Abstract
Skin friction acting on cast-in-place concrete piles is studied, which go through clayey soil strata to bearing strata. In loading tests, clayey soils deform under undrained condition, on the other hand, under actual structures, when loads are sustained long enough for consolidation, the soil deforms under drained condition. Influence of the different drainage conditions on skin friction is studied by numerical experiments and it is found that influence is not negligible when piles are fairly long, which indicates it necessary to examine further whether it is correct to evaluate skin friction for pile design based only on pile loading test results
