| 低瓦斯公路隧道横通道附近流场分析及优化 |
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| 引用本文： | 黄磊,范建国,唐协,方勇.低瓦斯公路隧道横通道附近流场分析及优化[J].隧道建设,2018,38(Z1):97-103. |
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| 作者姓名： | 黄磊 范建国 唐协 方勇 |
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| 作者单位： | （1. 西南交通大学土木工程学院， 四川成都 610031； 2. 北京城建设计发展集团股份有限公司， 北京 100045； 3. 四川省交通运输厅公路规划勘察设计研究院， 四川成都 610041； 4. 西南交通大学交通隧道工程教育部重点实验室， 四川成都 610031） |
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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。
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| 关 键 词： | 低瓦斯 公路隧道 巷道式通风 横通道 危险区域 数值模拟 |
| 收稿时间： | 2017-11-14 |
| 修稿时间： | 2018-03-28 |
Analysis and Optimization of Flow Field near Cross Passage of Highway Tunnel with Low Gas Content |
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| HUANG Lei,FAN Jianguo,TANG Xie,FANG Yong.Analysis and Optimization of Flow Field near Cross Passage of Highway Tunnel with Low Gas Content[J].Tunnel Construction,2018,38(Z1):97-103. |
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| Authors: | HUANG Lei FAN Jianguo TANG Xie FANG Yong |
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| Institution: | (1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. Beijing Urban Construction Design & Development Group Co., Ltd., Beijing 100045, China; 3. Highway Planning, Survey, Design & Research Institute of Sichuan Provincial Communications Department, Chengdu 610041, Sichuan, China; 4. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China) |
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| Abstract: | 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. |
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| Keywords: | low gas content highway tunnel gallery ventilation cross passage dead zone numerical simulation |
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