Dynamic Pile Testing

1 Dynamic pile TestingASTM D4945 pile Driving Analyzer Dynamic pile TestingASTM D4945 pile Driving Analyzer Garland Likins, pile dynamics , PDCA Professor s InstituteGarland Likins, pile dynamics , PDCA Professor s InstitutePublic assured of safe foundation (bridges, buildings, etc.)We spend lots of money - $4B. Remediation is very expensive !Reduce the risk Optimize foundation -reduce costWhy test driven piles?Driven piles are tested more often than any other foundationMore safe, less risk, less costStatic Analysis Methods Residual (saprolitic) granite soils: fine to medium silty sand with low plasticityInternational Prediction Event Behaviour of Bored, CFA, and Driven Piles in Residual Soil , ISC 2 Experimental Site, 2003, by Viana da Fonseca and Santos 2QA Inspection: Piles always have a blow count criteriaQA Inspection: Piles always have a blow count criteriaWave Equation AnalysisWave Equation AnalysisBut wave equation contains assumptions of hammer performance & Dynamic soil behaviorMotion is measured by accelerometersstraingageF(t)acceleromete rv(t) Dynamic pile TestingDynamic Pil

7 Net measured energy transfer (steel piles) 0% 20% 40% 60% 80% 100% 20% cabled drop hammers 80% 30% diesel hammers 60% 40% air hammers 70% 60% hydraulic drop hammers 100% Efficiencies on concrete piles are lower ~ 10% Hammer Performance

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  Testing, Dynamics, Pile, Dynamic pile testing

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