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

Figure 4

Risk-factor-indicator deformation value relationship diagram. (a) Perimeter rock grade. (b) Burial depth. (c) Depth of cover. (d) Excavation interval. (e) Synchronous slurry strength. (f) Secondary slurry strength. (g) Injection pressure. (h) Soil bin pressure.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)