The Stability Evaluation of Shaft during Drastic Drawdown Dewatering of Alluvium

Table 6

Training sample of shaft stability.

Shaft name	x1 (mm·a^−1)	x2 (mm)	x3 (m)	x4 (m)	x5 (m)	x6	x7	Shaft state	Discriminant value y
Auxiliary shaft in the Linhuan mine	47	426	240	7.2	0.77	1	0	Failure	57.243
Main shaft in the Haizi mine	60	503	247	6.5	0.8	1	1	Failure	59.287
Auxiliary shaft in the Haizi mine	60	503	247	7.2	0.71	1	0	Failure	57.643
Auxiliary shaft in the Luling mine	50	400	200	6.1	1.25	1	0	Failure	54.436
Main shaft in the Zhangshuanglou mine	38	466	242	5.5	0.83	1	1	Failure	56.309
Auxiliary shaft in the Zhangshuanglou mine	38	466	242	5.5	1	1	1	Failure	57.405
Main shaft in the Tongting mine	30	306	230	5.3	2.2	0	0	Failure	58.181
Auxiliary shaft in the Tongting mine	30	306	230	6.55	1.67	0	0	Failure	56.037
Ventilation shaft in the Tongting mine	30	306	230	5.0	1.11	1	0	Failure	56.442
Main shaft in the Dongtan mine	15.7	353.3	108.17	7	0.91	1	1	Stable	33.970
North ventilation shaft in the Dongtan mine	9.14	186.6	111.04	6	1.25	1	1	Stable	37.370