Back-analyses of steel pile driving records for quality assurance

摘要

Steel piles are driven, in many cases, deeper than the SPT borings. To improve confidence in bearing capacity estimation for piles with penetration exceeding boring depth, steel pile driving records were back-analysed by the wave equation and the Danish formula. A comparison of the results by both methods is presented. Only those data including piles driven to penetrations shorter than SPT boring depth and located no farther than 5 metres from the SPT were selected. A good correlation between the driving resistance evaluated by the wave equation and the Danish formula was found. The authors then assured the confidence of the Danish formula for steel piles with characteristics within the range of the data base.