الفهرس 
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Abstract
Structures like flood walls, dock-fendering systems, tower foundations, submerged platforms, and bridge abutments are constructed on pile foundations, which are subjected to tension loads. Piles subjected to uplift loads comprise of steel H-piles, steel pipe piles, modified enlarged end, anchored piles, bladed piles, screw piles and finned piles. Embedded anchor piles are extensively used where the foundations of structures are subjected to oblique tensile loads. Tension piles permit the transition of uplift loads to the soil at a deeper depth and far-flung from the construction. Tension piles of different types are now utilized for excavation, slope stabilization, dams, quay walls, underground, anchoring structures, foundations and hydrostatic uplift loads. Anchor piles are also utilized for oblique or horizontal tieback resistance of waterfront and earth-retaining structures. The different types of anchor piles used in geotechnical engineering include, ground anchors, soil nails and rock bolts, micropiles, port tie rods. Therefore, extensive investigations are needed to explore ways to improve the uplift capacity of piles. These techniques are designed to supply an additional suitable instrument at a specific depth along the pile by altering the shape of the pile to get a beneficial influence. Various techniques were used to enhance the tensile capacity of anchor piles of different shapes in sandy soils. These techniques are prohibitively restricted by the conditions at the site, intricate in installation and can be very expensive. So, this research aims to use a novel technology which can be easy installed in the site. The II conventional pile has been altered to resist tension loads by utilizing wings at a specific depth along the pile. The winged piles under oblique tension loads were examined and their behaviour was estimated in sandy soils. The oblique tension load capacities of winged piles installed in dry sandy soil were studied in comparison to conventional piles without wings. The thesis comprises of two parts, the first one is laboratory tests with total number of one hundred and seventeen experimental tests which were conducted on anchor-winged pile at different parameters in dry sand. For comparison, tests were performed on conventional piles without wings to study the behaviour of winged piles on the oblique tensile capacity under different parameters. The second part is performed to investigate the behaviour of winged pile using finite element analysis by program PLAXIS 3D version (2010). In this study a series of run on model piles were accomplished to elucidate and confirm the model test results. In addition, analysis of failure pattern and deformation behaviour technique are discussed in detail. The effect of wings embedded below the soil surface was investigated. The test results exhibited that, the wings of the pile play an appreciably role in its pullout capacity as well as oblique loads. This is accredited to the section modulus of anchored pile shaft is augmented at the tip of the winged pile due to the existence of such wings which lead to a soil–pile wings interaction. Therefore, the oblique tension capacities were enlarged.