The Stress Evolution of Adjacent Working Faces Passing through an Abandoned Roadway and the Damage Depth of the Floor

Song Shi, Yichen Miao, Haikuan Wu, Zhipeng Xu and Changwu Liu
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Song Shi: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
Yichen Miao: Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China
Haikuan Wu: School of Emergency Science, Xihua University, Chengdu 610039, China
Zhipeng Xu: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China
Changwu Liu: College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China

Energies, 2022, vol. 15, issue 16, 1-17

Abstract: An advanced break or a vast region of pressurisation may occur when the working face passes through an abandoned roadway, resulting in a roof falling or water inrush. The stress evolution of the working face passing through an abandoned roadway in a coal mine was comprehensively discussed using theoretical analysis, numerical simulation, and field monitoring. In this study, the calculated critical width of the abandoned roadway where the main roof was bound to an advanced break was 5.4 m. Reducing the suspended length of the main roof is beneficial to the stability of the working face’s passage across the abandoned roadway. The maximum abutment stress on the roof occurred at the working face through a semi-abandoned roadway, reaching 44.3 MPa. Subsequently, it decreased sharply until the working face completely passed and returned to the normal level. The damage depths of the floor strata from the field monitoring were 15 and 20 m, which showed that the use of hydraulic fracturing technology combined with floor grouting and hydraulic support for the abandoned roadway was proposed to stabilise the working face for safe mining.

Keywords: adjacent working face; abandoned roadway; stress evolution; numerical simulation; field monitoring (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: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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