04-11-2014, 02:20 PM
Abstracts: Pile foundations are frequently used to transmit the superstructure loads to deeper strata if the subsurface soil is of inadequate strength. Under both heavy static and dynamic loads along with constraint of working space the pile foundation is one of the most preferred foundation methods. Uplift forces act on the supporting piles if structures such as dry docks, basements and pumping stations are constructed below the water table. Therefore studying the behaviour of piles under uplift forces as well as the parameters affecting the uplift capacity of piles is one of the important areas of research in geotechnical engineering. Piles are generally used either as single pile or in group as per load requirement. However simple piles usually rest on group of piles. Moreover they have low capacity under heavy dynamic loads. In order to achieve economy and save time of construction, mono piles serve as a distinct advantage over simple piles. The load transfer mechanism of piles is based on friction as well as end bearing. . In cohesion less soils, the skin friction is a prominent source of pile capacity under axial loading especially when the pile is subjected to uplift loading. This advantage can be further increased by introducing corrugations of various geometries at the perimeter of the pile throughout its length. These corrugations will increase skin friction which ultimately results in increasing the resistance to uplift under heavy static and dynamic loads. The main objective of this project is to find the uplift capacity of mono piles with two types of corrugations viz. vertical slit corrugations and helical corrugations embedded in medium dense sandy soil with constant L/D ratio. Model tests are to be performed on corrugated mono piles of concrete (M25 grade) having 8.2 cm dia. and length 54 cm having L/D ratio 6.6. This model study will definitely help to understand the load transfer mechanism and increment achieved in skin friction due to these corrugations resulting in increased load carrying capacity. Also a comparative study between corrugated mono piles and simple piles will further help in economising the circular mono piles for soils.