铁路隧道压入式通风流场分析及施工参数优化

Analysis of Forced Ventilation Flow Field in Railway Tunnel and Optimization of Construction Parameters

台阶法具有适应性强、应用较广泛等的优势,但鉴于台阶法施工隧道有限空间结构的特殊性,对台阶法施工铁路隧道压入式通风流场进行研究分析,并对隧道通风施工参数进行优化。依托兴泉铁路某隧道,采用流体力学分析软件FLUENT,针对台阶法施工隧道压入式通风风管位置、风管出风口距工作面距离、台阶长度及台阶高度等因素对流场的影响进行数值模拟,分析不同工况下的流场特征并进行相应参数优化。结果表明:隧道通风在台阶法施工隧道中是有限空间的受限贴附射流,并且风管侧部布置更有利于空气流通,同时发现台阶的存在在一定程度上不利于洞内空气的流通,风管出风口距工作面的距离、台阶长度和台阶高度之间存在优化组合。

The bench cut method has the advantages of strong adaptability and wide application.However,in view of the particula-rity of the limited space structure of tunnel constructed by the bench cut method,the forced air flow field of railway tunnel constructed by the bench cut method was researched and analyzed,and the tunnel ventilation construction parameters were optimized.Based on a tunnel in Xingquan Railway,the fluid mechanics analysis software FLUENT was used to conduct numerical simulation on the influence of such factors as the position of the forced ventilation duct,the distance between the air outlet of the duct and the working face,the length of the step and the height of the step,etc..It was used to analyze the flow field characteristics under different working conditions and optimize the corresponding parameters.Results show that the tunnel ventilation is a confined attached jet with limited space in the tunnel constructed by the bench cut method,and duct lateral arrangement is more advantageous to the air circulation.It is also found that the existence of the steps in certain extent is not conducive to the circulation of air in the hole and there is an optimal combination between the distance from air duct to the working surface,the step length and the step height.