Abstract
Coal mine floor limestone aquifers are a major source of water inrush from the coal seam floor and a serious threat to the safety of coal mining. In order to reduce and avoid the occurrence of water inrush within the coal mine, we use multiple detection techniques, which are geophysical exploration technology, drilling technology, water inrush accidents and tracer test, to develop a multi-faceted exploration of karst development and analyze its development characteristics in the Chaochuan mine No. 1 well. The results show that, the Cambrian limestone (CL) karst water is poor; there is a certain hydraulic connection. Near faults F5, F1, F125, and SF28, the area is less water-rich area, and the deep karst water forms a closed area; 61.54 % of shallow water inrush accidents in the Taiyuan limestone and CL karsts were caused by large tectonic and nearby shallow faults. The karst vertical zonation is shallow; the shallow water level decreased more in the West Wing of the No. 1 well than in the East Wing.
Highlights
Water inrush from the coal seam floor has always threatened safe production in mines
The transient electromagnetic exploration results showed that the No 1 well water-rich anomaly area was scattered, and the area was less than 20 % of the entire exploration area, indicating that the Cambrian limestone (CL) aquifer was weakly water-rich as a whole
There were few water-rich anomalies near the F1, F5, F125, and SF28 faults, which proved that these faults were poorly water-rich and water-conducting, making the deep karst water form an independent closed system
Summary
Water inrush from the coal seam floor has always threatened safe production in mines. Due to its karst development, strongly water-rich with good connectivity, limestone is the main water source for the coal seam floor under mining conditions, seriously threatening safe mining of coal (Qiao et al, 2014; Dong, 2010; Yang et al, 2018). Wang (Wang et al, 2016a; Wang et al, 2018) have studied the water rich characteristics of the Cambrian limestone in the No 2 well of the Pingdingshan coal field and formulated the related countermeasures for water control by using geological drilling, field connectivity tests, water drainage drilling, water temperature field monitoring, and transient electromagnetic exploration. A comprehensive analysis of the Cambrian limestone (abbreviated as CL) karst development characteristics of the No 1 well coal seam floor is performed, and provide a beneficial reference for the prevention and control of mine water hazards in the future and reduce the probability of water inrush accident in karst aquifer of coal seam floor
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