Research on water body detection and water inrush risk of isolated full-mechanized working face

Abstract

This paper takes Jimei 23101 isolated working face as an example, uses mechanical model analysis, multiple empirical formula calculations and numerical simulation methods to analyze the development and penetration of overlying rock fissures before and after the mining of isolated working faces and adjacent working faces. Combining survey data, ground and underground transient electromagnetic detection results are used to analyze the occurrence of water accumulation in the water above the isolated working face and adjacent goaves, and using drilling methods to verify on-site water accumulation in the goaf analyzed by theory and geophysical prospecting. The results of geophysical, geochemical, and drilling show that there is a roof fissure in the overlying strata of the 23101 working face, and a lot of gob water in the 21051 working face of the adjacent Jiyuan No.3 mine above it; when the 23101 working face is not mined, the average development height of water-conducting fissures in the adjacent 23001 working face below it is 58.43 m, and the average development height of water-conducting fissures in the 23051 working face of the adjacent Jiyuan No.3 mine above it is 57.31 m. And the two are not connected; when the 23101 working face is stopped, the average height of cracks in the 23101 working face is 60.94 m, it can be connected to the fissure zone of 21051 working face of the adjacent Jiyuan No.3 mine above, the gob water of the 21051 working face can threaten the normal mining of the 23101 working face. Therefore, the advanced discharge of roof fissure water in 23101 working face and old goaf water in the corresponding working face is a necessary measure to ensure safe mining.

Keywords

• isolated working face
• goaf water
• permeable fractured channel
• water body detection
• transient electromagnetic