Abstract:
The thesis deals with the penormanee of small size ( I751I1ITU'( I75mm) prestressed
pile. Maintained load test were conducted to investigate the load carrying capacity
and settlement of the piles. Four sites within Dhaka City were selected for the.
purpose.
"111emeasured capacity detennined from pile load tesls was compared with the
predicted capacity using static methods & dynamic methods.The measured ultimate
capacity of piles driven through Dhaka Clay and resting on Dhaka Clay is in close
agreement with the predicted values using A. method.The skin friction of piles
driven through Dhaka Clay predicted by IX, method is slightly smaller than the
estimated value from pile load test. This method can safely be used for predicting
the ultimate skin friction of Dhaka Clay. It is observed that API method grossly
underestimate the skin friction of piles in Dhaka Clay.
The ultimate capacity of piles driven through Dhaka Clay and resting on medium
dense sand can be predicted using the combinations of A. method and Meyerhofs
empirical method, A. method and Hansen's method,1Xmethod and Meycrhofs
empirical method, IX method and Hansen's method, IX, method and Meyerhof s
empirical method, IX, method and Hansen's method. The value of ultimate capacity
predicted by API method and Indian Standards method is about half of the
measured ultimate pile capacity determined from pile load test.
It is also observed that the ultimate capacity predicted by pile driving formulae
such as Engineering News Records formula, Janbu formula and Hiley formula, in
general, overestimate the measured ultimate capacity. However these formulae
underestimate the allowable capacity when used with the recommended factors of
safety
