Pile Friction Freeze: A Field and Laboratory Study. Volume 1 of 2

摘要

The objectives of this reseach were to measure the increase in pile friction with211u001etime for various soil conditions in the laboratory and field. Accordingly, five 211u001efully instrumented piles were driven into a variety of soils at four different 211u001eFDOT bridge sites. The five eighteen-inch square piles were instrumented with 211u001estrain gauges, lateral total stress cells, and pore pressure sensors along their 211u001elength, and at their tips were cast Osterberg load cells. This study was the 211u001efirst application of an Osterberg load cell on a prestressed concrete pile to 211u001egenerate ultimate skin friction. In the laboratory, a device was developed to 211u001edrive a model pile in the centrifuge in flight at 50 gs and then perform a static 211u001epull out (tension) test. Also, in the field SPT Torque, piezo CPT, and DMT stage 211u001etesting was performed to estimate the pile freeze with time.