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Behaviour of Open and Closed End Pile Groups Subjected To Vertical Loading : A Comparative Study

By
Singh P.K. (Department of Civil Engineering, National Institute of Technology, Kurukshetra, Haryana, INDIA)
Arora V.K. Professor, (Department of Civil Engineering, National Institute of Technology, Kurukshetra, Haryana, INDIA)

Abstract
Steel pipe piles are highly durable, provide reliable foundation, have shorter construction period and can be driven into such medium where other piles can’t like boulder medium. Steel pipe piles are economical for long piles into deeps loose soil. Till now most of research has been directed towards the response of individual piles to vertical loads. Both the driving response and static bearing capacity of open-ended piles are affected by the soil plug that forms inside the pile during pile driving. In order to investigate the effect of the soil plug on the static and dynamic response of an open-ended pile and the load capacity of pipe piles in general, field pile load tests were performed on instrumented open- and closed-ended piles driven into sand. For the open-ended pile, the soil plug length was continuously measured during pile driving, allowing calculation of the incremental filling ratio for the pile.

Keywords- Pile Foundation, pile cap, bearing capacity, pile group, pile load tests, piles driving

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How to carry out water control for sheet pile walls?

Ground water flow into excavations constructed by sheet pile walls should be minimized in order to save the cost of the provision of pumping systems or well points to lower the water table inside the excavation.

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What are the effects of pile groups on slope stability?

The ground conditions in hillsides of Hong Kong normally consist of colluvium overlying weathered and fresh rock. The groundwater flow in sloping ground may involve both perched and main water flow. As permeability of soil tends to decrease with depth, groundwater flow may take place in the upper aquifer which contains a perched water table.
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In deep excavation, adjacent ground water table is drawn down which may affect the settlement of nearby buildings. What is the remedial proposal to rectify the situation?

One of the methods to control settlement of nearby buildings due to excavation work is by recharging. Water collected in wells in deep excavation is put back to the top of excavation in order to raise the drawn-down water table.

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The origin of Daido piles comes from Japan where these prestressed concrete piles are used as replacement plies. Holes are pre-formed in the ground and Daido piles are placed inside these pre-formed holes with subsequent grouting of void space between the piles and adjacent ground. However, in Hong Kong Daido piles are constructed by driving into ground by hammers instead of the originally designed replacement method.
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