Transcription of Dynamic Pile Testing - piledrivers.org
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Dynamic Pile Testing - piledrivers.org
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 pile TestingLoad is appliedby impacting ramLoad is measured bystrain transducersMeasurement
8 FMX, CSX Strain transducer Force (Stress) Maximum at gage location FMX = av EA; CSX = av E FMX: Ensure that sufficient force is applied to mobilize resistance CSX: Ensure safe pile top stress –
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