The shear test on soil specimens is performed to measure the resistance to shearing of all those specimens subjected to an orthogonal pressure to the plane.
The sample is placed between two porous stones and metal grids inside a sturdy metal box divided into two halves.
Different versions of shear testing machines are available, from the basic version used for teaching purposes with vertical load application through calibrated weights and dial gauges, to the most advanced and high-performing shear testing machine with fully automatic vertical load application.
Shear speed is applied by means of an electric motor and can be set or calculated automatically according to the consolidation obtained.
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