Critical Conditions and Energy Transfer Characteristics of the Failure Process of Coal-Rock Combination Systems in Deep Mines

Table 4

The newly added surface area of the different combination samples.

No.	Coal weight (g)	Crushed coal weight (g)	Crushed coal weight/coal weight (%)	Converted diameter (mm)	Newly added surface area (mm^2)
A11	127.0	6.3	4.96	1.6976	346813.148
A12	127.1	5.3	4.16	1.5867	371053.129
A13	127.8	6.1	4.77	1.5487	380157.551
A21	126.4	5.2	4.11	1.0826	543829.669
A22	126.4	4.8	3.79	1.1287	521617.790
A23	126.3	4.7	3.72	0.9828	599053.724
A31	126.2	4.6	3.64	0.8277	711308.445
A32	126.7	4.3	3.39	0.8177	720007.338
A33	126.3	4.1	3.24	0.7719	762728.333
B11	127.3	5.1	4.00	0.7828	752107.818
B12	127.4	4.9	3.84	0.7961	739542.771
B13	127.2	5.0	3.93	0.7840	750956.633
B21	101.6	4.8	4.72	0.6019	782522.014
B22	99.2	4.6	4.63	0.5979	787757.150
B23	100.3	4.7	4.68	0.5778	815160.955
B31	82.8	4.1	4.95	0.4423	878532.670
B32	80.1	3.8	4.74	0.4379	887360.128
B33	79.9	3.4	4.25	0.4308	901984.680