Classification of Argillaceous Soils and Rocks

by Norbert R. Morgenstern, (M.ASCE), Prof. of Civ. Engrg.; Univ. of Alberta, Edmonton, AB, Canada,
Kurt D. Eigenbrod, Soils Engr.; R.M. Hardy and Assoc., Edmonton, AB, Canada,

Serial Information: Journal of the Geotechnical Engineering Division, 1974, Vol. 100, Issue 10, Pg. 1137-1156

Document Type: Journal Paper

Abstract: A distinction is made between clays and mudstones on the basis of the loss of undrained strength of cylindrical specimens immersed freely in water. Clays are weaker at the outset and lose more of their strength more readily than mudstones. On the basis of the rate of strength reduction a further distinction can be made between hard clays and stiff clays. Many clay-shales fit into the hard-clay category. Index tests based upon the amount and rate of slaking are also presented. The amount of slaking is adequately indicated by the liquid limit. The suggested classification and index tests are supported by substantial experimental data.

Subject Headings: Soil strength | Clays | Stones | Soil classification | Soil loss | Soil water | Water management | Rocks |

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