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Influence of Physical and Mineralogical Properties on Swelling of Soils in Yolo County, California¹

ABSTRACT

Surface samples from 16 California soils with a wide range of swelling characteristics were studied. The coefficient of linear extensibility (COLE) of each soil was correlated with other properties. Total clay content was highly correlated with COLE (r² = 0.868) while the ratio of expandable clay/total clay (partial r² = 0.454) also significantly affects swelling. The percent of expandable clay is the single variable best correlated with COLE (r² = 0.907). Models established to predict COLE from other soil properties were selected from the literature and applied to these soils. Results are compared with measured COLE values, and a new model calculating COLE from interlayer expansion of the smectite fraction of soil is proposed.

¹ Contribution from the Dep. of Land, Air, and Water Resources: Soils and Plant Nutrition Section. Univ. of California, Davis.

² Research Associate, Dep. of Animal and Range Sciences, Reclamation Research Division, Montana State Univ., Bozeman, MT 59715; and Assistant Professor, Dep. of Land, Air, and Water Resources, Soils Division, Univ. of California, Davis, CA 95616.

Received for publication December 22, 1975. Accepted for publication March 11, 1976.

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