This system features a closed-loop digital servo-control of the shear and normal loads for test automation. Stresses or strains for both the shear and normal actuators can be prescribed to automatically perform conventional simple shear tests as well as cycle dynamic tests, such as liquefaction or cyclic strength.
A high-precision vertical deformation sensor is included to perform liquefaction tests on dry sands by specifying a zero vertical deformation during cyclic shear loads. The electrohydraulic loading system for both the normal and shear load actuators can apply or maintain the prescribed loads or deformations with very small compliance.
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