Research on the water richness and water inrush risk of 4th limestone aquifer in the floor of Zhangshuanglou Coal Mine

Li Nanjun; Chen Tianci; Xiao Qing; Xu Zhimin

doi:10.19896/j.cnki.mtkj.2026.01.015

Abstract：Mine water inrush is one of the main disasters in the production process of coal mines.The effluent from the 4th limestone aq-uifer on the floor of Zhangshuanglou Coal Mine is about 200 m3/h,accounting for 41％ of normal inflow of mine.Analyzing the geolog-ical structure and mining method of the mine,it was found that the shallow mining face and mining area can be treated with drainage and depressurization methods for the floor of 4th limestone aquifer.Further research is needed on the prevention and control of the floor of 4th limestone aquifer during deep coal resource mining.On this basis,research methods such as mathematical statistics,on-site and indoor testing,and vulnerability index method were used to analyze and evaluate the water yield and water inrush risk of 4th limestone aquifer,and on-site engineering verification of water yield and water inrush risk was carried out.The results show that the 4th limestone aquifer extend deeper with the level of mining,and the degree of karst development and water abundance gradually weaken.They are di-vided into medium rich water areas,weak rich water areas,and extremely weak rich water areas from shallow to deep,with obvious verti-cal and block characteristics.Using the vulnerability index method combined with the vertical zoning of karst,it is divided into three zones:the safe zone for water inrush from the floor(Iv≤0.15),the transitional zone for water inrush from the floor(0.10＜Iv ≤0.52),the relatively vulnerable zone for water inrush(0.52＜Iv ≤0.72),and the vulnerable zone for water inrush(Iv＞0.72).A comprehensive evaluation of the risk of water inrush in Taiyuan Formation's 4th limestone aquifer areas,and the implementation of geophysical and drilling field engineering verification of water richness and water inrush risk,can provide theoretical basis for water prevention and con-trol work in the mine.