Evaluation Method of Water Hazard Control Effect of Coal Seam Floor in Deep Mining: Sequence Verification Evaluation

Table 5

Data of PPT and core drilling.

No.	Hydraulic pressure (MPa)	Time (min)	Regime flow (L/min)	Drilling radius (m)	Test length (m)	Fracture thickness (m)	Fissure ratio of the test section (%)
D-1	6	30	39	0.075	25.69	18.32	1.58
D-2	6	30	28	0.075	35.4	21.59	1.20
D-3	7	30	35	0.075	36.98	29.81	0.89
D-4	7	30	52	0.075	38.54	24.32	1.25