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The Influence of Wall Roughness on the Ventilation Resistance Coefficient during Tunnel Construction Period
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Fayi Deng1, Guofeng Wang1, Kaifu Ren1, Heng Zhang2, Haiyan Xu3
Chinese Journal of Underground Space and Engineering | 2026, 22(2) : 714 - 723
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Chinese Journal of Underground Space and Engineering | 2026, 22(2): 714-723
The Influence of Wall Roughness on the Ventilation Resistance Coefficient during Tunnel Construction Period
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Fayi Deng1, Guofeng Wang1, Kaifu Ren1, Heng Zhang2, Haiyan Xu3
Affiliations
  • 1.Guizhou Road and Bridge Group Co., Ltd., Guiyang 550001, P. R. China
  • 2.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China
  • 3.School of Civil Engineering, Sichuan Agricultural University, Dujiangyan, Sichuan 611830, P. R. China
Published: 2026-04-20 doi: 10.20174/j.JUSE.2026.02.33
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Understanding the resistance coefficient along the tunnel wall is helpful to optimize the ventilation design of tunnel construction and improve the rationality of ventilation scheme. The influence of the height, shape and spacing of rough elements on the resistance coefficient along the tunnel wall is studied. Through the model test and the numerical model, the difference between the empirical formula and the numerical simulation results was explored. The results show that: With the higher height of the rough element on the tunnel wall, the influence on the resistance coefficient along the tunnel wall is less. The shape of rough elements on the tunnel wall has a great influence on the resistance coefficient along the tunnel, and the semi-spherical rough elements have the smallest resistance coefficient along the way. Comparing the calculated results of empirical formula with the numerical simulation results, the difference between them is relatively stable, which is related to the height of rough elements. The correction coefficient α is proposed for the empirical formula, and the corresponding relationship between α and the average roughness height Δ of the wall is α = 1.29+0.024 8Δ.

tunnel ventilation  /  rough wall  /  resistance coefficient along the way  /  numerical simulation  /  correction coefficient
Fayi Deng, Guofeng Wang, Kaifu Ren, Heng Zhang, Haiyan Xu. The Influence of Wall Roughness on the Ventilation Resistance Coefficient during Tunnel Construction Period[J]. Chinese Journal of Underground Space and Engineering, 2026 , 22 (2) : 714 -723 . DOI: 10.20174/j.JUSE.2026.02.33
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Article Info
doi: 10.20174/j.JUSE.2026.02.33
  • Receive Date：2025-06-25
  • Online Date：2026-06-17
  • Published：2026-04-20
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  • Received：2025-06-25
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Affiliations
    1.Guizhou Road and Bridge Group Co., Ltd., Guiyang 550001, P. R. China
    2.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China
    3.School of Civil Engineering, Sichuan Agricultural University, Dujiangyan, Sichuan 611830, P. R. China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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