Study on pressure relief mechanism of hydraulic support in working face under directional roof crack

Zhang, Jun; Liu, Jianning; Wang, Yajun; Yang, Gang; Hou, Shilin; Wang, Yuanjun; He, Manchao; Yang, Jun

doi:10.24425/ams.2023.144320

Artykuł - szczegóły

Tytuł artykułu

Study on pressure relief mechanism of hydraulic support in working face under directional roof crack

Autorzy

Zhang Jun , Liu Jianning , Wang Yajun , Yang Gang , Hou Shilin , Wang Yuanjun , He Manchao , Yang Jun

Treść / Zawartość

Pełne teksty:

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Identyfikatory

DOI

10.24425/ams.2023.144320

Warianty tytułu

Języki publikacji

Abstrakty

When mining coal from the working face, the main roof withstands the overlying strata. The main roof’s first weighting and periodic weighting may cause accidents, such as crushing the working face hydraulic supports. A mechanical model of the main roof was constructed, and the contributing factors of first and periodic weights on the main roof were examined in order to prevent such accidents. The thickness of the main roof was found as the most contributory factor to the main roof’s stability. Therefore, a new directional roof crack (DRC) technique is proposed, which produces directional cracks in the main roof through directional blasting and makes part of it collapse in advance so as to reduce the thickness and relieve the first and periodic weighting. To verify the effectiveness of DRC, the mechanism of DRC was analysed. A mechanical model of the hydraulic support was constructed, and the DRC techniques were tested on-site. Field experiments with a complete set of monitoring schemes showed that, with DRC technology, the roof periodic weighting interval decreased by 35.36%, and the hydraulic support pressure decreased by 17.56%. The theoretical analysis was consistent with the measured results. Therefore, the DRC technology is feasible and effective to ensure mining safety at the working face.

Słowa kluczowe

directional roof crack pressure relief mechanism main roof hydraulic support pressure

ciśnienie hydrauliczne wydobycie węgla podpora hydrauliczna

Wydawca

Instytut Mechaniki Górotworu PAN

Czasopismo

Archives of Mining Sciences

Rocznik

2023

Tom

Vol. 68, no. 1

Strony

103--123

Opis fizyczny

Bibliogr. 44 poz., fot., rys., tab., wykr.

Twórcy

autor

Zhang Jun

China University of Mining & Technology (Beijing), State Key Laboratory for Geomechanics and Deep Underground Engineering, Beijing 100083, China

https://orcid.org/0000-0002-3059-2866

autor

Liu Jianning

China University of Mining & Technology (Beijing), State Key Laboratory for Geomechanics and Deep Underground Engineering, Beijing 100083, China

https://orcid.org/0000-0003-3752-015X

autor

Wang Yajun

wangyj@tongji.edu.cn

School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China

https://orcid.org/0000-0002-8759-0175

autor

Yang Gang

China University of Mining & Technology (Beijing), State Key Laboratory for Geomechanics and Deep Underground Engineering, Beijing 100083, China

https://orcid.org/0000-0002-1911-0598

autor

Hou Shilin

China University of Mining & Technology (Beijing), State Key Laboratory for Geomechanics and Deep Underground Engineering, Beijing 100083, China

https://orcid.org/0000-0002-4372-9163+

autor

Wang Yuanjun

ShanXiYinFeng Science & Technology CO. LTD, Taiyuan 030000, China

https://orcid.org/0000-0003-2851-9819

autor

He Manchao

China University of Mining & Technology (Beijing), State Key Laboratory for Geomechanics and Deep Underground Engineering, Beijing 100083, China

https://orcid.org/0000-0002-3617-2707

autor

Yang Jun

China University of Mining & Technology (Beijing), State Key Laboratory for Geomechanics and Deep Underground Engineering, Beijing 100083, China

https://orcid.org/0000-0001-7325-3373

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Bibliografia

Identyfikator YADDA

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