The Lateral Capacity of Concrete Piles in stiff clay to dense Sand-PPT Presentation

PPT Presentation

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The study examines whether standard high-strain dynamic pile tests—PDA and CAPWAP—can support estimates of pile lateral load capacity. This matters because designers must verify that piles can resist horizontal loads without structural failure or excessive deflection, while pile–soil interaction is complex.<br /><br />The analysis covered 16 concrete piles in medium-to-stiff clay and dense sand. The database included pile dimensions, axial capacities measured by PDA and CAPWAP, and soil properties from geotechnical reports. Using the L-PILE program and an O’Neill (1984) pile–soil model, the researchers estimated lateral capacity based on critical pile length and allowable pile-head displacement.<br /><br />Results showed that lateral capacity increased in nearly linear relationships with soil cohesion and unit weight. Axial capacity alone had no clear direct relationship with lateral capacity; instead, the ratio of lateral to axial capacity varied nonlinearly with axial load. A multiple nonlinear regression model using axial capacity, soil unit weight, and cohesion achieved an R² of 0.847.<br /><br />The findings indicate that soil conditions along the pile’s critical lateral-deflection length are key to lateral capacity. Across the cases studied, lateral capacity was approximately 5–7.5% of vertical axial capacity, with the ratio depending on pile type, material, and soil layering.

Keywords

pile lateral load capacity

dynamic pile testing

PDA

CAPWAP

pile-soil interaction

lateral capacity

axial capacity

concrete piles

clay and sand soils

nonlinear regression