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Here, the soil is allowed to swell under a series of different vertical pressures (typically including the estimated overburden pressure). The engineer records the percent swell at each load. This method helps predict how much a foundation will heave under a specific structural load. Astm D4546-21 Pdf
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Swell: An increase in volume (vertical deformation) of a soil due to wetting under a constant applied load.
Collapse (Hydrocompression): A sudden decrease in volume (vertical deformation) of a soil due to wetting, typically occurring in dry, loose, silty sands or low-density clays.
One-Dimensional: The test restricts expansion or settlement to the vertical axis (using a consolidometer or oedometer cell), simulating field conditions where horizontal movement is constrained.
Risk Mitigation:
Provides the data needed to design remediation strategies, such as soil stabilization, moisture barriers, or over-excavation. ASTM D4546-21 Here is the text you can
