高海拔地区铁路隧道施工期有害气体运移特性
Migration characteristics of poisonous gas during construction stage in railway tunnels at high altitude areas
摘要
Abstract
According to the measured meteorological data of new Guanjiao tunnel project located on Xining—Golmud railway, the migration characteristics and the regularity variation at different altitudes of poisonous gas concentration in railway tunnels during construction stage were simulated and analyzed with FLUENT through the three-dimensional k−εunsteady turbulent model. The results indicate that the influence of air humidity on the deviation of air density calculation results is about 0.3%, which is negligible. The peak concentration of poisonous gas decreases and the volume increases gradually in the dynamic processes of migration to the tunnel entrance, which is in U-shaped distribution in the tunnel. For the impact of environmental atmospheric pressure with the altitude increasing, the concentration of poisonous gas increases exponentially at the same measuring point. The increase in multiples of CO can be calculated by K=eh/104, and more time is required to reach the allowable concentration.关键词
高海拔/铁路隧道/施工通风/有害气体/数值模拟/运移特性Key words
high altitude/railway tunnels/construction ventilation/poisonous gas/numerical simulation/migration characteristics分类
交通工程引用本文复制引用
曹正卯,杨其新,郭春..高海拔地区铁路隧道施工期有害气体运移特性[J].中南大学学报（自然科学版）,2016,47(11):3948-3957,10.基金项目
国家自然科学基金资助项目(51108384,51478393)；中央高校基本科研业务费专项基金资助项目(SWJTU11ZT33,2682014CX062)；教育部创新团队发展计划项目(IRT0955)；中国铁路总公司科技研究开发计划项目(2013T001)；铁道部科技研究开发计划项目(2008G030-C)；重庆市基础与前沿研究计划项目(cstc2015jcyjBX0020)(Projects(51108384,51478393) supported by the National Natural Science Foundation of China （51108384,51478393）
Projects(SWJTU11ZT33,2682014CX062) supported by the Fundamental Research Funds for the Central Universities （SWJTU11ZT33,2682014CX062）
Project(IRT0955) supported by the Program for Innovative Research Team in University of Ministry of Education of China （IRT0955）
Project(2013T001) supported by the Science and Technology Research and Development Program of China Railway Corporation （2013T001）
Project(2008G030-C) supported by the Science and Technology Research and Development Program of Ministry of Railways of China （2008G030-C）
Project(cstc2015jcyjBX0020) supported by the Foundation and Frontier Research Program of Chongqing) （cstc2015jcyjBX0020）
