A Shelby Tube Sampler is a thin-walled 3-inch diameter brass tube that can be used to extrude undisturbed samples that are relatively cohesive and very soft to stiff. The sampler is pushed into the ground at the bottom of an open drill-hole onto relatively undisturbed in situ soil. The in-tact soil can be extruded in the laboratory for testing such as in-place density, consolidation, permeability, triaxial shear, swell testing, and others.
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