Research on Formation Identification Based on Drilling Shock and Vibration Parameters and Energy Principle

Table 14

Rock classification and compressive strength statistics based on drilling specific energy.

Rock classification	Compressive strength (MPa)	Drilling specific energy (kN·m·cm^−3)
		Drill hole 1	Drill hole 2	Drill hole 3	Drill hole 4	Drill hole 5
VI (fill)	0.06	—	0.0214	—	—	—
V	0.7	0.0365	0.0297	0.0208	0.0245	0.0285
V/IV	12.92	0.1056	0.0942	0.1215	0.1105	0.0956
IV (concrete)	28.44	—	0.2798/	—	—	—
IV	35.85	0.2212	0.2564	0.2487	0.2858	0.2452
IV/III	52.76	0.2469	0.3124	0.3345	0.2726	0.2744
III	67.62	0.3849	—	0.3226	0.3419	0.4009
III/II	86.81	0.6512	0.6842	0.6429	0.6145	0.7032
II	100.36	1.2365	1.1256	—	1.1736	1.3456
II/I (vein)	115.78	1.3769	1.4029	—	—	1.4896