Effects of Cyclic Loading on the Pore Structure of Anthracite Coal

Table 5

Percentages of the pore volume at different loading amplitudes.

Loading condition		Percentage of the pore volume (%)
Frequency (Hz)	Amplitude (MPa)	Micropores (<10 nm)	Transition pores (10–100 nm)	Adsorption pores	Mesopores (100–1,000 nm)	Macropores (>1,000 nm)	Seepage pores
7 Hz	10–20	17.51	15.23	32.74	46.10	21.16	67.26
	12–18	14.00	9.27	23.27	39.88	36.85	76.73
	14–16	16.68	13.34	30.02	37.61	32.37	69.98
—	15	16.70	17.15	33.85	47.66	18.49	66.15