Time effect of bearing capacity of plastic tube cast-in-place concrete piles

Based on the installation mechanism of plastic tube cast-in-place concrete piles (TC pile), the method for time effect of bearing capacity of TC pile was established by employing both of the theories of cylindrical cavity expansion and contraction and radial consolidation. According to the field tests, the rationality of the time-effect theory for TC pile was comparatively studied. The results show that the calculated values of bearing capacities with time by considering the contraction of soils surrounding the TC pile shaft are consistent with the measured ones. However, the calculated values in different rest periods will be overestimated by 160%~300% compared with the measured ones as the contraction of soils is ignored.