The distance between the coal floor and the ash roof of Taiyuan Formation 1 is 9~21.18m, with an average of 16.66m m. The main lithology is mudstone and sandstone interbedded with thin layers of fine sandstone locally, with occasional small cracks. Under normal conditions, it has certain water-resisting effect.(4) Carboniferous Taiyuan Formation limestone karst fissure aquifer (group)A total of 153 limestone boreholes of Taiyuan formation are found in the mine, of which 18 boreholes are disclosed for all strata of Taiyuan formation, with a thickness of 82.13 ~ 131.20 m, an average thickness of 118.34m, 12 ~ 13 layers of limestone, and an average total thickness of 51.83m, accounting for 44% of the group thickness. Among them, C33, C34 and C312 layers of limestone are relatively thick, with an average cumulative thickness of 31.41m, accounting for 61% of the total thickness of limestone.