Comparison of pile dynamic and static load tests in clayey deposits of Southwest Iran with special attention on soil setup

    Abstract:  It  is  well  known  that  driven  piles  in  clayey  deposits  typically undergo  a  time-dependent  increase  in  capacity  following  initial installation  due  to  “soil  setup”.  The  static  and  the  dynamic  pile testing  methods  are  the  two  main  types  of  pile  tests  that  are periodically  used  to  assess  the  pile  load  capacity  and  setup measurement.  The  main  objective  of  this  study  is  to  compare  the static and  dynamic load tests results and to evaluate the ability of the High Strain Dynamic Test (HSDT) using CAPWAP method to estimate the static capacity of driven piles and setup measurement. This paper compiles the test results of HSDT and SLT at two piling project sites within clayey deposits of Southwest Iran. Evaluation of the  test  results  indicates  that  shaft  resistance  has  considerably increased over time at the study sites. Examination of the full scale static  load  test  data  and  CAPWAP  analyses  suggested  that  HSDT could provide a suitable tool to assess static driven pile capacities. The  dynamic  load  pile  test,  which  is  a  simple  quality  control  test offering  a  considerable  savings  of  time  and  cost  and  requires  less space,  can  be  used  for  predicting  pile  capacity  and  pile  integrity under proper care and it should be calibrated by static tests.

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