ESTIMATION OF RELATIONS BETWEEN POINT BEARING LOADS AND SETTLEMENTS OF BORED PRECAST PILES USING SOIL BORING LOG INFORMATIONS

Abstract

A new estimation method is proposed for the relationship of the point bearing loads and point settlements of bored precast piles installed in sandy supporting strata by preboring or inner excavation. The method is derived using analyses by finite element method, back-analyses by neural network and regression analyses. The piles have widened holes at the pile points which are filled with cement milk. Nomographs are prepred and, if the diameter of the widened part, embedded length of the part into the supporting stratum, N-value and effective overburden pressure on the surface of the stratum are given, we can estimate the relations by manual calculation.