Strain Rate Effect on Acoustic Emission Characteristics and Energy Mechanisms of Karst Limestone under Uniaxial Compression

Table 2

Strain energy at peak strength under different loading rates.

Number	Strain rate (ε′/s)	lg(ε′)	U (MJ/m^3)	U^e (MJ/m^3)	U^d (MJ/m^3)	U^e/U	U^d/U	U^d/U^e
S11	5 × 10^−6	−5.30	0.0994	0.0768	0.0226	0.7724	0.2276	0.2947
S12	5 × 10^−6	−5.30	0.0730	0.0633	0.0097	0.8674	0.1326	0.1529
S21	2 × 10^−5	−4.70	0.1239	0.1085	0.0154	0.8756	0.1244	0.1421
S22	2 × 10^−5	−4.70	0.1140	0.1016	0.0124	0.8912	0.1088	0.1221
S31	1 × 10^−4	−4.00	0.1577	0.1411	0.0165	0.8951	0.1049	0.1172
S32	1 × 10^−4	−4.00	0.1894	0.1338	0.0556	0.7065	0.2935	0.4155
S41	5 × 10^−4	−3.30	0.2492	0.1861	0.0631	0.7467	0.2533	0.3392
S42	5 × 10^−4	−3.30	0.2081	0.1745	0.0337	0.8383	0.1617	0.1929