摘要
在隧道施工分隔通风方案设计中,中间隔板末端与工作面距离、风机与工作面距离、风机串联或并联通风是主要考虑因素。采用数值模拟方法,以关角隧道为例,分析了斜井设置中间隔板情况下风机串、并联对应的速度场,比较了串联或并联的通风效果,提出了中间隔板及风机出口与工作面距离建议值。结果表明:斜井长度大于300m时,风机串联通风效果比并联好;斜井长度较小时,并联通风效果比串联好。
The paper is inclined to make a comparison of the ventila- tion effects between parallel-fans operation and that of serial-fans in partition technique in inclined shafts by taking Guanjiao tunnel as a case study sample. As is well known, the distance from the end of middle partition to the working face, or the distance from the fan to the working face should be kept limited, which should be one of the major considerations throughout the tunnel construction design. As for Guanjiao tunnel, we have developed a numerical 3D simulation for analyzing the velocity field by using the software named Flotran142 U- nit of ANSYS. The overall solution procedure we have adopted is based on the SIMPLE algorithm with high Reynolds number x - turbulent flow model and the enhanced wall surface function method. And, then, we have worked out the velocity field of ventilation with fans parallel and series operation and analyzed specifically in the case of middle partition when installed in the slope mines. According to the Technical Regulations for Railway Tunnel （TB 10204--2002.） Construction, the wind velocity of ventilation in the tunnel construc- tion is recommended within 0.15 m/s at full face excavation. The specialized models of counter rotating axial flow fans should be 125B - 2Fl10. In so doing, the distances or lengths of the inclined shafts should be kept in a distance of 300 m, 400 m; 600 m and 800 m. In accordance with the above regulation, Guanjiao Tunnel is rec- ommended to be installed with a fan in every 20 m between the mid- dle partitions and the working face, in addition, no more than 30 m from the outlet to the working face. The results of numerical analysis show that the ventilation effect with the series operation of fans is more advantageous than that of the parallel when the total length of inclined shafts is more than 300 m, though ventilation effect with fans parallel operation could be better than series operation in shorter in- clined mines. Thus, the conclusion made from our comparison can be regarde
出处
《安全与环境学报》
CAS
CSCD
北大核心
2014年第1期78-81,共4页
Journal of Safety and Environment
基金
铁道部科技研究开发计划项目(2007G034)
关键词
桥梁与隧道工程
斜井
分隔通风
风机串联
风机并联
bridge and tunnel engineering
inclined shaft
ventila- tion with middle partition
series fan
parallel fan
