Pore Pressure Effects in Borehole Shear Testing

by Alan J. Lutenegger, Clarkson Univ, Potsdam, NY, USA,
Kevin F. Tierney, Clarkson Univ, Potsdam, NY, USA,

Document Type: Proceeding Paper

Part of: Use of In Situ Tests in Geotechnical Engineering

Abstract: The effects of excess pore pressures on shear strength results obtained using the Borehole Shear Test (BST) were investigated. Pore pressures were measured during the consolidation, shear, and post-shear phases of the test for both stage testing and fresh shear testing. Results indicate that in the clays tested, higher pore pressures were generated during fresh shearing. A consolidation time of 20 minutes was necessary to dissipate excess pore pressures. Pore pressures measured during shearing were used to obtain effective shear strength parameters.

Subject Headings: Shear tests | Shear strength | Pore pressure | Soil pressure | Shear stress | Consolidated soils | Boring | Pressure measurement

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