Abstract
The quasi-static Light Falling Weight Deflectometer (LFWD) load test has been developed to directly estimate the modulus of a near surface profile. This paper considers the use of the LFWD as a geotechnical investigation and site profiling tool of near-surface profiles. The suitability of using the LFWD as such is discussed by comparison of the insitu modulus (E-LFWD) determined by the LFWD with the results of Dynamic Cone Penetrometer (DCP) testing at three sites in South East Queensland, Australia. Analysis of the side-by-side testing indicates that the results of each test are related and thus the DCP penetration rate can be used to directly estimate the insitu modulus. This is confirmed by FEM modeling of the LFWD test in which a profile's response to the dynamic loading was found to vary over the identified zone of influence.
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