Surrounding Rock Stresses on a Working Face-End Roof under Mining Influence

The evolution process of the surrounding rock failure mechanism is studied because of spalling and roof fall accidents at the top corner of longwall top coal caving faces affected by mining and the difficulty of moving the advanced end support. Methods are proposed to improve the stability of surrou...

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Autores principales:	Kang Wang, Xinglong Huang, Haibo Li, Feng Zhang, Jiazhen Li, Zhijie Zhu
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/588486aeefae4ab4bf7608232f42267b
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spelling	oai:doaj.org-article:588486aeefae4ab4bf7608232f42267b2021-11-22T01:09:57ZSurrounding Rock Stresses on a Working Face-End Roof under Mining Influence1687-809410.1155/2021/9915008https://doaj.org/article/588486aeefae4ab4bf7608232f42267b2021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/9915008https://doaj.org/toc/1687-8094The evolution process of the surrounding rock failure mechanism is studied because of spalling and roof fall accidents at the top corner of longwall top coal caving faces affected by mining and the difficulty of moving the advanced end support. Methods are proposed to improve the stability of surrounding rocks at the top corner of the end including cutting at the top corner of the end, reinforcing the anchor cable, changing the stress distribution of surrounding rocks at the top corner of the end, and transferring the stress concentration area of surrounding rocks to the deeper rock. Field observations of the surrounding rocks at the top corner of the 15107 fully mechanized caving face show that the stress value of the surrounding rocks at the corner between the roof of the return airway and the coal wall of the working face is 28.9 MPa when the surrounding rocks are in a stable state without mining. The stress value of surrounding rocks at the top corner of the end is 32.3 MPa when it is affected by mining, which results in spalling and roof fall. The surrounding rocks are in a stable state when the maximum stress of the surrounding rocks at the top corner of the reinforced anchor cable’s back-end is 26.1 MPa. The results show that cutting of the surrounding rocks at the top corner of the end and the reinforcement of the anchor cable can avoid the spalling and roof fall when the top corner of the end is affected by mining and can ensure that the end support advances and working face moves forward.Kang WangXinglong HuangHaibo LiFeng ZhangJiazhen LiZhijie ZhuHindawi LimitedarticleEngineering (General). Civil engineering (General)TA1-2040ENAdvances in Civil Engineering, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Engineering (General). Civil engineering (General) TA1-2040 Kang Wang Xinglong Huang Haibo Li Feng Zhang Jiazhen Li Zhijie Zhu Surrounding Rock Stresses on a Working Face-End Roof under Mining Influence
description	The evolution process of the surrounding rock failure mechanism is studied because of spalling and roof fall accidents at the top corner of longwall top coal caving faces affected by mining and the difficulty of moving the advanced end support. Methods are proposed to improve the stability of surrounding rocks at the top corner of the end including cutting at the top corner of the end, reinforcing the anchor cable, changing the stress distribution of surrounding rocks at the top corner of the end, and transferring the stress concentration area of surrounding rocks to the deeper rock. Field observations of the surrounding rocks at the top corner of the 15107 fully mechanized caving face show that the stress value of the surrounding rocks at the corner between the roof of the return airway and the coal wall of the working face is 28.9 MPa when the surrounding rocks are in a stable state without mining. The stress value of surrounding rocks at the top corner of the end is 32.3 MPa when it is affected by mining, which results in spalling and roof fall. The surrounding rocks are in a stable state when the maximum stress of the surrounding rocks at the top corner of the reinforced anchor cable’s back-end is 26.1 MPa. The results show that cutting of the surrounding rocks at the top corner of the end and the reinforcement of the anchor cable can avoid the spalling and roof fall when the top corner of the end is affected by mining and can ensure that the end support advances and working face moves forward.
format	article
author	Kang Wang Xinglong Huang Haibo Li Feng Zhang Jiazhen Li Zhijie Zhu
author_facet	Kang Wang Xinglong Huang Haibo Li Feng Zhang Jiazhen Li Zhijie Zhu
author_sort	Kang Wang
title	Surrounding Rock Stresses on a Working Face-End Roof under Mining Influence
title_short	Surrounding Rock Stresses on a Working Face-End Roof under Mining Influence
title_full	Surrounding Rock Stresses on a Working Face-End Roof under Mining Influence
title_fullStr	Surrounding Rock Stresses on a Working Face-End Roof under Mining Influence
title_full_unstemmed	Surrounding Rock Stresses on a Working Face-End Roof under Mining Influence
title_sort	surrounding rock stresses on a working face-end roof under mining influence
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/588486aeefae4ab4bf7608232f42267b
work_keys_str_mv	AT kangwang surroundingrockstressesonaworkingfaceendroofundermininginfluence AT xinglonghuang surroundingrockstressesonaworkingfaceendroofundermininginfluence AT haiboli surroundingrockstressesonaworkingfaceendroofundermininginfluence AT fengzhang surroundingrockstressesonaworkingfaceendroofundermininginfluence AT jiazhenli surroundingrockstressesonaworkingfaceendroofundermininginfluence AT zhijiezhu surroundingrockstressesonaworkingfaceendroofundermininginfluence
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Surrounding Rock Stresses on a Working Face-End Roof under Mining Influence

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