Research on Non-Pillar Coal Mining for Thick and Hard Conglomerate Roof

Xiaoyu Liu, Manchao He, Jiong Wang and Zimin Ma
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Xiaoyu Liu: State Key Laboratory of Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China
Manchao He: State Key Laboratory of Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China
Jiong Wang: State Key Laboratory of Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing 100083, China
Zimin Ma: School of Resource and Environmental Engineering, Shandong University of Technology, Zibo 255000, China

Energies, 2021, vol. 14, issue 2, 1-14

Abstract: This article introduces a new non-pillar coal mining technology (i.e., Gob-side Entry Retaining by Roof Cutting (GERRC)) under the condition of thick and hard roofs. First, we theoretically analyzed the solution to the large suspension span of the thick and hard roof in coal mining. Three-Zone pre-split blasting design in non-pillar coal mining for thick and hard roofs was proposed, based on the principles of rock mechanics. After field experiments, the technology was successfully applied to the non-pillar coal mining of a huge thick conglomerate roof. This research supplements the non-pillar mining technology system. The proposed technologies and methods have strong applicability and have certain guiding significance for the safe and efficient mining of related coal mines.

Keywords: thick conglomerate roof; thick and hard roof; roof cutting and pressure release; gob-side entry retaining; non-pillar coal mining; deep hole blasting; pre-split blasting (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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