Application and Evaluation of Regional Control Technology of Limestone Water Hazard: A Case Study of the Gubei Coal Mine, North China

Table 1

Regional exploration and treatment effect verification of outlet drilling.

Bore no.	Hole depth (m)	Water exit formation	Water inflow (m^3/h)	Water temperature (°C)	Water pressure (MPa)	Water quality type
Y3-2	471	C3^3down limestone	0.30	30	0	Cl·HCO3-Na+K
Y3-6	351	C3^3down limestone	0.42	32	0.10	Cl·HCO3-Na+K
Y3-8	636	C3^5 limestone	0.10	35	0	Cl·HCO3-Na+K
Y3-9	597	C3^5 limestone	1.00	34	0	Cl·HCO3-Na+K
Y3-10	615	C3^5 limestone	0.30	34	0.70	Cl·HCO3-Na+K