高海拔地区铁路隧道施工期有害气体运移特性
发布时间：2018-12-16 15:14
【摘要】：依托西格二线新关角隧道工程,基于关角隧道地区实测气象资料,利用流体计算软件FLUENT,采用三维k-ε湍流非稳态模型,对不同海拔高度地区铁路隧道内施工期有害气体运移特性和质量浓度分布规律进行数值模拟计算分析。研究结果表明:考虑湿度与不考虑湿度对空气密度计算结果影响误差为0.3%左右,可以忽略不计;有害气体在隧道内向洞口运移的动态过程中,最高质量浓度逐渐降低、体积逐渐增大,在隧道内呈U型分布;随着海拔高度增加,由于环境气压的影响,同一测点有害气体质量浓度随海拔高度以指数形式增大,CO增加倍数可按K=eh/104进行计算,且达到容许质量浓度的时间增加。
[Abstract]:Based on the meteorological data measured in Guanjiao tunnel area, the 3D k- 蔚 turbulent unsteady model is used in the fluid calculation software FLUENT, based on the new Guanjiao tunnel project on the second line of Seeger. The characteristics of harmful gas transport and mass concentration distribution in railway tunnels during construction at different altitudes are numerically simulated and analyzed. The results show that the effect error of considering humidity and not considering humidity on air density calculation results is about 0.3%, which can be ignored. During the dynamic movement of harmful gas to the tunnel entrance, the maximum mass concentration decreases gradually, the volume increases gradually, and the gas distribution is U-shaped in the tunnel. With the increase of altitude and the influence of ambient pressure, the mass concentration of harmful gas at the same measuring point increases exponentially with the altitude, and the increase multiple of CO can be calculated by K=eh/104, and the time to reach the allowable mass concentration increases.
【作者单位】： 西南交通大学土木工程学院交通隧道工程教育部重点实验室;招商局重庆交通科研设计院有限公司;
【基金】：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(cstc2015jcyj BX0020)~~
【分类号】：U458
本文编号：2382557
[Abstract]:Based on the meteorological data measured in Guanjiao tunnel area, the 3D k- 蔚 turbulent unsteady model is used in the fluid calculation software FLUENT, based on the new Guanjiao tunnel project on the second line of Seeger. The characteristics of harmful gas transport and mass concentration distribution in railway tunnels during construction at different altitudes are numerically simulated and analyzed. The results show that the effect error of considering humidity and not considering humidity on air density calculation results is about 0.3%, which can be ignored. During the dynamic movement of harmful gas to the tunnel entrance, the maximum mass concentration decreases gradually, the volume increases gradually, and the gas distribution is U-shaped in the tunnel. With the increase of altitude and the influence of ambient pressure, the mass concentration of harmful gas at the same measuring point increases exponentially with the altitude, and the increase multiple of CO can be calculated by K=eh/104, and the time to reach the allowable mass concentration increases.
【作者单位】： 西南交通大学土木工程学院交通隧道工程教育部重点实验室;招商局重庆交通科研设计院有限公司;
【基金】：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(cstc2015jcyj BX0020)~~
【分类号】：U458
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