The Study of the Supernormal Mechanical Properties of Giant NPR Anchor Cables

Table 3

Deep Newton force monitoring warning level and warning criteria.

Warning level	Critical forecast	First-level criterion: Newton force T (kN)	Secondary criterion: Newton force increase ΔT (kN)
Blue	Stability warning	0–200	20–50 rise to yellow	50–100 rise to orange	>100 rise to red
Yellow	Substability warning	200–400	Newton force rise (burst)
Orange	Close slip warning	400–600	Newton force rise (burst)
Red	Warning time of the landslide	More than 600	Sudden drop of Newton force

Note. Newton force T = T_n−T₀; Newton force increase ΔT = T_n−T_n-1; initial prestress T₀ = 200 kN.