Study on Impact Tendency of Coal and Rock Mass Based on Different Stress Paths

Table 2

Apparent density of coal seam and rock roof samples.

Rock stratum	Serial number						Average apparent density (g/cm^3)
	1	2	3	4	5	6
Argillaceous sandstone	2.38	2.33	2.35	2.37	2.32	2.36	2.35
Coal	1.39	1.38	1.45	1.43	1.45	1.42	1.42
Silty sandstone	2.26	2.25	2.31	2.27	2.26	2.28	2.27