Subgrade Elastic Moduli Determined from Vibratory Testing of Pavements.
Final rept. Oct 74-Sep 76,
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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A layered elastic theory approach to the calculation of the allowable load-carrying capacity and required overlay thickness of a pavement requires the values of the static elastic moduli of the pavement layers and the subgrade. A method is developed for determining the subgrade Youngs modulus by vibratory nondestructive tests performed on the pavement surface. The response of pavements and subgrades to dynamic loadings is nonlinear, so that a nonlinear dynamic model of pavement response was developed by which the subgrade Youngs modulus can be obtained from the measured dynamic pavement response data. The value of the subgrade Youngs modulus predicted by vibratory nondestructive field tests was checked by laboratory dynamic resilient modulus tests. This was done by developing a nonlinear theory of the dynamic resilient modulus test by which the Youngs modulus of the subgrade soil sample can be extracted from the resilient modulus test data. Author
- Soil Mechanics
- Civil Engineering