NMR Pore Structure and Dynamic Characteristics of Sandstone Caused by Ambient Freeze-Thaw Action

Table 2

Porosity variation of sandstone after different freeze-thaw cycles.

Piece number	Saturated rock porosity after different freeze-thaw cycles%					Percentage increase in porosity%
	0	20	60	100	140
140-1	7.207	8.018	9.362	9.76	11.400	58.18
140-2	8.156	9.317	9.842	10.84	12.518	53.48
140-3	7.519	8.383	9.326	10.264	11.227	49.32
140-4	8.142	9.572	10.146	10.797	11.668	43.31
140-5	7.910	8.417	9.728	10.845	12.202	54.26
Average value	7.787	8.741	9.681	10.501	11.803	51.71