A Study on Disasters Induced by Head-On Ejection in High-Speed Driving under the Influence of Roof Drainage

Fenghui Li (), Yunhai Cheng, Xiufeng Zhang, Dong Li and Shunjie Huang
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Fenghui Li: School of Mining Engineering, Anhui University of Science and Technology, Huainan 232000, China
Yunhai Cheng: School of Mining Engineering, Anhui University of Science and Technology, Huainan 232000, China
Xiufeng Zhang: Coal Burst Prevention and Control Research Centre, Yankuang Group Co., Ltd., Zoucheng 273500, China
Dong Li: School of Mechanical and Electrical Engineering, Huainan Normal University, Huainan 232038, China
Shunjie Huang: School of Mining Engineering, Anhui University of Science and Technology, Huainan 232000, China

Sustainability, 2023, vol. 15, issue 11, 1-15

Abstract: During the gob-side entry driving of the Jurassic coal seam in Western China, ejection disasters occur under the influence of roof drainage, which rarely appear in the eastern mining area. To address this problem, a method combining theoretical analysis, numerical simulation, and field monitoring was used to study the disaster induced by head-on ejection during speedy driving under the influence of roof drainage in the context of gob-side entry driving of the 2202 auxiliary haulage roadway in a mine. A calculation model for the critical energy conditions for disasters induced by head-on ejection was established. The relationships between the driving velocity and the dynamic and static loads on the driving face and the disasters induced by ejection were clarified under the influence of roof drainage. The results indicate that the energy threshold for ejection-induced disaster is 12.23 kJ, and the elastic energy of the driving face induced only by static load fails to reach the energy threshold. When the driving velocity exceeds 5 m/d, microseismic activity in front of the driving face increases in a stepwise manner, and the influence of dynamic load intensifies. The superposition of accumulated elastic energy induced by static load and the energy transmitted by microearthquake to the driving face exceeds the energy threshold, resulting in the risk of ejection-induced disaster. Based on this, measures such as microseismic monitoring in front of the driving face, advanced pulverized coal monitoring, driving speed adjustment, and advanced pressure relief of large-diameter boreholes are adopted to ensure safe driving.

Keywords: roof drainage; roadway driving along goaf; rapid excavation; head-on ejection (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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