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The Effect of Drying on Soil Strength Parameters¹

ABSTRACT

The influence of drying on the magnitudes of soil strength parameters C and was determined for three cohesive soils. Shear strength measurements were made using a modified laboratory triaxial apparatus for three different soil types on samples prepared in the laboratory. All samples of a given soil type were molded at the same soil water content and to the same bulk density. Samples were dried slowly to soil water contents between the 1/3-bar soil water suction level and air dryness.

The criterion used to determine shear was either the development of a definite failure plane or an increase in sample diameter of 0.25 mm (0.010 in), whichever occurred first. Volume change of the sample and the applied axial and radial stresses were measured and recorded continuously throughout a test cycle. Mohr's circles were constructed and the parameters C and were determined for all samples. The parameters C and both increased with drying for these soils. Additional studies will be necessary to completely describe the soil shear strength-drying relationship, or to determine the mechanisms of action which prevail.

¹ Contribution from the Soil and Water Conservation Research Division, ARS, USDA, in cooperation with the National Tillage Machinery Lab., USDA, and the Department of Agricultural Engineering, Auburn University, Auburn, Ala. Received Jan. 16, 1969. Approved April 29, 1969.

² Graduate research assistant, Department of Biological and Agricultural Engineering, North Carolina State University at Raleigh, and Research Soil Scientist, National Tillage Machinery Laboratory, USDA, Auburn, Ala. The senior author was formerly Agricultural Engineer, USDA, SWCRD, Auburn University, Auburn, Ala.

Received for publication January 16, 1969. Accepted for publication April 29, 1969.