Study on Damage Law of Raw Coal Based on Different Characterization Methods

Table 1

Main physic parameter of the sample [3].

Mad (%)	Aad (%)	Vad (%)	FCad (%)	(cm/s)	Density (g/cm^3)
0.75	12.31	13.01	73.93	1659	1.385

Mad—moisture content on air dried basis; Aad—ash content on air dried basis; Vad—volatile content on air dried basis; FCad—fixed carbon content on air dried basis; —wave velocity of coal sample.