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Quarterly Journal of Engineering Geology & Hydrogeology

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Large diameter plate tests on weathered in-situ Chalk

^{1 1}University of Surrey, UK (e-mail: m.matthews@surrey.ac.uk)
^{2 2}University of Southampton, UK

The prediction of the settlements of spreadfoundations on in-situ chalk is best carried out using empirical methods, based on the simple behavioural model developed by Burland & Lord (1970) using results from plate tests. However, the data available to support this approach remain somewhat limited, stratigraphically, geographically and in terms of size and level of loading. This paper reports the results of nine large (1.8 m) diameter plate tests carried out on three weathered chalks with widely different intact densities and strengths. The results are interpreted in terms of the Burland and Lord model, and despite the differences in the chalks at these sites, are found to be broadly in agreement with the parameters deduced on the basisof the pioneering work carried out at Mundford by Wardet al. (1968). In addition the paper provides someadditional data on creep settlements, confirming that the long-term settlements on chalk can be considerably larger than those predicted on the basis of short-term loading tests.

Key Words: Chalk • in-situ tests • plate-bearing tests • stiffness • weak rocks