Crack Evolution Characteristics and Cracking Mechanism of Red Beds in Central Sichuan during Seepage and Swelling

Table 2

Basic physical properties of samples.

Sample number	Lithology	Method of water absorption	Initial water content (%)	Thickness (mm)	Diameter (mm)	Natural density (g/cm^3)
1#	Mudstone	Capillary absorption	4.01	23.82	65.51	2.49
2#			2.95	24.23	63.17	2.51
3#			1.56	23.92	64.35	2.51
4#		Soaking absorption	4.01	23.94	64.35	2.51
5#			2.90	24.06	64.50	2.51
6#	Argillaceous sandstone	Soaking absorption	3.37	24.00	64.10	2.49
7#			2.56	24.30	64.66	2.49
8#	Sandstone		3.34	24.20	64.42	2.46