摘要
文章针对高海拔穿山隧道施工过程中瓦斯扩散运移分布规律和浓度变化特点进行系统分析和全面研究,以宁缠隧道为依托工程,采用数值模拟与现场监测相结合的方法,建立了隧道射流巷道式通风三维模型,分析了高海拔穿山隧道瓦斯流动影响因素、瓦斯运移规律和瓦斯流动分布特点,并利用现场监测数据对模型的可行性进行了验证。结果表明:海拔对隧道内气体的流动有着显著影响,二者呈负相关关系;温度对隧道内的气体流动几乎不产生影响;不同海拔、送风温度下,掌子面处的有害气体浓度变化较小。研究结果可为高海拔穿山隧道施工期瓦斯防护提供参考及借鉴。
This paper systematically analyzes and comprehensively studies the distribution pattern of gas diffusion and migration,and the characteristics of gas concentration changes during the construction of high-altitude mountain tunnels based on the Ningchan tunnel project.It uses the approach of combining numerical simulation and field monitoring to establish a three-dimensional model of jet flow gallery ventilation to analyze the influencing factors of gas flow,gas migration pattern and gas flow distribution characteristics of high-altitude mountain tunnels,and verifies the feasibility of the model by using field monitoring data.The results show that:altitude has a significant impact on the gas flow in the tunnel,and the two are negatively correlated;temperature has a limited effect on the gas flow in the tunnel;the concentration of harmful gases at the tunnel face varies insignificantly under different altitudes and air-supply temperatures.The results of the study can provide reference for gas prevention and protection during the construction of high-altitude mountain tunnels.
作者
李科
王方
程亮
江星宏
LI Ke;WANG Fang;CHENG Liang;JIANG Xinghong(China Merchants Chongqing Communications Technology Researeh&Design Institute Co.,Ltd.,Chongqing 400067;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074)
出处
《现代隧道技术》
CSCD
北大核心
2021年第S01期162-169,共8页
Modern Tunnelling Technology
关键词
穿山隧道
瓦斯运移
瓦斯分布规律
高海拔
Mountain tunnels
Gas migration
Gas distribution pattern
High altitude
