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- W2243377196 abstract "A simple method to use deflection measurements for design of overlay thickness on low-volume gravel roads is described. Deflection values are recorded at the center of a circular loading plate and at a certain distance from the center. By using the theory of elasticity, it has been found that a certain arithmetic function of the two deflections measured varies almost linearly with the subgrade modulus within rather wide limits of thickness and elastic modulus of the gravel layer; the relation is nearly independent of these values. This relation has been confirmed by analysis of a large number of measurements made by the falling-weight deflectometer on a number of gravel road sections. Similarly, a relation for determination of the upper layer thickness in a two-layer system has been found. Determination of the design deflection meets with two problems: variation along the road and variation with season. The effect of variation along the road will be solved by using running averages and that of seasonal variations by applying a weighting factor. For simplification of the design procedure, it has been assumed that there is a constant ratio between the subgrade modulus and the modulus of the gravel layer; this assumption has been confirmed by actual measurements. Analysis of the standard designs prescribed by the Swedish Road Specifications on different subgrades at different traffic intensities has shown a unique relation between vertical subgrade stress and traffic intensity at each subgrade type. The required equivalent overlay thickness may therefore easily be selected and the corresponding overlay thickness of different paving materials determined. A discussion follows regarding the practical problems associated with the measurement procedure, such as length of intervals between measurements, magnitude of load applied, nonlinearity of materials, and seasonal variations. (Author)" @default.
- W2243377196 created "2016-06-24" @default.
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- W2243377196 date "1983-01-01" @default.
- W2243377196 modified "2023-09-23" @default.
- W2243377196 title "SIMPLE OVERLAY DESIGN METHOD FOR GRAVEL ROADS" @default.
- W2243377196 hasPublicationYear "1983" @default.
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