Caltrans Logo

Collapse Potential

Test Method

ASTM Designation: D 5333, “Standard Test Method for Measurement of Collapse Potential of Soils”

Summary of Test Method

This test method covers the determination of the magnitude of one-dimensional collapse that occurs when unsaturated soils are inundated with fluid. The test method consists of placing a soil specimen at natural water content in a consolidometer, applying a predetermined applied vertical stress to the specimen and inundating the specimen with fluid to induce the potential collapse in the soil specimen. The fluid may simulate pore water of the specimen or other field condition as necessary when evaluating collapse potential.

Collapsible soils occur widely in the United States and worldwide. Collapsible soils are typified by low values of dry unit weight and natural water content. Engineering works founded on collapsible soils may be damaged by sudden and often large induced settlements when these soils are saturated after construction. Predicting collapse potential is important to the design of many engineering structures.

Minimum Sample Size

Undisturbed Sample: 1 Tube (1 lb)
Remolded Sample: 2 Canvas Bags (80 lb)

Last Updated September 29, 2005

For Questions or Comments regarding this Web Page,