Surrounding Rock Control Technology When the Longwall Face Crosses Abandoned Roadways: A Case Study

When a working face is crossing the abandoned roadways, problems such as roof subsidence, rock fracture, and instability will occur, resulting in widespread roof fall and rib spalling, which seriously affect safe and efficient mining on the working face. In this paper, the no. 23 coal pillar working...

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Autores principales:	Zhenpeng Jiang, Fangtian Wang, Kaijun Miao, Qinghua Cao
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi-Wiley 2021
Materias:	Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/886bbe41e3ee4498945a4f9cfec517d3
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id	oai:doaj.org-article:886bbe41e3ee4498945a4f9cfec517d3
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spelling	oai:doaj.org-article:886bbe41e3ee4498945a4f9cfec517d32021-11-29T00:56:48ZSurrounding Rock Control Technology When the Longwall Face Crosses Abandoned Roadways: A Case Study1468-812310.1155/2021/7867460https://doaj.org/article/886bbe41e3ee4498945a4f9cfec517d32021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/7867460https://doaj.org/toc/1468-8123When a working face is crossing the abandoned roadways, problems such as roof subsidence, rock fracture, and instability will occur, resulting in widespread roof fall and rib spalling, which seriously affect safe and efficient mining on the working face. In this paper, the no. 23 coal pillar working face of Juji coal mine is taken as the engineering background, a mechanical model of crossing the abandoned roadways is constructed aimed at the problem of the working face crossing the abandoned roadway group, the collapse of the abandoned roadway roof is analyzed, a scheme of crossing the abandoned roadways is designed, and the development law of the stress and plastic zone after the reinforcement scheme is stimulated and analyzed. The results show that when the working face advances to the abandoned roadway, key block B crosses the abandoned roadway and the solid coal to form a “cross-roadway long key block.” It is calculated that the minimum support resistance required for the abandoned roadway is 6700 kN. Based on the results of numerical comparison, it is concluded that filling wood pile when the working face passes through the roof abandoned roadway and adding anchor cables for reinforcement support when the working face crosses the coal seam abandoned roadway effectively reduce the stress concentration of surrounding rocks, decrease the development of the plastic zone, and achieve safe and efficient mining when the working face crosses the abandoned roadways.Zhenpeng JiangFangtian WangKaijun MiaoQinghua CaoHindawi-WileyarticleGeologyQE1-996.5ENGeofluids, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Geology QE1-996.5
spellingShingle	Geology QE1-996.5 Zhenpeng Jiang Fangtian Wang Kaijun Miao Qinghua Cao Surrounding Rock Control Technology When the Longwall Face Crosses Abandoned Roadways: A Case Study
description	When a working face is crossing the abandoned roadways, problems such as roof subsidence, rock fracture, and instability will occur, resulting in widespread roof fall and rib spalling, which seriously affect safe and efficient mining on the working face. In this paper, the no. 23 coal pillar working face of Juji coal mine is taken as the engineering background, a mechanical model of crossing the abandoned roadways is constructed aimed at the problem of the working face crossing the abandoned roadway group, the collapse of the abandoned roadway roof is analyzed, a scheme of crossing the abandoned roadways is designed, and the development law of the stress and plastic zone after the reinforcement scheme is stimulated and analyzed. The results show that when the working face advances to the abandoned roadway, key block B crosses the abandoned roadway and the solid coal to form a “cross-roadway long key block.” It is calculated that the minimum support resistance required for the abandoned roadway is 6700 kN. Based on the results of numerical comparison, it is concluded that filling wood pile when the working face passes through the roof abandoned roadway and adding anchor cables for reinforcement support when the working face crosses the coal seam abandoned roadway effectively reduce the stress concentration of surrounding rocks, decrease the development of the plastic zone, and achieve safe and efficient mining when the working face crosses the abandoned roadways.
format	article
author	Zhenpeng Jiang Fangtian Wang Kaijun Miao Qinghua Cao
author_facet	Zhenpeng Jiang Fangtian Wang Kaijun Miao Qinghua Cao
author_sort	Zhenpeng Jiang
title	Surrounding Rock Control Technology When the Longwall Face Crosses Abandoned Roadways: A Case Study
title_short	Surrounding Rock Control Technology When the Longwall Face Crosses Abandoned Roadways: A Case Study
title_full	Surrounding Rock Control Technology When the Longwall Face Crosses Abandoned Roadways: A Case Study
title_fullStr	Surrounding Rock Control Technology When the Longwall Face Crosses Abandoned Roadways: A Case Study
title_full_unstemmed	Surrounding Rock Control Technology When the Longwall Face Crosses Abandoned Roadways: A Case Study
title_sort	surrounding rock control technology when the longwall face crosses abandoned roadways: a case study
publisher	Hindawi-Wiley
publishDate	2021
url	https://doaj.org/article/886bbe41e3ee4498945a4f9cfec517d3
work_keys_str_mv	AT zhenpengjiang surroundingrockcontroltechnologywhenthelongwallfacecrossesabandonedroadwaysacasestudy AT fangtianwang surroundingrockcontroltechnologywhenthelongwallfacecrossesabandonedroadwaysacasestudy AT kaijunmiao surroundingrockcontroltechnologywhenthelongwallfacecrossesabandonedroadwaysacasestudy AT qinghuacao surroundingrockcontroltechnologywhenthelongwallfacecrossesabandonedroadwaysacasestudy
_version_	1718407656764342272

Surrounding Rock Control Technology When the Longwall Face Crosses Abandoned Roadways: A Case Study

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