Study on Occurrence Mechanism and Prevention Technology of Rock Burst in Narrow Coal Pillar Working Face under Large Mining Depth

Shitan Gu, Huaixu Chen, Wenshuai Li (), Bangyou Jiang () and Xiang Chen
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Shitan Gu: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Huaixu Chen: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Wenshuai Li: Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, China
Bangyou Jiang: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Xiang Chen: Shandong Jining Yunhe Coal Mine Co., Ltd., Jining 272000, China

Sustainability, 2022, vol. 14, issue 22, 1-17

Abstract: This paper presents a collaborative control scheme involving “unloading-solidifying” to prevent rock bursts during narrow pillar recovery at large mining depths. In this study, the stress distribution rule of coal rock mass during the excavation and mining process is studied, and the energy accumulation characteristics of the overlying hard and thick roof structure are investigated. In this way, the rock burst inducing mechanism of the narrow coal pillar working face under complex conditions is investigated. The results show that the peak lateral bearing pressure of the goaf and the maximum horizontal principal stress provide the static load condition for the occurrence of rock burst during roadway excavation. Affected by the superposition of “near-field high static load + far-field dynamic load”, it is extremely easy to reach the critical destabilization value during the mining period at the narrow coal pillar working face. According to the monitoring results, the developed coordinated control scheme, which focuses on the strong pressure relief and strong support in near-field high-bearing pressure coal mass and the pressure relief in far-field high-level hard roof with an advanced pre-cracking roof, can effectively avoid the occurrence of rock burst accidents on narrow coal pillar working face.

Keywords: narrow coal pillar; rock burst; rock burst inducing mechanism; hard roof; prevention and control (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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