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Hydraulic Conductivity of an Isotropically Compressed Soil¹

ABSTRACT

Hydraulic conductivities (K) of disturbed samples of Yolo loam were measured under isotropic confining pressures of from 0.1 to 3.2 kgm/cm² in a triaxial test cell. Solutions of 1, 10, and 100 meq/liter of NaCl or CaCl₂ produced marked differences in K, slight effects on compressibility, and no effect on soil dispersibility. The Kozeny-Carman equation showed the same pattern of failure reported for clays and soils compressed anisotropically, i.e., K declined much more with decreasing porosity than predicted. Hypothetical K versus depth profiles calculated from K versus confining pressure data support a hypothesis that the K decreases with depth reported in texturally homogeneous soils may be attributable to overburden pressure.

¹ Contribution from the Department of Soils & Plant Nutrition, University of California, Berkeley.

² Assistant Professor, UCB, Computer Scientist, US Geological Survey, Menlo Park, Calif.; and Extension Specialist, Oregon State University, Corvallis, respectively.

Received for publication November 14, 1969. Accepted for publication February 9, 1970.