الفهرس 
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Abstract
Auger-cast piles are formed by screwing a continuous flight auger into the ground, and pUml)ing cement/sand grnut III’ concreh’ down the hnllllw stem nf th(’ auger as its withdrawal. The auger is drh’en at top by hydraulic or dectri(’ mntnr and is guided by a vertical crane leader. The C.F.A. piling technique is fast and economical. There is no vibration, very little noise, and none of the ground movement commonly associated with driven piles.
Because of the increased use of this type of piles all over the world especially in Egypt, there is a need for a de..’lign procedure. This thesis contains two main parts. The first is a trial to correlate the ultimate bearing pressure of a point bearing C.F.A. pile with the average SPT value near the pile tip. Sixty five field pile loading tcsts are collected. Chin and Mazurkiewicz methods are used for prediction of pile ultimate loads, while the method proposed by Abdrabbo and EI-Hansy is used for prediction of pile working loads. The second part is the experimental work that involves the construction of a C.F.A. laboratory model to study some installation factors affecting pile response.
The study reveals the following conclusions:
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- The ultimate bearing pressure of the C.F.A. pile can be correlated to the average SPT value near the pile tip as:
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qub = 285 N
- The working bearing pressure of the C.F.A. pile can be correlated to the average SPT value near the pile tip as :
qwb = 100 N
The rotation speed of the auger without any penetration is to enlarge the pile diameter and consequently slightly increase the ultimate pile load.