest Highway,2009(4):154.