Vol 8, No 1 (2017) > Civil Engineering >

Developing Curve of Displacement Factor for Determination of Additional Modulus of Subgrade Reaction on Nailed-slab Pavement System

Anas Puri

 

Abstract: The
pavement of the nailed-slab system has been proposed as an
alternative solution for addressing the rigid pavement problem in soft soils.
This system is used for developing a rigid pavement. The simple method of using an equivalent modulus of subgrade reaction (k’) in nailed-slab system analysis was
proposed by a previous researcher. This modulus consists of the modulus of subgrade reaction from a plate load test
(k) and an additional modulus of
subgrade reaction due to pile installing (Dk). The
additional modulus of subgrade reaction has been proposed by some authors. The
displacement factor was used in determining the additional modulus of subgrade
reaction. This factor is difficult to define. In this research, the prototype
test of a nailed slab with single-pile installation was conducted to learn the
validation of the theory of the additional modulus of subgrade reaction on a
full-scale dimension. The prototype was constructed on soft clay, and the
connection between the pile and slab was perfect monolithically. This system
was loaded by centric load. A new curve of the displacement factor is proposed.
Calculated deflections based on this
curve were compared to the observed deflection and
resulted in good agreement with the observation. Hence, it can be used in preliminary design.
Keywords: Displacement factor; Nailed-slab system; Rigid pavement; Soft clay; Subgrade modulus

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