Abstract
Soil, or soil structure modulus of deformation, is one of the main design parameters for road engineering and traffic infrastructure design of, for example, highways, railways, runways and embankments. It is also the main soil improvement criterion. When creating any road structure with codified design resistance, one employs structural layers of certain thicknesses and modulus of deformation. Both values need to satisfy the minimum values in accordance with codified requirements. This paper analyzes correlations for the widely applied in engineering practice methods to determine the soil stiffness. The static test methods acknowledged to be exact enough for determining the modulus of deformation for the primary and secondary loadings. As dynamic test methods require significantly less time and financial resources, they are widely accepted in engineering practice. The dynamic methods determine only the dynamic modulus of deformation. Design practice aims to relate it with the static modulus of deformation of the secondary loading. Many countries propose codified correlations, with differing levels of conservatism, to convert the dynamic modulus of deformation into the static one. Developed correlations between the results of the static plate load test and the dynamic plate load tests processed from own test results of different soils are presented and a comparative analysis with other proposed correlations is given.
Highlights
The quality and economical effectiveness of pavement structures of any type of road depends on the rational distribution of the structural parameters of the pavement
This paper examined the static and dynamic plate load in situ tests performed at Technische Universität Darmstadt with various types of soil with the aim to determine deformation moduli for unloadingreloading resistance and the dynamic deformation modulus
The comparative analysis of obtained results performed regarding the correlations of static deformation modulus versus dynamic deformation modulus are presented in different guidelines, specifications, and research papers
Summary
The quality and economical effectiveness of pavement structures of any type of road depends on the rational distribution of the structural parameters of the pavement. Compliance with test results can be verified by solving the analysis problem (mathematical programming methods can be applied as well) introducing the actual parameters (modulus of deformation and heights of structural layers) measured during the construction process of the pavement structure. The dynamic plate load test is recognized as the most rational method (ensuring time and financial savings) to determine the modulus of deformation of the soil layers. The general approach is to apply the dynamic plate load test for determination of the dynamic modulus of deformation and apply the developed correlation with the relevant modulus of deformation processed from the static plate load test results. The current study aims to conduct the static and dynamic plate load test for different soil types and perform suitability analyses of the obtained results against the proposed correlations of the dynamic and static modulus of deformation. Requirements for Evd magnitudes are rarely proposed and investigations in the field last for approximately 20 years, contrary to investigations on characterizing Ev1 and Ev2, which last for several decades
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