Analysis of Failure Characteristics and Strength Criterion of Coal-Rock Combined Body with Different Height Ratios

Table 1

Grouping of coal-rock combined samples and their basic parameters.

Specimen number	Diameter (mm)		Height (mm)			Weight (g)		Confining pressure (MPa)	Density ρ/g·cm^−3
	Dr	Dc	Hr	Hc	Ht	mr	mc
Rock	50.09		100.79			544.75		0	2.744
Rock	50.16		101.83			547.25		5	2.720
Rock	50.18		101.88			541.45		10	2.688
Coal		50.06		100.60			275.25	0	1.390
Coal		50.05		102.07			277.30	5	1.381
Coal		50.15		102.56			280.40	10	1.384
RCB-2-1	50.12	50.09	66.81	33.99	100.99	90.25	360.10	0	2.254
RCB-2-1	50.11	50.14	66.90	34.46	101.65	92.03	360.47	5	2.256
RCB-2-1	50.02	50.14	66.82	34.01	101.07	89.53	356.67	10	2.241
RCB-1-1	50.14	50.19	49.90	51.63	101.65	133.45	265.50	0	1.985
RCB-1-1	50.14	50.13	49.99	51.16	101.34	132.63	265.13	5	1.988
RCB-1-1	49.95	50.16	51.71	49.76	101.86	136.53	256.60	10	1.962
RCB-1-2	50.03	50.12	34.58	65.93	100.7	175.10	181.65	0	1.803
RCB-1-2	50.03	50.06	34.44	66	100.61	176.50	180.57	5	1.804
RCB-1-2	50.04	50.09	34.22	65.87	100.31	178.23	181.67	10	1.822
RCB-1-3	49.91	50.07	25.55	75.73	101.41	200.30	130.05	0	1.659
RCB-1-3	49.91	50.07	25.55	75.73	101.49	200.30	130.05	5	1.659
RCB-1-3	50.12	50.12	24.88	76.94	102.2	205.00	135.25	10	1.688