高原铁路钻爆法隧道断面优化研究

Study on Cross Section Optimization in Plateau Railway Tunnels Constructed by Drill and Blast Method

对高原铁路钻爆法隧道断面影响因素进行分析,并重点从气动效应、接触网悬挂及轨下结构布置三个影响因素开展断面优化研究。研究结果表明,从气动效应方面高海拔地区隧道断面具有优化的空间,接触网悬挂类型及悬挂高度对隧道断面的高度影响大,沟槽布置主要影响隧道断面宽度方向。结合不同的海拔跨度,提出了以海拔为分级依据的隧道断面优化方案。

In this paper,the factors affecting the cross section of the plateau railway tunnel constructed by drill and blast method are analyzed,and emphasis is laid on tunnel cross section optimization from three influencing factors:aerodynamic effect,OCS suspension and underrail structure layout.Analysis and research show that there is room for optimization of tunnel cross section at high-altitude areas in terms of aerodynamic effects.The suspension type and the suspension height of OCS have a significant impact on the height of the tunnel cross section,while the layout of grooves mainly affects the width direction of the tunnel cross section.By combining with different altitude spans,an optimization plan for tunnel cross section is proposed based on altitude classification,and the research results can provide reference for the design of cross sections in similar high-altitude railway tunnel projects.