Abstract: To address the challenge of water inrush disasters induced by unclear water abundance and hydraulic connec tivity in overlying strata during mining face clusters crossing gully-developed areas,this study focuses on the over-drainage area of the 20118 working face and its adjacent working face group in the east wing of Yushuwan Coal Mine as an engineering exam ple.Utilizing transient electromagnetic (TEM) detection technology,key parameters including power supply pulse width,trans mission current intensity,coil dimensions,and stacking frequency were calibrated for their applicability to stratigraphic struc tures.The spatial distribution characteristics of resistivity anomalies in Quaternary unconsolidated layers,Jurassic Zhiluo For mation,and Yan′an Formation sandstone fissure aquifers were analyzed,and hydraulic connectivity within the overlying rock structure was clarified.Key findings include:① Optimal detection parameters for thick sandstone formations in gully-developed areas of Yushen Mining District are:power supply pulse width of 10 m/s,transmission current intensity of 100 A,transmitter coil dimensions of 2 m×2 m,and stacking frequency of 30 times;② The overlying strata in gully-developed areas,from surface to depth,comprise Quaternary unconsolidated layers,Neogene Baode Formation,Jurassic Zhiluo Formation,and Yan′an Forma tion,with resistivity exhibiting a "low-medium-low-high" layered pattern;③ The apparent resistivity of the detected strati graphic cross-sections ranges between 15~115 Ω·m,with low-resistivity anomalies identified in Jurassic Zhiluo and Yan′an Formation sandstones;④ Four weakly water-enriched zones were detected across the study area,including two weakly connect ed zones (No.1 zone and No.2 zone) and two strongly connected zones (No.3 zone and No.4 zone) between Zhiluo Forma tion sandstones and the 2-2 coal seam roof sandstone.The results provide critical insights for roof water hazard mitigation and waterabundancedetectioninoverlyingstrataof analogousgully-developedregions.

Key words: gullydevelopment area,transient electromagneticmethod,water-richcharacteristics,hydraulicconnectivity, roofwaterhazard