Use of technology in the application of helical piles or anchors-PPT Presentation

PPT Presentation

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The study evaluates how risk analysis and quality control can improve the design of high-capacity Continuous Flight Auger (CFA) piles. It examines a 1.2 m diameter pile initially designed for an allowable load of 6,000 kN, using SPT-based capacity estimates and three bidirectional static load tests to assess shaft friction and end-bearing resistance.<br /><br />The results indicate that shaft friction is comparatively consistent, while end-bearing resistance is substantially more variable and sensitive to construction conditions. Because end bearing contributes less reliably to performance, the authors recommend that shaft resistance exceed the allowable load (PL/Padm > 1.0). Bidirectional testing provides direct evidence of how load is transferred between the shaft and pile base, helping validate design calculations and reduce uncertainty.<br /><br />Based on the test results, the authors consider an allowable load of 7,500 kN feasible, provided the pile length is increased by approximately 3 m. This illustrates how site-specific testing and risk-based analysis can support more efficient designs without relying solely on conservative assumptions. The study recommends combining risk analysis with bidirectional load testing, particularly for complex or high-capacity foundations, to improve confidence in pile performance while potentially reducing construction costs.

Keywords

Continuous Flight Auger

CFA piles

risk analysis

quality control

bidirectional static load tests

shaft friction

end-bearing resistance

pile capacity

SPT-based estimates

foundation design