Reliability Analysis of Embankment Reflecting Spatial Variability of Soil Parameters
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초록
The evaluation of embankment stability was performed based on the results from a conventional deterministic analysis and a reliability analysis. The embankment used in the analyses was selected from real sites located at Goryeong area in South Korea. The Bishop simplified method was implemented to calculate driving and resistance moments of the embankment. In the reliability-based design, Gaussian random field theory was used to account for spatial variabilities of soil properties. The results show that the calculated factors of safety (FS) from the conventional deterministic analyses exceeded the minimum FS proposed in design codes. Also, the random field-based reliability analyses revealed that the probability of embankment failure assuming no water table was much lower than the lower bound of the proposed target probability of failure. However, under increasing levels of water table, FS drops and the probability of failure increases significantly.
Abstract
The evaluation of embankment stability was performed based on the results from a conventional deterministic analysis and a reliability analysis. The embankment used in the analyses was selected from real sites located at Goryeong area in South Korea. The Bishop simplified method was implemented to calculate driving and resistance moments of the embankment. In the reliability-based design, Gaussian random field theory was used to account for spatial variabilities of soil properties. The results show that the calculated factors of safety (FS) from the conventional deterministic analyses exceeded the minimum FS proposed in design codes. Also, the random field-based reliability analyses revealed that the probability of embankment failure assuming no water table was much lower than the lower bound of the proposed target probability of failure. However, under increasing levels of water table, FS drops and the probability of failure increases significantly.
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