Analysis and Optimization of Flow Field near Cross Passage of Highway Tunnel with Low Gas Content

doi:10.3973/j.issn.2096-4498.2018.S1.015

Tunnel Construction ›› 2018, Vol. 38 ›› Issue (S1): 97-103.DOI: 10.3973/j.issn.2096-4498.2018.S1.015

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Analysis and Optimization of Flow Field near Cross Passage of Highway Tunnel with Low Gas Content

HUANG Lei¹, FAN Jianguo², TANG Xie³, FANG Yong⁴

(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)

Received:2017-11-14 Revised:2018-03-28 Online:2018-06-15 Published:2018-06-19

Abstract

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.

Key words: low gas content, highway tunnel, gallery ventilation, cross passage, dead zone, numerical simulation

CLC Number:

U 45

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(S1): 97-103.

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Analysis and Optimization of Flow Field near Cross Passage of Highway Tunnel with Low Gas Content

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