Identification of Initial Crack and Fracture Development Monitoring under Uniaxial Compression of Coal with High Bump Proneness

Table 3

Dimension and crack ratio of coal sample.

Sample no.	Diameter (mm)	Height (mm)	Crack ratio (%)
1	50.14	100.84	0.04
2	50.21	100.10	0.12
3	50.11	100.03	0.32
4	50.17	100.05	0.06
5	50.12	100.63	0.18
6	50.08	100.42	0.27
7	50.04	100.04	0.03
8	50.17	100.84	0.14
9	50.02	100.45	0.35