特长高瓦斯隧道双斜井辅助正洞施工通风的数值分析  

Numerical Analysis of Air Ventilation Fraction of Auxiliary Main Tunnel Construction With Double Inclined Shafts in Extra Long High Gas Tunnel

作　　者：石广斌[1] 来显杰 洪勇 张雯[1] 刘江 SHI Guangbin;LAI Xianjie;HONG Yong;ZHANG Wen;LIU Jiang(School of Resources Engineering,Xi an University of Architecture and Technology,Xi’an 710055,China;Guizhou Highway Engineering Group Co.,Ltd.,Guiyang 550008,China)

机构地区：[1]西安建筑科技大学资源工程学院,陕西西安710055 [2]贵州省公路工程集团有限公司,贵州贵阳550008

出　　处：《矿业工程研究》2022年第2期55-61,共7页Mineral Engineering Research

基　　金：国家自然科学基金项目青年基金资助项目(51904220);陕西省教育厅基金资助项目(21JK0719)。

摘　　要：为研究特长高瓦斯隧道利用双斜井辅助正洞通风的问题,以贵州在建桐梓隧道为例,计算其需风量和选择风机型号,采用数值分析的方法研究了巷道式通风下隧道内风流场变化和瓦斯运移规律.结果表明,该通风方式隧道内瓦斯最高浓度为0.25%,降低了86%,正洞回风平均风速可达0.5 m/s以上,排风道风速均在0.75 m/s以上;射流区一侧瓦斯浓度沿隧道轴向呈“急速下降-逐渐稳定”的趋势,回流区一侧瓦斯浓度沿隧道轴向呈“急速下降-缓慢上升-逐渐稳定”的趋势;掌子面瓦斯浓度随时间呈“急速下降-缓慢上升-逐渐稳定”的趋势;轴向风速在掌子面附近会发生较大波动,瓦斯浓度在距离掌子面2 m的位置达到最小.In order to study the problem in using double inclined shaft to assist the main tunnel ventilation in extra long high gas tunnel,taking the construction ventilation of Tongzi tunnel gas work area under construction in Guizhou as the example,the air demand of tunnel roadway construction ventilation is calculated theoretically and the model of axial flow fan is selected.The change of air flow field and gas migration law in the tunnel are studied by FLUENT software and field monitoring method.Results show that the maximum gas concentration in the tunnel is 0.25%,which is reduced by 86%.The average wind speed of return air in the main tunnel is more than 0.5 m/s,and the wind speed of exhaust duct is more than 0.75 m/s.The gas concentration at one side of the jet area shows a“rapid decline-gradually stable”trend along the tunnel axis,and the gas concentration at one side of the reflux area shows a“rapid decline-slowly rise-gradually stable”trend along the tunnel axis.The gas concentration in the tunnel face shows a trend of“rapid decline-slow rise-gradual stability”with time.The axial wind speed will fluctuate greatly near the tunnel face,and the gas concentration will reach the minimum at 2 m away from the tunnel face.

关 键 词：特长隧道 瓦斯隧道 施工通风 双斜井 数值模拟 瓦斯运移 

分 类 号：U453.5[建筑科学—桥梁与隧道工程] TD721[交通运输工程—道路与铁道工程]