ISSN: 1945-7545
CODEN: GTJODJ
Page Count: 12

Screw Plate Insertion in Sand

Brown, PT
Research associate, Geotechnical Engineering, School of Civil and Mining Engineering, University of Sydney,

Abstract

Laboratory measurements of the depth of penetration at the end of each revolution of a 30-mm-diameter screw plate were made when the insertion was carried out with no vertical thrust applied to the screw plate. The tests were carried out to a depth of 150 mm in a dry, uniformly graded sand with a wide range of densities and two values of surcharge pressure. The results showed that, except for sand with a relative density less than about 30%, the penetration per revolution decreases significantly with increasing depth and decreases more rapidly as the density increases. After insertion, loading tests were carried out using the screw plate; the results show a large increase in apparent modulus at the higher values of density. Measurements of elastic modulus were also made when the screw plate was inserted under the control of a threaded rod having the same pitch as the screw plate and with a flat disk buried in the sand.

Keywords:
creep, in situ tests, laboratory tests, Young's modulus, sand, screw plates

Paper ID: GTJ10326J
DOI: 10.1520/GTJ10326J
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