Study on the Physical Properties and Joint Evolution Characteristics of Three-Dimensional Reconstructed Coal

Table 1

Parameters of geometric characteristics of coal sample 4 joints.

Joint group number	Joint diameter (cm)	Joint surface density (cm^2/cm^3)	Joint angle (°)
1	1.816	0.097	9.821
2	0.452	0.012	10.018
3	0.312	0.006	10.467
4	0.250	0.004	10.821
5	0.209	0.003	10.900
6	0.174	0.002	11.019
7	0.160	0.002	11.513
8	0.147	0.001	11.614
9	0.135	0.001	12.425
10	0.125	0.001	12.502
11	0.007	0.059	44.440