Abstract:
Model screw piles of different geometry and dimension
are installed in uniform density granular sand beds by application
of torque at pile head. On installation the piles are
subjected to uplift load. Devices are fabricated to apply and
:neasure torque, uplift load and deflections. Effect of pile
geometry and blade dimension on the torque required fOr
installation and uplift capacity of the .piles have been
evaluated.
Mathematical expressions are derived to relate pile
geometry (blade dimension and spacing) with torque required
for installation and uplift capacity. A good correlation is
found between measured tOrque at pile head with that calculated
from the derived mathematical expression and also between
measured uplift capacity with that calculated from derived
expression.
A good correlation is Observed between the torque
required for installing a pile and its uplift capacity. Based
on the experimental results emperical relations are proposed
to relate driving torque with uplift capacity. Some aspects
of screw pile installations in granular soils and uplift
capacity evaluations are highlighted.
