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Vertical Behavior of Two 16-Year Old Drilled Shafts

by L. D. Johnson, US Army Engineer Waterways, Experiment Station, Vicksburg, MS, USA,
W. R. Stroman, US Army Engineer Waterways, Experiment Station, Vicksburg, MS, USA,



Document Type: Proceeding Paper

Part of: Analysis and Design of Pile Foundations

Abstract:

Vertical load tests were performed on drilled shafts subject to lateral confining and heaving pressures from expansive soil over 16 years. Results indicated mobilized skin friction equal to the maximum soil shear strength. Lateral earth pressures on the shafts were about 3 times the vertical pressure. End bearing capacity was reduced because of long-term wetting and soil softening beneath the shaft base.

Subject Headings: Soil water | Expansive soils | Soil-structure interaction | Soil-pile interaction | Soft soils | Vertical loads | Shear strength

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