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Experimental study on the influence of longitudinal slope on airflow-dust migration behavior after tunnel blasting

In this paper, a 1:21 model experiment was conducted to discuss the dust diffusion efficiency and liner trolley obstruction effect inside the tunnel at − 9% to 9%, the effect of different initial dust concentrations on dust diffusion and liner trolley obstruction effect at 6% slope, and the effect o...

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Autores principales: Hu, Hui, Tao, Yuchun, Zhang, Heng, Zhao, Yiqi, Lan, Youdi, Ge, Zhenghui
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10643652/
https://www.ncbi.nlm.nih.gov/pubmed/37957179
http://dx.doi.org/10.1038/s41598-023-46242-5
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author Hu, Hui
Tao, Yuchun
Zhang, Heng
Zhao, Yiqi
Lan, Youdi
Ge, Zhenghui
author_facet Hu, Hui
Tao, Yuchun
Zhang, Heng
Zhao, Yiqi
Lan, Youdi
Ge, Zhenghui
author_sort Hu, Hui
collection PubMed
description In this paper, a 1:21 model experiment was conducted to discuss the dust diffusion efficiency and liner trolley obstruction effect inside the tunnel at − 9% to 9%, the effect of different initial dust concentrations on dust diffusion and liner trolley obstruction effect at 6% slope, and the effect of different return air velocity on dust diffusion at 6% slope, the reliability of the results is verified by computational fluid dynamics simulations. The results show that as the slope of the tunnel changes from 0 to − 9%, the average dust diffusion time decreases by 3.7% at the working face and the dust concentration difference between the front and rear of the trolley is improved by 2.7%. When the slope of the tunnel changes from 0 to − 9%, the average dust diffusion time increases by 7.2% at the working face and the dust concentration difference between the front and rear of the trolley is improved by 17.9%. With each 100 mg/m(3) increase in the initial dust concentration, the dust diffusion time at the working face and the tunnel exit increases by 9.15% and 8.17% on average, and the lining trolley obstruction time increases by 23.33 s on average. The dust diffusion times take an average reduction rate of 15.7%, with the increase of return air velocity. The recommended return air velocity is greater than 1 m/s for large slope tunnels. When the slope changes from 0° to 9°, the hindrance rate of slope on dust diffusion is 2.88462%, 8.65385%, and 16.34615% respectively. Dust diffusion efficiency will be reduced as the tunnel slope changes from 0° to 9°, The growth rate of slope on dust diffusion is − 0.96154%, − 2.88462%, and − 6.73077% respectively.
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spelling pubmed-106436522023-11-13 Experimental study on the influence of longitudinal slope on airflow-dust migration behavior after tunnel blasting Hu, Hui Tao, Yuchun Zhang, Heng Zhao, Yiqi Lan, Youdi Ge, Zhenghui Sci Rep Article In this paper, a 1:21 model experiment was conducted to discuss the dust diffusion efficiency and liner trolley obstruction effect inside the tunnel at − 9% to 9%, the effect of different initial dust concentrations on dust diffusion and liner trolley obstruction effect at 6% slope, and the effect of different return air velocity on dust diffusion at 6% slope, the reliability of the results is verified by computational fluid dynamics simulations. The results show that as the slope of the tunnel changes from 0 to − 9%, the average dust diffusion time decreases by 3.7% at the working face and the dust concentration difference between the front and rear of the trolley is improved by 2.7%. When the slope of the tunnel changes from 0 to − 9%, the average dust diffusion time increases by 7.2% at the working face and the dust concentration difference between the front and rear of the trolley is improved by 17.9%. With each 100 mg/m(3) increase in the initial dust concentration, the dust diffusion time at the working face and the tunnel exit increases by 9.15% and 8.17% on average, and the lining trolley obstruction time increases by 23.33 s on average. The dust diffusion times take an average reduction rate of 15.7%, with the increase of return air velocity. The recommended return air velocity is greater than 1 m/s for large slope tunnels. When the slope changes from 0° to 9°, the hindrance rate of slope on dust diffusion is 2.88462%, 8.65385%, and 16.34615% respectively. Dust diffusion efficiency will be reduced as the tunnel slope changes from 0° to 9°, The growth rate of slope on dust diffusion is − 0.96154%, − 2.88462%, and − 6.73077% respectively. Nature Publishing Group UK 2023-11-13 /pmc/articles/PMC10643652/ /pubmed/37957179 http://dx.doi.org/10.1038/s41598-023-46242-5 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Hu, Hui
Tao, Yuchun
Zhang, Heng
Zhao, Yiqi
Lan, Youdi
Ge, Zhenghui
Experimental study on the influence of longitudinal slope on airflow-dust migration behavior after tunnel blasting
title Experimental study on the influence of longitudinal slope on airflow-dust migration behavior after tunnel blasting
title_full Experimental study on the influence of longitudinal slope on airflow-dust migration behavior after tunnel blasting
title_fullStr Experimental study on the influence of longitudinal slope on airflow-dust migration behavior after tunnel blasting
title_full_unstemmed Experimental study on the influence of longitudinal slope on airflow-dust migration behavior after tunnel blasting
title_short Experimental study on the influence of longitudinal slope on airflow-dust migration behavior after tunnel blasting
title_sort experimental study on the influence of longitudinal slope on airflow-dust migration behavior after tunnel blasting
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10643652/
https://www.ncbi.nlm.nih.gov/pubmed/37957179
http://dx.doi.org/10.1038/s41598-023-46242-5
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