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


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 | Boring | Water pressure

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