Author(s)

W.H. Cogill

Abstract

Field measurements on layered structures W.H. CogiH Department of Geotechnical Engineering, University of New South Wales, Kensington, New South Wales, Australia, 2033 ABSTRACT The problem is to determine the properties of the component materials of a layered structure, such as a pavement, without resorting to excavation. The information is needed in order (1) to design the thicknesses of the constructed layers in such a manner that the imported materials are strained only to within acceptable limits, and (2) to locate and to characterise zones of weakness in existing pavements. It is convenient to perform measurements at the surface of wave velocities or of deflections in the neighbourhood of a known load. The properties of the surface amd the subsurface materials can then be determined by the application of inverse methods to the results. Results of measurements of both types are presented and analysed. INTRODUCTION The life of a pavement depend

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