高寒地区特长隧道隔板与风管联合式通风模拟研究  

Simulation Study on Combined Clapboard and Air Channel Ventilation for Extra-long Tunnels in Arctic-Alpine Regions

作　　者：吕晓云 梁庆国[1] 周仁 刘屈瑶 曹生慧 吴晓辉 LYU Xiaoyun;LIANG Qingguo;ZHOU Ren;LIU Quyao;CAO Shenghui;WU Xiaohui(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;China Railway No.2 Engineering Group Co.,Ltd.,Chengdu 610031,China;Lanzhou-Xinjiang Railway Gan-Qing Co.,Ltd.,Lanzhou 730000,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]中铁二局集团有限公司,四川成都610031 [3]兰新铁路甘青有限公司,甘肃兰州730000

出　　处：《铁道学报》2024年第6期181-188,共8页Journal of the China Railway Society

基　　金：国家自然科学基金(51968041);中国博士后科学基金(2021M693843);兰州交通大学“百名青年优秀人才培养计划”。

摘　　要：为研究隔板通风在高寒地区特长隧道中的通风效果,以甘青隧道工程为依托,采用数值模拟与理论计算分析方法,将风仓长度、风机位置和中隔板长度作为变量,研究不同风仓参数对通风效率的影响;基于最优风仓参数,进一步通过模拟计算得到风管出口最佳位置。结果表明:在保证掌子面正常供风的前提下,当风仓长度为30 m、风机位于风仓中间位置、中隔板长度为6 m时,风仓内流场分布较稳定,受涡流影响较小,通风效果最佳。对比掌子面和风管出口不同距离时的速度云图以及风速变化曲线得出,当风管出口与掌子面距离过近时,射流不能充分发展,与掌子面距离过远时,由于射流风与隧道内空气不断发生动能传递作用,射流风动能损失过大,射流无法触及掌子面,因此最优风管出口位置布设距离为25 m。研究结论可为类似工程提供参考。In order to study the effect of clapboard ventilation for extra-long tunnels in arctic-alpine regions,based on the Ganqing tunnel project,numerical simulation and theoretical calculation methods were adopted to study the influence of different air cabin parameters on the ventilation efficiency,with the length of the air cabin,fan position and the length of the middle baffle as variables.Under the condition of the optimal parameters of air cabin,further simulation calculations were conducted to obtain the optimal position of air channel outlet.The results show that under the precondition of ensuring normal air supply to the heading face,under 30 m length of the air cabin,the location of the fan in the middle of the air cabin,and 6 m length of the middle baffle,the flow field distribution in the air cabin is stable,less affected by the vortex,with best ventilation effect.Comparing the velocity contour and wind speed variation curves at different distances between the face and the air channel outlet,the jet cannot fully develop in the case of close distance between the air channel outlet and the face.In the case of far distance between the air channel outlet and the face,due to continuous dynamic energy transfer between the jet wind and the air in the tunnel,excessive dynamic energy of the jet wind is lost,resulting in the failure of the jet to reach the face.Therefore,the optimal distance for arranging the outlet location of the air channel is 25 m.It can provide reference for similar projects.

关 键 词：特长隧道 数值模拟 风仓参数 风管出口位置 

分 类 号：U453.5[建筑科学—桥梁与隧道工程]