A Nonlinear Optimization Technique of Tunnel Construction Based on DE and LSSVM

Table 2

The results of optimization compared with original and orthogonal schemes.

	Anchor length; (m)	Anchors space; (m)	Anchor diameter; (mm)	Shotcrete thickness; (cm)	AD; (mm)	BC; (mm)	Supporting cost; (Yuan)
Optimized value	2.3	0.97	19	30	24.83	2.53	10482.61
Original scheme	3.0	1.0	22	30	24.80	2.52	11865.37
Scheme 4	2.0	1.0	40	30	24.83	2.53	26063.87
Scheme 8	2.5	0.9	40	35	20.89	2.59	35783.16
Scheme 19	3.5	1.0	20	35	20.86	2.58	14684.19