Hydraulic connectivity analysis of multi-aquifers in floor limestone based on underground directional borehole group water discharge tests

CHEN Huiting

doi:10.19956/j.cnki.ncist.2025.03.004

Abstract：To prevent floor water inrush accidents in coal mines and enhance the accuracy of early warning systems,this study investigates the hydrogeological characteristics and hydraulic connections among lime-stone aquifers in the Taiyuan Formation beneath the No.10 coal seam of Panel 105 inYuandian No.1 Coal Mine.Two directional borehole group drainage tests were conducted in the test roadway of Panel 105 to analyze the Taiyuan Formation limestone water.Combined with dynamic monitoring of hydrological obser-vation holes and water quality analysis,the hydraulic linkages between limestone aquifers were systemati-cally evaluated.The results indicate that the water abundance of the Taiyuan Formation limestone exhibits a vertical differentiation pattern characterized by higher water-richness in shallow layers and weaker water-bearing capacity in deeper layers.Strong hydraulic connections exist in shallow L1-L4 limestone layers,while permeability decreases significantly in deeper zones.No notable hydraulic connection was identified between the Taiyuan Formation and Ordovician limestone aquifers.Distinct water quality characteristics further validate the hydraulic independence of the Taiyuan Formation and Ordovician limestone.Given the high water pressure,low water abundance,and heterogeneity of the limestone aquifers beneath the No.10 coal seam,hori-zontal directional boreholes were deployed in the L1-L4 limestone layers of the working face floor to implement drainage and pressure relief,effectively mitigating the risk of floor water inrush and ensuring safe coal extrac-tion.This research provides a scientific foundation for preventing water hazards from floor limestone aquifers in Panel 105 and offers novel insights into the study of hydraulic interactions among multi-aquifer systems.