The Effect of High Loading Rate on the Behaviour and Mechanical Properties of Coal-Rock Combined Body

Table 2

Test results of dynamic compressive tests of coal-rock combined body.

No.	(MPa/s)	(s^−1)	(MPa)	(MPa)	(GPa)	(GPa)	(J)	(J)	(J)	(J)
A1	2.71×10^5	65.90	11.06	28.23	7.5	2.2	55.67	37.54	2.89	15.23
A2	2.74×10^5	70.25	9.51	34.43	8.2	2.3	52.02	34.83	6.75	10.44
A3	2.98×10^5	65.90	9.36	37.23	6.8	2.7	60.49	40.02	3.87	16.58
A4	3.36×10^5	77.07	9.43	41.32	8.5	2.6	79.81	56.91	6.22	16.67
A6	3.41×10^5	80.14	10.63	43.36	7.5	2.8	88.15	58.93	5.85	23.35
A7	4.01×10^5	92.12	10.20	44.49	8.0	2.8	107.42	74.38	6.00	27.03

Note. : loading rate; : strain rate; : the first peak stress; : the second peak stress; : absorption energy; : the first elastic modulus before the first peak stress; : the second elastic modulus before the second peak stress; : incident energy; : reflective energy; : transmitted energy.