Piles Engineering

What is Pile Foundation?
A pile foundation, a type of deep foundation, is a thin column or long cylinder composed of concrete or steel used to support the structure and transfer the load at the necessary depth by end bearing or skin friction.

Pile foundations are typically utilized for large structures and when the shallow depth soil is insufficient to resist excessive settlement, uplift, and other issues.

Uses of Pile Foundation:
In the following circumstances, piling foundations are preferred.

• The superstructure’s load is heavy, and it’s distributed unevenly.
• Water pumping from open trenches for shallow foundations is challenging and expensive.
• The bearing capacity of the topsoil is low.
• The water level in the subsoil is high, so
• The water level in the subsoil varies dramatically.
• Timbering the trenches is tough and expensive.
• The character of the topsoil is expansive.
• The structure is located along the water’s edge or in a riverbed, vulnerable to scouring.
• Near the foundation, canal or deep drainage lines escape.
• The foundation of transmission towers, an off-shore platform vulnerable to uplift forces, is made of piles.

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By
Shubham Sunil Malu

ABSTRACT
Piles are structures used to transfer loads from superstructure to the sub surface strata. When the subsurface stratum is water based or if we deal with a hydraulic structure, the piles are to be driven into water and under water strata. Piles used in underwater structures are often subjected to corrosion. There is no absolute way to eliminate all corrosion; but corrosion protection measures are employed to control the effect of corrosion. Corrosion protection can be in different ways according to the environment and other factors. Forms of corrosion protection include the use of inhibitors, surface treatments, coatings and sealants, cathode protection and anode protection. The control measures explained in this are Protective coatings, cathode treatment and application of Fibre Reinforced Polymer (FRP) Composites.

CHAPTER-1 INTRODUCTION
Corrosion is the destruction of metals and alloys by the chemical reaction with the environment. During corrosion the metals are converted to metallic compounds at the surface and these compounds wears away as corrosion product. Hence corrosion may be regarded as the reverse process of extraction of metals from ore.

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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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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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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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