MEASURED AND PREDICTED LOADS IN MULTI-ANCHOR REINFORCED SOIL WALLS IN JAPAN

概要

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More than 3000 multi-anchor walls have been built in Japan over the last decade. The paper briefly reviews a total of eight instrumented wall sections that can be used to estimate anchor loads at the end of construction. Measured loads are compared to predicted values using equations found in current design guidelines. The comparison shows that the current Japanese and UK design methods to compute anchor loads are reasonably accurate for walls with frictional backfills provided K_a is calculated using the Rankine equation. For walls with cohesive-frictional backfills, current design methods over-predict anchor loads by as much as a factor of two. The eccentricity term in current UK and Hong Kong design methods is shown to not improve the accuracy of load predictions and it is recommended that this additional complexity be removed from these equations. A new load equation is proposed and constant coefficients are back-fitted to measured anchor load data. The new method is demonstrated to give quantitatively better predictions of anchor loads based on the statistics for load bias values computed as the ratio of measured to predicted anchor loads at the end of construction.