对隧道壁面沿程阻力系数的认识有助于优化隧道施工通风设计,提高通风方案的合理性。本研究探讨了隧道壁面粗糙单元高度、形状及间距等对沿程阻力系数的具体影响,通过模型试验及数值分析,探究了计算沿程阻力系数的经验公式结果与数值模拟结果的差异。研究结果表明:隧道壁面粗糙单元高度越高,对沿程阻力系数影响趋势逐渐减小;隧道壁面粗糙单元形状对沿程阻力系数影响较大,半球形粗糙单元对应的沿程阻力系数最小;比较沿程阻力系数经验公式计算结果与数值模拟结果,两者的差距较为稳定,与粗糙单元高度有关;对经验公式提出修正系数α,得到α与壁面平均粗糙高度Δ的对应关系为α=1.29+0.024 8Δ。
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.
[1] 门本, 马强. 隧道粉尘颗粒物的危害及控制措施分析[J]. 交通节能与环保, 2021, 17(1): 144-147. (Men Ben, Ma Qiang. Harm of tunnel dust particles and control measures[J]. Transport Energy Conservation & Environmental Protection, 2021, 17(1): 144-147. (in Chinese))
[2] 王林峰, 冉楗, 钟宜宏, 等. 考虑风筒破损对隧道施工过程中CO排出的影响机制[J]. 科学技术与工程, 2022, 22(24): 10718-10725. (Wang Linfeng, Ran Jian, Zhong Yihong, et al. Considering the lnfluence mechanism of damaged duct on CO emission process during tunnel construction[J]. Science Technology and Engineering, 2022, 22(24): 10718-10725. (in Chinese))
[3] 黄强. 地铁中间风井隧道通风系统布置优化研究[J]. 建筑热能通风空调, 2021, 40(4): 81-84, 91. (Huang Qiang. Optimization design of ventilation saystem in the middle ventilation shaft tunnel of subway[J]. Building Energy & Environment,2021,40(4):81-84, 91. (in Chinese))
[4] 张恒, 孙建春, 向芬, 等. 隧道施工通风壁面粗糙度评定方法及其工程应用[J]. 安全与环境学报, 2019, 19(1): 217-225. (Zhang Heng, Sun Jianchun, Xiang Fen, et al. Assessment method to deal with the wall face roughness in the tunnel construction and its application[J]. Journal of Safety and Environment, 2019, 19(1): 217-225. (in Chinese))
[5] Zhou Y, Yang Y, Bu R W, et al. Effect of press-in ventilation technology on pollutant transport in a railway tunnel under construction[J]. Journal of Cleaner Production, 2020, 243: 118590.
[6] Fang Y, Yao Z G, Lei S. Air flow and gas dispersion in the forced ventilation of a road tunnel during construction[J]. Underground Space, 2019, 4(2): 168-179.
[7] 徐鹏辉, 刘万福, 倪照鹏. 隧道集中排烟道沿程阻力系数模型[J]. 消防科学与技术, 2015, 34(6): 734-739. (Xu Penghui, Liu Wanfu, Ni Zhaopeng. Model test research on friction resistance coefficient for smoke extracting gallery of tunnel[J]. Fire Science and Technology, 2015, 34(6): 734-739. (in Chinese))
[8] 张恒. 复杂网络隧洞群施工通风技术研究[D]. 成都:西南交通大学, 2014. (Zhang Heng. Construction ventilation technology of complex network tunnel group[D].Chengdu: Southwest Jiaotong University, 2014. (in Chinese))
[9] Zhang Z Q, Tan Y J, Zhang H, et al. Experimental and numerical study on the influence of wall roughness on the ventilation resistance coefficient in a tunnel under construction[J]. Tunnelling and Underground Space Technology, 2022, 119: 104198.
[10] Lim H. Experimental study of the influence of roughness area density and surface pattern on near wall flow and surface pressure[J]. Fluid Dynamics Research, IOP Publishing, 2020, 52(5): 055508.
[11] 王亚琼, 张素磊, 夏丰勇, 等. 隧道通风井喷射混凝土壁面沿程阻力系数测试[J]. 长安大学学报(自然科学版), 2015, 35(4): 83-88, 94. (Wang Yaqiong, Zhang Sulei, Xia Fengyong, et al. Test on surface frictional resistant coefficient of ventilation shaft for tunnel[J]. Journal of Chang'an University(Natural Science Edition), 2015, 35(4): 83-88, 94. (in Chinese))
[12] Wang M N, Deng T, Yu L, et al. A uniform air flow distribution design strategy for use in tunnel transverse ventilation systems[J]. Journal of Zhejiang University-Science A, 2019, 20(2): 98-108.
[13] 高峰, 何江, 冉飞, 等. 城市超小半径隧道沿程阻力系数研究[J]. 公路工程, 2022, 47(2): 49-54, 60. (Gao Feng, He Jiang, Ran Fei, et al. Study on drag coefficient of urban ultra-small radius tunnel [J]. Highway Engineering, 2022,47(2):49-54, 60. (in Chinese))
[14] 吴斌, 杨建平, 袁松, 等. 蛇型曲线公路隧道风流分布及沿程阻力特征研究[J]. 隧道建设(中英文), 2021, 41(增2): 123-128. (Wu Bin, Yang Jianping, Yuan Song, et al. Study on characteristics of velocity distribution and resistance loss in serpentine curved road tunnel [J]. Tunnel Construction, 2021,41(Supp.2):123-128. (in Chinese))
