Public test guide

Triaxial testing

Loads a cylindrical soil specimen under controlled confining pressure to measure its strength and deformation.

Plain-language explanation

What the test tells you.

The project specification controls the exact method and acceptance requirement.

The specimen is enclosed in a membrane inside a pressure cell, then loaded axially under the required drainage condition.

Prepared or undisturbed cylindrical specimen, triaxial cell, pressure system, load frame and displacement measurement.

Stress-strain response and soil shear-strength parameters for the specified test condition.

Provides design inputs for foundations, slopes, retaining works and other problems where soil strength under confinement matters.

Typical test sequence

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