On the use of compliance correction for performing truly constant volume cyclic direct simple shear tests on sands
On the use of compliance correction for performing truly constant volume cyclic direct simple shear tests on sands
The cyclic undrained Direct Simple Shear (DSS) response of sand samples is predominantly influenced by the stiffness of the apparatus. Recent findings have shown that a stiffer apparatus results in a lower cyclic resistance response compared to a more flexible apparatus for which the number of cycles to liquefaction is higher. Consequently, the cyclic response of the sand samples is not only controlled by the soil behaviour itself but by the stiffness of the DSS device. High quality DSS test results on dense sand require a very stiff device that minimizes compliance to ensure truly constant volume (undrained) conditions. In this study, the device compliance is reduced to tolerated limits via actively correcting the vertical displacement response of the system during testing such that the height of the sample remains constant. Cyclic DSS tests on dense sand samples are performed and presented in this study for different compliance correction equations.
Maria Konstadinou; Adam Bezuijen
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
A - New developments on structural design
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