Probabilistic assessment of inner slope stability in dikes
Gaining insight in the difference between the semi-probabilistic and probabilistic estimates of the reliability index for inner slope stability with overtopping
C. Broman (TU Delft - Civil Engineering & Geosciences)
M. Kok – Mentor (TU Delft - Civil Engineering & Geosciences)
C. Mai Van – Graduation committee member (TU Delft - Civil Engineering & Geosciences)
M. Korff – Graduation committee member (Geo-engineering)
A. Broere – Graduation committee member (WSP)
M. van der Krogt – Graduation committee member (Deltares)
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Abstract
After overtopping, the most common failure mechanism in the world that leads to a dike breach is the instability of the inner slope. Two stability calculations are required for the semi-probabilistic assessment of inner slope stability. One calculation is without significant overtopping and the other calculation is with significant overtopping whereby the dike is saturated. The semi-probabilistic assessment method with overtopping is prescribed in a KPR factsheet, but is not verified by calibration calculations or probabilistic calculations. After performing semi-probabilistic and probabilistic calculations at Jaarsveld-Vreeswijk (JAV) in the Netherlands, there is an inconsistency between the semi-probabilistic and probabilistic estimates of the reliability index for inner slope stability with overtopping. Semi-probabilistic and probabilistic calculations have been performed to gain more insight in the inconsistency between the semi-probabilistic and probabilistic estimates of the reliability index for inner slope stability with overtopping. Based on the results, it is recommended to perform a calibration study for inner slope stability with overtopping to obtain a better estimate of the failure probability based on semi-probabilistic calculations.