Experimental Study on Dynamic Characteristics of Annular Coal Mine Sandstone after Different Temperatures

Table 2

Basic physical parameters of intact samples.

Temperature/°C	Specimen number	Before heating			After heating
		Diameter (mm)	Height (mm)	Quality (g)	Diameter (mm)	Height (mm)	Quality (g)
25	DJ02-01	50.04	24.95	125.81	Unheated
	DJ02-02	50.05	24.92	122.17
100	DJ02-07	50.08	24.92	125.82	50.07	24.96	124.15
	DJ02-08	50.08	24.91	125.48	50.11	24.92	123.70
200	DJ02-09	50.06	24.91	125.21	50.05	24.96	120.68
	DJ02-10	50.03	24.95	125.38	50.06	24.97	121.88
300	DJ02-13	50.10	24.91	124.61	50.14	25.01	120.43
	DJ02-16	50.08	25.08	126.94	50.10	25.18	122.93
400	DJ02-18	50.08	25.00	125.76	50.15	25.13	121.41
	DJ02-19	50.10	25.05	125.14	50.19	25.14	120.62
500	DJ02-21	50.07	24.90	121.30	50.18	25.03	116.63
	DJ02-22	50.04	24.94	125.05	50.14	25.11	119.84