An Experimental Investigation of the Progressive Failure of Sandstone and Its Energy Evolution Characteristics

Table 2

Crack parameters of the sandstone specimens.

Sample	(10^−3)	(MPa)	(MPa)	(10^−3)	(10^−3)
S60-1	2.344	28.32	72.84	2.704	0.359	0.867	0.357	0.919
S60-2	1.645	33.63	76.75	2.229	0.584	0.738	0.394	0.898
S100-1	1.594	34.19	80.57	1.792	0.198	0.890	0.382	0.900
S100-2	1.853	36.20	69.46	2.106	0.253	0.880	0.451	0.865
S100-3	1.323	43.14	107.5	1.949	0.626	0.679	0.318	0.793
S100-4	1.134	60.84	130.7	1.572	0.438	0.721	0.360	0.772
S100-5	0.893	61.76	150.8	1.608	0.715	0.555	0.306	0.747
S120-1	2.053	38.96	68.56	2.163	0.110	0.949	0.522	0.919
S120-2	1.847	39.49	69.41	1.989	0.142	0.929	0.550	0.967