Public test guide

Collapse potential

Checks whether an unsaturated soil may suddenly compress when it becomes wet under load.

Plain-language explanation

What the test tells you.

The project specification controls the exact method and acceptance requirement.

A confined specimen is loaded to the specified stress and then inundated while the additional settlement is measured.

Undisturbed specimen, oedometer, loading frame, water and accurate displacement measurement.

The percentage collapse strain caused by wetting at the selected stress level.

Used to evaluate foundation risk in loose or moisture-sensitive soils and to guide earthworks or foundation treatment.

Typical test sequence

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