Abstract
Introduction. Deep foundations are widely used as common foundations for construction work in Indonesia. The axial compression capacity of deep foundations or simply we called it pile, consist of friction and end-bearing. Materials and methods. Many formulas used to predict the capacity, and yet the behavior better achieved from instrumented static compression test pile. Results. This paper shown a load transfer behavior for bored pile with diameter of 120-cm with effective length of 30-m constructed in very soft to stiff clay soil with its toe seated in very dense sand. Conclusions. Result showed that long piles capacity in soft to medium clay dominantly resist by its friction under small displacement (<0.7 % diameter), while the end-bearing fully mobilized under higher displacement (>10 % diameter).