高海拔地区铁路隧道施工期有害气体运移特性

来源期刊:中南大学学报(自然科学版)2016年第11期

论文作者:杨其新 曹正卯 郭春

文章页码:3948 - 3958

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

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: 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-ε unsteady 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.

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