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Mining Publication: Shear Strength Evaluation of Clay-Rock Mixtures

NOTE: This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.

Original creation date: January 2000

Image of publication Shear Strength Evaluation of Clay-Rock Mixtures

At present, there is little knowledge concerning the shear strength of clays containing floating rock particles with concentrations from 0 to 30%. In practice, the effect of rock particles is typically disregarded in shear strength analysis. The two primary reasons for this are: 1) a lack of agreement concerning the influence of rock particles on material strength, and 2) the expense and difficulty of testing clay-rock mixtures with existing laboratory procedures. These factors have impeded the development of successful slope remediation design techniques for colluvium derived from resistant sedimentary rocks or spoil produced from surface mining. This study reviewed 31 technical papers which contain analysis of shear strengths for clay and sands with varying mixtures of rock particles. These technical papers, published over the last 40 years, are comprised of field case studies, laboratory investigations, and theoretical analysis. Evaluation of this body of knowledge has shown that the shear strength gradually increases with increasing percentages of floating particles in unsaturated clays.

Authors: AT Iannacchione, LE Vallejo

Conference Paper - January 2000

NIOSHTIC2 Number: 20020960

Slope Stability 2000. Geotechnical Special Publication No. 101, Griffiths DV, Fenton GA, Martin TR, eds., Reston, VA: American Society of Civil Engineers, 2000 Jan; :209-223