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Volume 43, Issue 1 (January 2020)
On the Influence of Multiple Polarization Changes on the Cumulative Deformations in Sand Under Drained High-Cyclic Loading
(Received 31 August 2017; accepted 6 December 2018)
Published Online: 2020
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The effect of multiple changes of the polarization (i.e., direction) of a drained cyclic loading has been studied in about 50 triaxial tests with simultaneous harmonic oscillation of the axial and lateral stresses. A fine sand has been tested at various initial densities. Starting from the same average stress in all the tests, six different polarizations of the cycles have been applied by choosing different amplitudes and phase shifts between the axial and lateral stress components. In each test, at least 10,000 cycles have been applied. The polarization has been changed every 1,000, 2,500 or 5,000 cycles. The sequence of the polarizations has been varied from test to test. Several reference tests without polarization changes have also been performed. The test results reveal that the first change of the polarization usually leads to a temporary increase of the rate of strain accumulation. This increase depends on the angle between the subsequent polarizations, while the correlation with the density or number of cycles applied prior to the polarization change is poor. All further polarization changes have only a minor effect on the rate of strain accumulation. Consequently, the final residual strain after 10,000 cycles is only moderately increased by the multiple polarization changes. The consequences of these experimental results for a high-cycle accumulation model describing the cumulative deformations in sand under a high-cyclic loading are briefly addressed.
Department of Geotechnical Engineering, Bauhaus-Universität Weimar, Weimar,
Institute of Soil Mechanics and Rock Mechanics, Karlsruhe Institute of Technology, Karlsruhe,
Stock #: GTJ20170298
Title On the Influence of Multiple Polarization Changes on the Cumulative Deformations in Sand Under Drained High-Cyclic Loading