Risk Assessment System Based on Fuzzy Composite Evaluation and a Backpropagation Neural Network for a Shield Tunnel Crossing under a River

Table 7

Evaluation sample set.

Working conditions	X1	X2	X3	X4	X5	X6	X7	X8	Y1 (mm)	Y2 (mm)	Y3 (mm)	Y4 (m)
1	0.6	0.4	0.2	0.2	0	0	0.2	0.2	32.5	17.4	28.2	3.0
2	0.6	0.4	0.2	0.8	1	0.2	0.2	0.2	16.1	10.9	14.1	0
3	0.6	0.4	0.2	0.8	1	0.6	0.6	0.6	12.6	10.7	13.7	0
⋮	⋮	⋮	⋮	⋮	⋮	⋮	⋮	⋮	⋮	⋮	⋮	⋮
25	0.4	0.4	0.4	0.2	0	0	0.2	0.2	70.9	45.9	60.6	6.0

Notes. X₁–X₈ are the quantified values of x₁–x₈, respectively; Y₁–Y₄ are the deformation values of vault settlement, surface settlement, riverbed settlement, and plastic-zone range, respectively.