In Situ Tests with Ko Stepped Blade

by Alan J. Lutenegger, Clarkson Univ, Potsdam, NY, USA,
David A. Timian, Clarkson Univ, Potsdam, NY, USA,

Document Type: Proceeding Paper

Part of: Use of In Situ Tests in Geotechnical Engineering


The results of field tests conducted using the K//o Stepped Blade to determine lateral stresses and other geotechnical properties are presented. The sites tested represent a wide range of cohesive soils including sensitive marine clay, alluvial clay, eolian silt, and overconsolidated gumbotil. Results indicate that K//o values obtained in soft to medium consistency clays compare reasonably well with other insitu and laboratory estimates of K//o, however in overconsolidated soils, the K//o Stepped Blade results appear unreasonably high. The role of pore pressures generated during testing needs to be addressed if the Stepped Blade is to become a practical tool for geotechnical investigations.

Subject Headings: Lateral stress | Field tests | Soil stress | Soil properties | Soil pressure | Clays | Material properties

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