Behavior of Single Mineral Soils in Triaxial Shear

by Robert M. Koerner, (M.ASCE), Asst. Prof. of Civ. Engrg. and Mech.; Drexel Univ., Philadelphia, PA,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1970, Vol. 96, Issue 4, Pg. 1373-1390

Document Type: Journal Paper


Quartz, feldspar, calcite, chlorite and mica soil samples are laboratory-prepared, characterized on the basis of their physical properties and tested in triaxial shear. Saturated and air-equilibrated dry tests are performed on all samples. The drained triaxial test results are modified to account for dilatation and compared with values obtained from undrained-pore pressure tests. The analysis due to Ladanyi shows good agreement for such a dilatation correction. These values are then mineralogically compared: (1) On the basis of relative density at failure; (2) by Rowe's stress-dilatancy theory; and (3) on the basis of physical (solid) friction. The flaky (plately) soil samples consisting of chlorite and mica behave quite differently from other soil types. Previously published values of physical friction as obtained from direct shear type tests seem questionable. Quartz soils show slightly greater strength when saturated while all other soils show greater dry strengths.

Subject Headings: Triaxial tests | Shear tests | Soil strength | Saturated soils | Minerals | Triaxial loads | Soil analysis | Friction

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