Abstract

Displacement factor was proposed to use in calculation of additional modulus of subgrade reaction. The moduli are used in designing the Nailed-slab Pavement System. A curve of displacement factor was proposed by Puri for soft clay, and the inverse one was recommended by Hardiyatmo for stiff clay. This paper is aimed to develop displacement factor for stiff clay based on Hardiyatmo data and compared to Puri’s curve. Results show that there is no significant differentiation of displacement factor between both clay consistencies. It can be concluded that the curve of displacement factor for soft clay from Puri’s curve can be used for stiff clay.