Numerical simulation and experimental study on oxygenation of tunnel face in plateau tunnel construction

IF 6.7 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Feng Lu , Jie Liu , Wanqing Wang , Haowen Zhou , Guanding Yang , Huyun Zhao
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Abstract

In order to investigate the effect of different oxygenation schemes on oxygen enrichment under different working conditions during the construction of the tunnel face of a large section tunnel on a plateau highway and to solve the quantitative problem of the oxygen enrichment model, a full-size numerical model of the tunnel face and a 1:30 experimental model were established for a plateau highway tunnel. These were used for numerical simulation and experimental research. The results indicate that the oxygen enriched area is piled up in the shape of a round bench when a construction bench is present, whereas in the absence of a construction bench, the oxygen enriched area assumes the shape of a slanting droplet. Furthermore, the oxygen enriched programs with oxygen delivery distances of 9 m, 8 m, and 7 m are unable to deliver the oxygen to the tunnel face. In the absence of a construction bench, the oxygenation effect is enhanced when the distance between the oxygen outlet and the tunnel face is 0.5 m. The oxygen released from different locations in multiple ports is distributed along the tunnel’s oxygen distribution range, which extends from three ports to two ports to one port. The number of oxygen ports affects the initial velocity of oxygen, which is susceptible to wind flow field influence. It is challenging to direct the flow of oxygen along the oxygen ports. The oxygen enriched volume of the different oxygen enriched programs in the tunnel under different working conditions can be quantified according to the multivariate linear regression oxygen enriched model, which can serve as a reference for optimizing oxygen enriched programs.
高原隧道施工巷道工作面充氧数值模拟与试验研究
为研究高原公路某大断面隧道开挖工作面不同工况下不同充氧方案对富氧的影响,解决富氧模型的定量化问题,建立了高原公路隧道开挖工作面全尺寸数值模型和1:30试验模型。并将其用于数值模拟和实验研究。结果表明:有施工工作台时,富氧区呈圆形堆积,无施工工作台时,富氧区呈斜滴状堆积。输氧距离为9 m、8 m和7 m的富氧方案无法将氧气输送到巷道工作面。在无施工工作台的情况下,当出氧口与隧洞工作面距离为0.5 m时,充氧效果增强。多个端口不同位置释放的氧气沿隧道的氧气分布范围分布,从三个端口到两个端口再到一个端口。氧口的数量影响氧的初速度,易受风流场的影响。引导氧气沿氧气口流动是一项挑战。根据多元线性回归富氧模型,可以量化不同工况下隧道内不同富氧方案的富氧体积,为优化富氧方案提供参考。
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来源期刊
Tunnelling and Underground Space Technology
Tunnelling and Underground Space Technology 工程技术-工程:土木
CiteScore
11.90
自引率
18.80%
发文量
454
审稿时长
10.8 months
期刊介绍: Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.
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