Experimental Investigation on Fracture Evolution in Sandstone Containing an Intersecting Hole under Compression Using DIC Technique
Table 2
Experimental results of specimens under axial compression.
Specimen no.
UCS (MPa)
εp (‰)
E (GPa)
eb (kJ·m−3)
ea (kJ·m−3)
k
Failure characteristics
IS-1
100.92
5.57
21.63
100.28
55.38
0.21
Block ejections were observed on the left and right sides of specimens
IS-2
105.61
5.96
21.63
111.42
47.78
0.16
IS-3
101.31
6.97
20.05
114.90
−88.33
/
Unloading and rebound happened at the postpeak stage
TI-1
59.82
5.01
17.82
50.92
36.24
0.25
Spalling fracture appeared first on two sidewalls of the hole, and then macrofailure occurred along with a loud noise and violent rock ejections due to crack coalescence at the postpeak stage
