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Title: Back-calculation of parameters for slab on two-layer foundation system
Authors: Shuo, L.
Fwa, T.F. 
Tan, K.H. 
Issue Date: Nov-1997
Citation: Shuo, L.,Fwa, T.F.,Tan, K.H. (1997-11). Back-calculation of parameters for slab on two-layer foundation system. Journal of Transportation Engineering 123 (6) : 484-488. ScholarBank@NUS Repository.
Abstract: Most highway and airport rigid pavements constructed today consist of a subbase layer, giving rise to a system of a concrete slab supported on a two-layer foundation. This paper makes use of the solution of a slab on a two-layer system to derive a closed-form procedure for back-calculation analysis of pavement parameters A computer program called NUS-DEF3 to solve for surface deflections is developed as a subroutine in the back-calculation analysis. The algorithm for the closed-form back-calculation of this system is presented This algorithm reduces a system of three equations with three unknowns to one single nonlinear equation. It differs from the convention approach of searching for the best solution iteratively by means of the least-squares method and gives unique closed-form solutions without the need to select an initial modulus to start with. Solutions to numerical examples of three typical slab-on-two-layer-foundation problems are presented.
Source Title: Journal of Transportation Engineering
ISSN: 0733947X
Appears in Collections:Staff Publications

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