Strength and Microscopic Damage Mechanism of Yellow Sandstone with Holes under Freezing and Thawing

Table 1

Microdamage mode table.

Microscopic damage mode	(1) Particle flaking	(2) Pore is granules filling	(3) Pore expansion	(4) Pore shrinkage	(5) Pore connectivity
Microscopic under the microscope damage before
Microscopic under the microscope damage after