Failure Mechanism of a Coal-Rock Combined Body with Inclinations of Structural Planes and a Calculation Model for Impact Energy

Table 2

Statistical results: strength of the specimens.

Serial number of specimens	(MPa)	(%)	Serial number of specimens	(MPa)	(%)
CR-0-1	32.1103	−4.21	CR-30-1	17.3016	−4.94
CR-0-2	33.1421	−1.13	CR-30-2	19.3541	6.34
CR-0-3	35.3115	5.34	CR-30-3	17.9453	−1.4
Mean	33.5213		Mean	18.2003
CR-15-1	25.9652	−2.91	CR-45-1	12.5735	−3.69
CR-15-2	28.2658	5.69	CR-45-2	13.6984	4.92
CR-15-3	26.0026	−2.77	CR-45-3	12.8954	−1.23
Mean	26.7445		Mean	13.0558
PC-1	26.1556	4.75	PR-1	48.0924	2.52
PC-2	24.5884	−1.53	PR-2	46.7412	−0.36
PC-3	24.1654	−3.22	PR-3	45.8905	−2.17
Mean	24.9698		Mean	46.908