ISSN: 1945-7545
CODEN: GTJODJ
Page Count: 10

Undrained Deformability and Strength Characteristics of Soft Bangkok Clay By the Screw Plate Test

Bergado, DT
Associate professor of geotechnical engineering, Asian Institute of Technology, Bangkok,

Huan, NM
Master of engineering graduate, Division of Geotechnical and Transportation Engineering, Asian Institute of Technology, Bangkok,

Abstract

Eighteen screw plate tests were carried out using 10-in. 25.4-cm diameter plate, and three types of laboratory test were performed, namely, 18 unconfined tests, 31 unconsolidated-undrained triaxial tests, and 18 one-dimensional consolidation tests. The sampling and testing were carried out at three sites inside the campus of the Asian Institute of Technology in the soft clay layer. At each site, six screw plate tests were performed at depths of 2.50, 4.50, and 6.00 m, and three boreholes were made to take 60-cm-long Shelby tube samples at the test levels. The screw plate test results were calibrated with unconsolidated-undrained (UU) triaxial test results and the bearing capacity factor N_c was found to be 11.00 while the undrained modulus factor K was found to be 0.61. The screw plate test results were also correlated with the unconfined compression (UC) test and one-dimensional consolidation test in this study as well as with the vane shear test and pressuremeter test results from previous investigations. Furthermore, the pressuremeter-settlement-time relationship was evaluated, and it was found that the logarithm of settlement rate, log s, decreased linearly with the logarithm of time, log t, and increased linearly with the logarithm of the stress level, log P′.

Keywords:
clays, screw plate tests, pressuremeter tests, unconfined compression tests, unconsolidated-undrained triaxial tests, consolidation tests, undrained shear strength, undrained modulus, marine clays, bearing capacity

Paper ID: GTJ10943J
DOI: 10.1520/GTJ10943J
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