The Assessment of Chin Method Based on Pile Static and Dynamic Load Test Results

    Abstract:  Driven-pile foundations are frequently used  in industrial projects  in  southwest  lowlands  of  Iran.  Static pile  load  test  to  failure  is  the  ultimate  procedure  available  to  examine  the  capacity  of  piles.  Being expensive and time-consuming, the procedure is often submitted for the application of a load to a certain factor (most often two) times the contemplated design load.  In fact only a proof test is carried out while the ultimate capacity remains unknown. This paper examines the performance of chin’s recommendations on  the  interpretation  of  pile  static  load  test  results.  Also  the  ability  of  this  method  in  predicting  the proportion of shaft capacity is discussed by using static and dynamic load test results.  The sites at which this study was conducted are located on  the southwest of Iran in Khuzestan and Lorestan province.  Case history analyses of 22 load-tested driven piles at four sites are presented.  Chin method gives a very good prediction of ultimate capacity except the cases by plunging failure. The reliability of the Chin prediction improves  when  the  last  measured  gross  movement  approaches  10%  of  the  pile  diameter.  If  head movement exceeds 5% of pile diameter Ultimate capacity predicted by Chin is in the range of 90% to 112% of measured capacity.  The Chin method over predicts significantly the shaft resistance when the load is mainly resisted by the toe; When the shaft capacity is greater than 60%, predicted shaft capacity is in the range of 85% to 120% of the measured value.

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