Table 8 Risk early warning value and control value of evaluation indicator.

E₁ Friction angle

50 (^o)

35 (^o)

E₂ Soil unit weight

21 (kN/m³)

15 (kN/m³)

E₃ Surface settlement

30 (mm)

21 (mm)

E₄ Retaining pile horizontal displacement

20 (mm)

14 (mm)

E₅ Bottom uplift

30 (mm)

21 (mm)