GDS have a unique system for testing large samples without the use of a triaxial cell. The unsaturated sample is prepared within a specially designed compaction mould, before effective stress is applied to the sample by means of a GDS vacuum controller, which can accurately apply negative pressure between atmospheric pressure (0kPa) and -75kPa, depending on the source vacuum pump being used. This allows the sample to be consolidated with negative pore pressure and confining pressure at atmospheric.
HLF
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