Study of Gob-Side Entry Retaining Technology with Roof Cutting under Upper Roadway Condition

Gob-side entry retaining technology with roof cutting (GERRC) has been widely used in flat and near-flat coal seam conditions, but its application under inclined coal seam is still very deficient. In order to further improve the application system of GERRC and overcome the application difficulties u...

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Autores principales:	Xingen Ma, Manchao He, Xuewei Sun, Jianfeng Li, Gang He, Enze Zhen
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/5ba50b85a62143489e42f6fba18c69b3
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spelling	oai:doaj.org-article:5ba50b85a62143489e42f6fba18c69b32021-11-29T00:56:02ZStudy of Gob-Side Entry Retaining Technology with Roof Cutting under Upper Roadway Condition1875-920310.1155/2021/7624166https://doaj.org/article/5ba50b85a62143489e42f6fba18c69b32021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/7624166https://doaj.org/toc/1875-9203Gob-side entry retaining technology with roof cutting (GERRC) has been widely used in flat and near-flat coal seam conditions, but its application under inclined coal seam is still very deficient. In order to further improve the application system of GERRC and overcome the application difficulties under special geological conditions, this paper takes the 43073 working face of Yixin coal mine as an example to research the GERRC with upper roadway under gently inclined thick coal seam. Firstly, the difficulties in the upper entry retaining with inclined coal seam are analyzed and the corresponding key technologies and system designs are put forward. Subsequently, the roof cutting and upper entry retaining are designed in detail according to geological conditions of test working face, and the roof cutting and pressure releasing effect is analyzed by numerical simulation to expound the stress distribution and pressure releasing mechanism of surrounding rock. Finally, the upper entry retaining field test is carried out to verify the feasibility and applicability of the technology and related designs. Through field monitoring, it is found that the weighting step increases significantly, the weighting strength decreases effectively on the roof cutting side, and the pressure relief effect is obvious. Meanwhile, the maximum roof to floor convergence is 361 mm and the maximum shrinkage of both sides is 280 mm, so the retained entry can meet the reuse requirement of adjacent working face.Xingen MaManchao HeXuewei SunJianfeng LiGang HeEnze ZhenHindawi LimitedarticlePhysicsQC1-999ENShock and Vibration, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Xingen Ma Manchao He Xuewei Sun Jianfeng Li Gang He Enze Zhen Study of Gob-Side Entry Retaining Technology with Roof Cutting under Upper Roadway Condition
description	Gob-side entry retaining technology with roof cutting (GERRC) has been widely used in flat and near-flat coal seam conditions, but its application under inclined coal seam is still very deficient. In order to further improve the application system of GERRC and overcome the application difficulties under special geological conditions, this paper takes the 43073 working face of Yixin coal mine as an example to research the GERRC with upper roadway under gently inclined thick coal seam. Firstly, the difficulties in the upper entry retaining with inclined coal seam are analyzed and the corresponding key technologies and system designs are put forward. Subsequently, the roof cutting and upper entry retaining are designed in detail according to geological conditions of test working face, and the roof cutting and pressure releasing effect is analyzed by numerical simulation to expound the stress distribution and pressure releasing mechanism of surrounding rock. Finally, the upper entry retaining field test is carried out to verify the feasibility and applicability of the technology and related designs. Through field monitoring, it is found that the weighting step increases significantly, the weighting strength decreases effectively on the roof cutting side, and the pressure relief effect is obvious. Meanwhile, the maximum roof to floor convergence is 361 mm and the maximum shrinkage of both sides is 280 mm, so the retained entry can meet the reuse requirement of adjacent working face.
format	article
author	Xingen Ma Manchao He Xuewei Sun Jianfeng Li Gang He Enze Zhen
author_facet	Xingen Ma Manchao He Xuewei Sun Jianfeng Li Gang He Enze Zhen
author_sort	Xingen Ma
title	Study of Gob-Side Entry Retaining Technology with Roof Cutting under Upper Roadway Condition
title_short	Study of Gob-Side Entry Retaining Technology with Roof Cutting under Upper Roadway Condition
title_full	Study of Gob-Side Entry Retaining Technology with Roof Cutting under Upper Roadway Condition
title_fullStr	Study of Gob-Side Entry Retaining Technology with Roof Cutting under Upper Roadway Condition
title_full_unstemmed	Study of Gob-Side Entry Retaining Technology with Roof Cutting under Upper Roadway Condition
title_sort	study of gob-side entry retaining technology with roof cutting under upper roadway condition
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/5ba50b85a62143489e42f6fba18c69b3
work_keys_str_mv	AT xingenma studyofgobsideentryretainingtechnologywithroofcuttingunderupperroadwaycondition AT manchaohe studyofgobsideentryretainingtechnologywithroofcuttingunderupperroadwaycondition AT xueweisun studyofgobsideentryretainingtechnologywithroofcuttingunderupperroadwaycondition AT jianfengli studyofgobsideentryretainingtechnologywithroofcuttingunderupperroadwaycondition AT ganghe studyofgobsideentryretainingtechnologywithroofcuttingunderupperroadwaycondition AT enzezhen studyofgobsideentryretainingtechnologywithroofcuttingunderupperroadwaycondition
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Study of Gob-Side Entry Retaining Technology with Roof Cutting under Upper Roadway Condition

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