EXCESS PORE WATER PRESSURE ACCUMULATION AND RECOMPRESSION OF SATURATED SOFT CLAY SUBJECTED TO UNI-DIRECTIONAL AND MULTI-DIRECTIONAL CYCLIC SIMPLE SHEARS

This paper is to investigate the effect of cyclic shear direction (or phase difference) on the accumulation of excess pore water pressure during cyclic shear and on the recompression after cyclic shear. Several series of uni-directional and multi-directional cyclic simple shear tests under undrained...

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Bibliographic Details
Published inJournal of earthquake and tsunami Vol. 7; no. 4; p. 1250027
Main Authors MATSUDA, HIROSHI, NHAN, TRAN THANH, ISHIKURA, RYOHEI
Format Journal Article
LanguageEnglish
Published Hackensack World Scientific Publishing Company 01.11.2013
World Scientific Publishing Co. Pte., Ltd
Subjects
Accumulation
Amplitude
Amplitudes
Clay
Compressing
Cycles
Direction
Hydrostatic pressure
Kaolin
Phase shift
Pore pressure
Pore water
Pore water pressure
Shear
Shear strain
Shear tests
Shears
Simple shear tests
Soft clay
Void ratio
Water pressure
Cyclic simple shear
undrained
clay
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Summary:This paper is to investigate the effect of cyclic shear direction (or phase difference) on the accumulation of excess pore water pressure during cyclic shear and on the recompression after cyclic shear. Several series of uni-directional and multi-directional cyclic simple shear tests under undrained condition were carried out for normally consolidated Kaolin. From the test results it is shown that the accumulation of pore water pressure and the post-cyclic settlement increase with the shear strain amplitude and the phase difference. The values of the shear strain amplitude at which the effect of cyclic shear direction is most significant, decrease with the increase of the number of cycles. The change of the void ratio in the recompression stage increases approximately in proportion to the logarithm of the stress reduction ratio and is not affected by the shear strain amplitude. For multi-directional cyclic shear, this change of the void ratio depends on the phase difference and the number of cycles. The cyclic recompression indices in the recompression stage were obtained for uni-directional and multi-directional cyclic shears. The cyclic shear induced settlement can be calculated by using these indices.
ISSN:1793-4311
1793-7116
DOI:10.1142/S1793431112500273