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The compression dialog provides information on the relationship between void ratio and net normal stress. This relationship can be determined in the laboratory using a one-dimensional, Ko, compression (or consolidation) oedometer test as described by ASTM D4546. The compression curve generally has similar characteristics to the soil-water characteristic curve. The compression equation forms the basis for the prediction of volume change in a soil (i.e., settlement or swelling).


Material State: The Material State fields contain the initial soil state at the beginning of the compression test. Material state parameters should be specified in terms of Poisson's Ratio, Volumetric Water Content, Void Ratio and Specific Gravity.


Fitting Method: The Fitting Method drop list contains the methods currently implemented in SVSOILS for the fitting of laboratory data using mathematical equations. A description of these methods can be found in the following sections of the SVSOILS Theory Manual.