Effects of Cyclic Loading on the Pore Structure of Anthracite Coal

Table 4

Percentages of the pore volume and porosities of coal mass at different loading amplitudes.

Loading condition		Porosity (%)
Frequency (Hz)	Amplitude (MPa)	Micropores (<10 nm)	Transition pores	Mesopores	Macropores	Porosity (%)
7	10–20	1.95	1.35	3.35	3.57	10.22
	12–18	2.02	1.42	5.15	5.83	14.41
	14–16	2.51	1.77	4.97	5.22	14.47
—	15	2.15	1.60	4.40	3.18	11.32