亭子口灌区瓦斯水工隧洞施工通风影响因素研究  

Study on Multi-factors Affecting Construction Ventilation in Hydraulic Tunnels with Gas in Tingzikou Irrigation Area

作　　者：苏培东[1] 陆星好 李有贵 邱鹏[1] 安兴玲 SU Peidong;LU Xinghao;LI Yougui;QIU Peng;AN Xingling(School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500)

机构地区：[1]西南石油大学地球科学与技术学院,成都610500

出　　处：《现代隧道技术》2024年第4期180-191,共12页Modern Tunnelling Technology

摘　　要：依托亭子口灌区典型瓦斯隧洞工程,基于CFD软件对瓦斯隧洞施工通风效果进行模拟,得到通风流场与瓦斯浓度分布场。通过控制风管出风口与掌子面距离、风管直径、风管出风口风速、离壁距离以及风管布置夹角,研究洞内瓦斯分布规律。结果表明:(1)风管直径与出风口风速的增大均可有效稀释掌子面处聚集的瓦斯,降低洞内瓦斯最高浓度,但若风速过大则对瓦斯的稀释效果提升有限;(2)随着风管出风口与掌子面距离的增加,隧洞内瓦斯最高质量分数先减少后增加,随着风管离壁距离的增加,洞内瓦斯最高质量分数总体呈上升趋势;(3)风管呈75°夹角布置时对瓦斯稀释最有利,风管布置夹角为0°时对瓦斯稀释最不利,风管布置夹角对洞内瓦斯浓度的影响相对最小;(4)考虑多因素复合影响,在本次正交试验因素及水平下,对隧洞通风效果影响最大的是离壁距离,其次为出风口与掌子面的距离,最次为出风口风速。Based on the typical tunnels with gas in the Tingzikou irrigation area,the ventilation effect in tunnels with gas was simulated based on CFD software,obtaining the ventilation flow field and gas concentration distribution field.By controlling the distance between the air pipe outlet and the working face,the diameter of the air pipe,the air velocity at the outlet,the distance from the wall,and the angle of air pipe arrangement,the gas distribution law inside the tunnel was studied.The results show that:(1)Both the increase in the diameter of the air pipe and the air velocity at outlet can effectively dilute the gas accumulated at the working face,reducing the maximum gas concen⁃tration in the tunnel.However,if the air velocity is too high,the improvement in the dilution effect is limited.(2)As the distance between the air pipe outlet and the working face increases,the maximum gas mass fraction in the tunnel decreases first and then increases.As the distance from the wall increases,the maximum gas mass fraction in the tunnel shows an overall upward increase trend.(3)At a 75°angle between the air pipe and the horizontal plane it is most conducive to gas dilution,while a horizontal installation of air pipe is least favorable.The angle of the air pipe arrangement has the relative smallest impact on the gas concentration in the tunnel.(4)Considering the composite influence of multiple factors,under the factors and levels of this orthogonal test,the distance from the wall has the greatest impact on the ventilation effect in the tunnel,followed by the distance between the outlet and the working face,and the least is the air velocity at the outlet.

关 键 词：瓦斯隧洞 数值模拟 通风流场 浓度分布 影响因素 

分 类 号：U459.6[建筑科学—桥梁与隧道工程]