Risk and Reliability-based Criteria to Assess Rainfall-Induced Landslides

Critical slopes are appraised with risk and reliability criteria to prioritize the need for attention and resources. Criteria include the random features of both: soil properties and rainfall intensity and duration to calculate the slope annual failure probability. The soil strength is reduced as the rainfall water infiltrates the slope soil and modifies the soil-water characteristic curves. The slope failure is defined as the event where the classical safety factor is less than 1. The acceptable failure probability is assessed from the minimization of the expected life-cycle cost and compared to the slope failure probability to devise policies to prioritize mitigation works. Index Terms - Critical Slopes, Landslides, Rainfall Intensity-Duration, Risk and Reliability Criteria.