Page 50 - Design Considerations Based on Quantitative Risk Assessments for Slopes

Quantitative Risk Assessment

Travel Distance

▪ Travel Distance by Dependent Equation

variable
Finlay et al (1999) LCI Log L = 0.062 + 0.965 Log H – 0.558 Log (tan d)

✓ Based on 1100 data Cut Slope Mean Log L = 0.109 + 1.010 Log H – 0.506 Log (tan d)

of man-made slopes UCI Log L = 0.156 + 1.055 Log H – 0.454 Log (tan d)
for the period 1983- LCI Log L = 0.269 + 0.325 Log H + 0.166 Log (V/W)

1994
Fill Slope Mean Log L = 0.453 + 0.547 Log H + 0.305 Log (V/W)
✓ Suitable for granitic UCI Log L = 0.693 + 0.768 Log H + 0.443 Log (V/W)

and volcanic LCI Log L = 0.037 + 0.350 Log H + 0.108 Log (V/W)
formation
Retaining Mean Log L = 0.178 + 0.587 Log H + 0.309 Log (V/W)
✓ Can be used only Wall UCI Log L = 0.319 + 0.825 Log H + 0.150 Log (V/W)

when debris runs on LCI Log L = 0.041 + 1.515 Log H – 0.629 Log (tan d)
horizontal surface
Boulder Fall Mean Log L = 0.253 + 0.703 Log H – 0.417 Log (tan d)
UCI Log L = 0.466 + 0.891 Log H – 0.206 Log (tan d)