Behavior and Performance of Instrumented Barrette Piles in Bangkok Subsoils

The behavior and performance of barrette piles in Bangkok subsoil has been evaluated based on the data of test barrette piles with full instrumentation of vibrating wire strain gauges and mechanical extensometers. The skin friction and end bearing capacity of tested piles were separated according to load transfer phenomena. The skin friction factors α and β values as well as end bearing coefficient, N_q of barrette piles were compared with those of bored piles of tip level in various soil condition as well as with and without applied base grouting. The skin friction factors α and β of barrette pile were found to be more or less the same as bored piles. The N_q of barrette pile, however was much less than that of bored piles. The differences in plane strain effects on the skin friction between narrow side and wide side of barrette piles are limited.