Effects of Cyclic Loading on the Pore Structure of Anthracite Coal

Table 6

Comparison of the growth amplitudes of the porosity under different loading conditions.

Frequency (Hz)	Amplitude (MPa)	Total porosity	Growth amplitude (%)	Growth amplitude of adsorption pores (%)	Growth amplitude of seepage pores (%)
—	15	11.32	—	—	—
7	10–20	10.22	−9.75	−12.00	−8.58
	12–18	14.41	27.29	−8.37	45.02
	14–16	14.47	27.79	14.10	34.63
4	12–18	12.71	12.26	−17.33	26.95
7		14.41	27.29	−8.27	45.05
10		19.81	74.99	40.00	92.34