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

Table 5

Comparison of numerical simulation results with monitoring data.

Item	Measured value	Simulated value	Error
Settlement of vault (mm)	11.89	12.60	−0.71
Surface settlement (mm)	13.22	10.73	2.49
Settlement of riverbed (mm)	14.24	13.73	0.51
Extent of plastic zone (m)	2.30	2.50	−0.20