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Geological Society, London, Engineering Geology Special Publications
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Geological Society, London, Engineering Geology Special Publications; 1990; v. 6; p. 137-143;
DOI: 10.1144/GSL.ENG.1990.006.01.15
© 1990 Geological Society of London

Session 4: Penetration Testing: The Standard Penetration Test

Field tests on pavement foundations

A. R. Dawson1 & N. H. Thom2

1 Department of Civil Engineering, University of Nottingham, Nottingham, NG7 2RD, UK
2 SWK Pavement Engineering, Highfields Science Park, Nottingham, NG7 2QP, UK

Generally the California Bearing Ratio (CBR) is used to quantify the properties of subgrades for use in pavement design. In the last few years, a wide variety of less familiar, but potentially more useful, tests has been developed. This paper describes some trials in which the results of Dynamic Cone Penetrometer, Clegg Hammer and Falling Weight Deflectometer tests are compared. Comparisons with the output of an instrumented vibrating roller and Plate Bearing Test results are also made.

The practical problems of relating the collected information to the engineering properties (particularly stiffness) of the soil are discussed and some tentative proposals for dealing with these problems are put forward.