Classification and Application of Roof Stability of Bolt Supporting Coal Roadway Based on BP Neural Network

Table 4

Testing samples.

Sample number	Test sample						Type of roof stability	Stable type code
	L	D	σc	B	N	H
1	3.00	0.24	0.29	0.92	0.81	1.04	IV	0.00 0.00 0.00 1.00
2	0.49	0.59	0.42	0.62	0.65	0.63	III	0.00 0.00 1.00 0.00
3	0	1.49	0.76	0.52	0	0.34	I	1.00 0.00 0.00 0.00
4	0.80	0.47	0.45	0.70	0.60	0.66	III	0.00 0.00 1.00 0.00
5	0.35	0.98	0.68	0.60	0.41	0.46	II	0.00 1.00 0.00 0.00
6	2.20	0.12	0.22	0.90	0.87	1.33	IV	0.00 0.00 0.00 1.00
7	0	1.38	0.84	0.50	0	0.17	I	1.00 0.00 0.00 0.00
8	0.42	0.94	0.55	0.60	0.29	0.42	II	0.00 1.00 0.00 0.00