Application of the Light Falling Weight Deflectometer (LFWD) to Test Aggregate Layers on Geosynthetic Base

The article presents an analysis of the results of research on aggregate layers placed on weak soil reinforced with geosynthetic conducted by using Light Falling Weight Deflectometer (LFWD). Measurements of geotechnical parameters have been carried out on the test bench in the laboratory. The tested subgrade comprised of layers: a reinforcement in the form of non-woven geotextile was laid on a layer of a weak soil subgrade, and then the geosynthetic was embedded with a crushed-stone aggregate. A weak subgrade was modeled by using various number of plastic sheets. Tests results were involved statistical analysis, obtained regression models of dependent variables E1, E2 demonstrate high prediction capability; relative error in predicting of models is ± 25%. It was not, however, possible to obtain Is models, useful in engineering practice and based on results from Light Falling Weight Deflectometer tests.