The field vane test enables the direct measurement of the undrained shear resistance of saturated cohesive soils. It can be carried out either in the field, on the wall or at the bottom of an excavation, or even in a laboratory on a suitably contained specimen.

The test consists of forcing a vane with four orthogonal blades into the soil, and then rotating it until soil failure, measuring the maximum torque value required to generate this. Afterwards the residual shear strength of the soil after significant deformation can be measured by continuing to rotate the vane several turns until the soil is completely mixed.

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