Key technologies and its application of gob-side entry retaining by roof cutting in a deep mine

• Autorzy: Chen Shangyuan , Lv Qian , Yuan Yue

Identyfikatory

DOI

10.24425/ams.2022.140702

• Języki publikacji: EN

Abstrakty

EN

There are many problems associated with the surrounding rocks of the gob-side entry retaining by roof cutting (GERRC) as they are difficult to stabilise in deep mines. The following needs to be studied to understand the problems such as the pressure relief mechanism, evolution law of the surrounding-rock stress and the key technologies of GERRC in deep mines. Cracks are formed by advanced directional blasting to sever the path of stress transmission from the roof of the goaf to the roof of the entry and reduce the lateral cantilever length of the roof. Therefore the surrounding-rock stress and roof structure are optimised. The broken and expanded gangue formed by the collapse of the strata in the range of roof cutting fills the mining space adequately, which avoids a rapid pressure increase caused by the roof breaking impact and slows down the movement of overlying strata. The deformation of the deep surrounding rocks is transformed from “abrupt” to “slow”, and the surrounding-rock deformation of the retained entry in deep mines is significantly reduced. The average pressure and periodic pressure of the supports near the blasting line can be reduced by the blasting cracks to a certain extent, mainly due to the reduction of the length of the immediate roof cantilever and the effective load of the main roof. The combined support technologies for GERRC in deep mines were proposed, and field tests were performed. The monitoring results show that the coordinated control system can effectively control the deformation of deep rock masses, and all indexes can meet the requirements of the next working face after the retained entry is stabilised.

Słowa kluczowe

EN

deep mine; gob-side entry retaining; cooperative control; engineering applications

PL

kopalnia głębinowa; naprężenia skał; strop wyrobisk górniczych

• Wydawca: Instytut Mechaniki Górotworu PAN
• Czasopismo: Archives of Mining Sciences
• Rocznik: 2022
• Tom: Vol. 67, no. 1
• Strony: 55--77
• Opis fizyczny: Bibliogr. 31 poz., fot., rys., tab., wykr.

Twórcy

autor

Chen Shangyuan

• School of Civil and Architectural Engineering, Anyang Institute of Technology, Anyang 455000, China

• https://orcid.org/0000-0002-2881-006X

autor

Lv Qian

• School of Civil and Architectural Engineering, Anyang Institute of Technology, Anyang 455000, China

• https://orcid.org/0000-0002-9777-8729

autor

Yuan Yue

• Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan University of Science and Technology, Xiangtan 411201, China

• https://orcid.org/0000-0002-4384-0339

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Uwagi

PL

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023)