Main Roof Breakage and Vibration Induced Coal Burst Occurring in Longwall Roadways

Rock burst is one major threat to mining safety and economy. Rock burst occurring in the longwall mining roadway accounts for 85% of the total amount of burst events. This paper investigates the causality mechanism of rock burst in longwall roadways by establishing a finite elastic beam model in the...

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Autores principales:	Shuangwen Ma, Chen Cao, Qianjia Hui
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/43fdbfb1d50a4631a8f17d203e88f933
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id	oai:doaj.org-article:43fdbfb1d50a4631a8f17d203e88f933
record_format	dspace
spelling	oai:doaj.org-article:43fdbfb1d50a4631a8f17d203e88f9332021-11-08T02:37:04ZMain Roof Breakage and Vibration Induced Coal Burst Occurring in Longwall Roadways1875-920310.1155/2021/4982522https://doaj.org/article/43fdbfb1d50a4631a8f17d203e88f9332021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/4982522https://doaj.org/toc/1875-9203Rock burst is one major threat to mining safety and economy. Rock burst occurring in the longwall mining roadway accounts for 85% of the total amount of burst events. This paper investigates the causality mechanism of rock burst in longwall roadways by establishing a finite elastic beam model in the working face based on the elastic foundation theory. The breakage process of the main roof and related dynamic effects are analysed. The result shows that the movement of the main roof shows free vibration under certain damping resistance. It is also found that the roof dominant vibration frequency increases with the increase in the thickness and elastic modulus of the roof. During roof vibration, the vertical stress applied on the coal mass is unloaded. The destressing of the roof-coal interface causes the coal mass in the roadway rib to slip into the roadway under the horizontal ground stress, resulting in rock burst. The possibility of rock burst increases with increase in the strength and thickness of the roof and horizontal ground stress within the coal mass. This mechanism explains the occurrence of rock burst in the mining roadway; it provides the fundamental theory for the prevention and controlling technologies of longwall roadway rock burst.Shuangwen MaChen CaoQianjia HuiHindawi LimitedarticlePhysicsQC1-999ENShock and Vibration, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Shuangwen Ma Chen Cao Qianjia Hui Main Roof Breakage and Vibration Induced Coal Burst Occurring in Longwall Roadways
description	Rock burst is one major threat to mining safety and economy. Rock burst occurring in the longwall mining roadway accounts for 85% of the total amount of burst events. This paper investigates the causality mechanism of rock burst in longwall roadways by establishing a finite elastic beam model in the working face based on the elastic foundation theory. The breakage process of the main roof and related dynamic effects are analysed. The result shows that the movement of the main roof shows free vibration under certain damping resistance. It is also found that the roof dominant vibration frequency increases with the increase in the thickness and elastic modulus of the roof. During roof vibration, the vertical stress applied on the coal mass is unloaded. The destressing of the roof-coal interface causes the coal mass in the roadway rib to slip into the roadway under the horizontal ground stress, resulting in rock burst. The possibility of rock burst increases with increase in the strength and thickness of the roof and horizontal ground stress within the coal mass. This mechanism explains the occurrence of rock burst in the mining roadway; it provides the fundamental theory for the prevention and controlling technologies of longwall roadway rock burst.
format	article
author	Shuangwen Ma Chen Cao Qianjia Hui
author_facet	Shuangwen Ma Chen Cao Qianjia Hui
author_sort	Shuangwen Ma
title	Main Roof Breakage and Vibration Induced Coal Burst Occurring in Longwall Roadways
title_short	Main Roof Breakage and Vibration Induced Coal Burst Occurring in Longwall Roadways
title_full	Main Roof Breakage and Vibration Induced Coal Burst Occurring in Longwall Roadways
title_fullStr	Main Roof Breakage and Vibration Induced Coal Burst Occurring in Longwall Roadways
title_full_unstemmed	Main Roof Breakage and Vibration Induced Coal Burst Occurring in Longwall Roadways
title_sort	main roof breakage and vibration induced coal burst occurring in longwall roadways
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/43fdbfb1d50a4631a8f17d203e88f933
work_keys_str_mv	AT shuangwenma mainroofbreakageandvibrationinducedcoalburstoccurringinlongwallroadways AT chencao mainroofbreakageandvibrationinducedcoalburstoccurringinlongwallroadways AT qianjiahui mainroofbreakageandvibrationinducedcoalburstoccurringinlongwallroadways
_version_	1718442994306121728

Main Roof Breakage and Vibration Induced Coal Burst Occurring in Longwall Roadways

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