Dynamic plane strain testing as an alternative method to characterise cyclic direct simple shear experiment on sands

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4. Dynamic plane strain testing as an alternative method to characterise cyclic direct simple shear experiment on sands

A numerical investigation on a sand under plane strain condition subjected to a cyclic loading on a shake table has been described to characterise the stress conditions during a cyclic direct simple shear (DSS) experiment. The objective is to develop a reliable plane strain dynamic test facility for soils which can replicate essential dynamic behaviours of a sand observed in a standardized test. A laboratory plane strain cell of dimension 226mm x 146mm x 25mm has been fabricated in-house which is to be mounted on a 5 tonnes capacity uniaxial shake table. The nonlinear dynamic effective stress analyses of the undrained plane strain tests are performed using an advanced constitutive model, PM4Sand and the results are compared with the published results of actual cyclic direct simple shear (DSS) experiments on Ottawa F65 sand in terms of stress-strain behaviour and the effective stress path. It is observed that there is a good qualitative agreement of the stress path obtained from the plane strain dynamic analyses and the cyclic DSS tests. Additional numerical analyses have been conducted using sinusoidal motions of varying amplitude and frequency to gain an insight into the extent of cyclic mobility of a sand with amplitude and frequency.

10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)

4. Geotechnical earthquake engineering