Application of Shallow-Hole Blasting in Improving the Stability of Gob-Side Retaining Entry in Deep Mines: A Case Study

Yong Chen, Shuqi Ma, Yugui Yang, Ningkang Meng and Jianbiao Bai
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Yong Chen: State Key Laboratory of Coal Resource and Safe Mining, China University of Mining and Technology, Xuzhou 221008, China
Shuqi Ma: State Key Laboratory of Coal Resource and Safe Mining, China University of Mining and Technology, Xuzhou 221008, China
Yugui Yang: State Key Laboratory for Geomechanics and Deep Underground Engineering; China University of Mining and Technology, Xuzhou 221008, China
Ningkang Meng: State Key Laboratory of Coal Resource and Safe Mining, China University of Mining and Technology, Xuzhou 221008, China
Jianbiao Bai: State Key Laboratory of Coal Resource and Safe Mining, China University of Mining and Technology, Xuzhou 221008, China

Energies, 2019, vol. 12, issue 19, 1-16

Abstract: The hanging of hard roof strata in the gob-side retaining entry in deep mines could lead to dynamic disasters. The pressure relief mechanism for the hard roof strata using shallow-hole blasting was investigated by a combined method of theoretical analysis, numerical simulation, and field test in the Sanhejian coal mine. The shallow-hole blasting model was established using LS-DYNA3D (Livemore software of explicit dynamics analysis code). The evolution and propagation law of effective stress induced by shallow-hole blasting was analyzed. The parameters related to shallow-hole blasting were determined via a combined method of numerical analysis and theoretical calculations. These were applied to the field tests. The effect of shallow-hole blasting on the strata control of deep gob-side retaining entry was studied by comparing two scenarios in the field: a deep gob-side retaining entry with and without shallow-hole blasting. It was found that the convergences of the entry decreased due to the shallow-hole blasting. This indicates that shallow-hole blasting is a good technique to maintain the stability of the gob-side retaining entry with a hard roof in deep mines.

Keywords: gob-side entry retaining; deep mine; shallow-hole blasting; hard roof (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: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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