Experimental Research on Brittleness and Rockburst Proneness of Three Kinds of Hard Rocks under Uniaxial Compression

Table 1

Main mechanical parameters of rock samples.

Rock type	Sample no.	σcd (MPa)	σp (MPa)	εp	σr (MPa)	εr	E (GPa)	Bd	Es (MJ·m^−3)
Basalt	1-1	198.76	281.43	0.00383	0	0.00493	85.79	0.541	0.462
	1-2	208.28	288.32	0.00503	0	0.00600	71.41	0.547	0.582
	1-3	228.05	265.41	0.00561	0	0.00617	73.65	0.568	0.478
Granite	2-1	135.86	200.98	0.00503	0	0.00589	55.63	0.537	0.363
	2-2	131.08	188.32	0.00493	0	0.00569	55.41	0.539	0.309
	2-3	153.93	206.58	0.00494	0	0.00865	53.28	0.475	0.400
Marble	3-1	55.07	125.37	0.00364	0	0.0054	54.50	0.485	0.144
	3-2	56.74	111.83	0.00521	0	0.00695	35.82	0.481	0.175
	3-3	76.38	124.27	0.00444	0	0.00627	44.47	0.483	0.175

σ_cd, σ_p, σ_r are the damage stress, peak strength, and residual strength, respectively; ε_p and ε_r are the peak strain and residual stain, respectively.