Effects of Cyclic Loading on the Pore Structure of Anthracite Coal

Table 2

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

Loading condition		Porosity (%)
Frequency (Hz)	Amplitude (MPa)	Micropores (<10 nm)	Transition pores (10–100 nm)	Mesopores (100–1,000 nm)	Macropores (>1,000 nm)	Porosity (%)
4	12–18	2.42	0.69	2.06	7.55	12.71
7		2.02	1.42	5.15	5.83	14.41
10		3.15	2.11	5.88	8.68	19.81
—	15	2.15	1.60	4.40	3.18	11.32