摘要
含瓦斯隧道施工过程中,掌子面为唯一瓦斯涌出源且持续涌出,针对这种瓦斯异常涌出情况,我们以位于重庆市永川区的黄瓜山瓦斯隧道为依托,建立了相关3D物理模型。并运用数值模拟软件Fluent模拟了不同风速下隧道内瓦斯浓度分布情况,以及在同等风速下不同通风时间的隧道内的风流场,进而分析出隧道内瓦斯分布规律:当风速小于6m/s时,风速越大整个隧道内瓦斯浓度越小。当风速为6m/s及以上时,通风稳定后隧道内瓦斯浓度基本保持稳定,隧道内远离风筒的掌子面区域瓦斯浓度为0.25%~0.3%,其余区域瓦斯浓度在0.15%左右,这与现场结果相吻合,对现场瓦斯治理有一定参考价值。
in view of the gas tunnel construction process,the face is the only gas emission source and continues to emit this abnormal gas emission situation,we established the relevant 3D physical model based on the cucumber mountain gas tunnel located in Yongchuan District,Chongqing.And the numerical simulation software Fluent is used to simulate the gas concentration distribution in the tunnel under different wind speeds,and the wind field in the tunnel under the same wind speed and different ventilation time,and then analyze the gas distribution rule in the tunnel:when the wind speed is less than 6m/s,the greater the wind speed,the smaller the gas concentration in the tunnel.When the wind speed is 6 m/s or above,the gas concentration in the tunnel is basically stable after the ventilation is stable,that is,the gas concentration in the tunnel far away from the tunnel face 0.25%~0.3%gas concentration in other areas 0.15%This is consistent with the field results,and has a certain effect on the field gas control.
作者
何毅
徐洪庆
周志顺
高益辉
沈壮志
Yi He;Hongqing Xu;Zhishun Zhou;Yihui Gao;Zhuangzhi Shen(Road and Bridge Engineering Co.,Ltd.of China Railway 16th Bureau Group,Beijing 101500,China)
出处
《青海交通科技》
2020年第6期114-118,共5页
Qinghai Transportation Science and Technology
关键词
低瓦斯隧道
数值模拟
瓦斯浓度
施工安全
low gas tunnel
numerical simulation
gas concentration
construction safety
