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Soil Science Society of America Journal Abstract -

A General Soil Volume Change Equation: II. Effect of Load Pressure1


This article in SSSAJ

  1. Vol. 47 No. 3, p. 422-425
    Received: Mar 25, 1982
    Accepted: Nov 17, 1982

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  1. Juan V. Giráldez and
  2. Garrison Sposito2



The two-parameter model of soil volume change developed by the authors is extended to account for the load pressure effects expected in the upper 2 m of a soil profile. The extended model equation is based on two principal assumptions: (i) that only the dry soil pore volume and the air-entry water content are affected significantly by changes in load pressure, and (ii) that changes in the dry soil pore volume with load pressure are proportional. These assumptions require only one additional adjustable parameter in the extended model, the soil bulk modulus. The extended model describes available data on soil volume change under load pressure very well.

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