Stability of Cut Slopes in Volcanic Cohesive Soils

概要

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An example of the investigation of a long term failure of a cut slope was discussed by the photographic records, stability analysis and the results of laboratory tests. The cut slope failure took place in 1979 in Kanto Loam Layer at Yaen Pass on Metropolitan Route 160,excavated at 18 months earlier. Since the failure occured without any apparent change in external loading, it can been considered to be the result of a rapid rise of watertable due to the heavy rainfall accompanied with the typhoon Number 20 and the decrease in cohesion c' due to the stress reduction in the ground. Stability analysis in terms of effective stress and laboratory studies were carried out to understand the mechanism of the drop in c'. It was confirmed that the special account has to be taken of the reduction for the value of c' in overconsolidated volcanic cohesive soil. It may be concluded that for cut slopes in volcanic cohesive soil, it appears necessary to use c'=0 in the effective stress analysis for long term failures and the use of total stress methods is to be avoided except for end of construction conditions.
東海大学の論文