Shear Mobilization on Laterally Loaded Shafts

by Trevor David Smith, Portland State Univ, Portland, OR, USA,
Brian Ray, Portland State Univ, Portland, OR, USA,

Document Type: Proceeding Paper

Part of: Geotechnical Aspects of Stiff and Hard Clays


From the results of a pressure cell instrumented rigid shaft embedded in stiff clay and subjected to horizontal static loading the side shear mobilization rate, and its contribution to equilibrium, is found. These measurements show that under working load side shear 'drag' on the side of the shaft contributes the majority of mobilized soil resistance. At ultimate load the soil pressures mobilized in front of the shaft contribute most to equilibrium. Measured undrained shear strengths from the unconfined compression test are shown to provide only 70% of the field mobilized side shear required for equilibrium. Measurement of the soil to pile wall adhesion, mobilized down the cast in situ concrete pile wall, is well represented by the vertical soil to soil failure planes initiated in the pressuremeter test.

Subject Headings: Soil pressure | Lateral loads | Soil stress | Soil analysis | Shafts | Static loads | Shear resistance

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