The Understanding of Continuous Flight Auger Piling, Its Monitoring and Control. Discussion.

Fleming, Wgk; Osbourne, R S

doi:10.1680/igeng.1996.28760

Cited by 3 publications

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“…Numerous authors (Metcalf 1965, Van Weele 1988, Thornburn, Greenwood and Fleming 1993, Viggiani 1993, Fleming 1995, Slatter and Seidel 2000, Bustamante 2003) have tried to define suitable theoretical auger models to describe the complex process of cutting, transport and displacement. The pile-soil interaction and load capacity between full-displacement, partialdisplacement and non-displacement piles can vary considerably, as the auger action in the soil is different for all three systems.…”

Section: -Work Program (Chapter 6)mentioning

confidence: 99%

“…The lack of understanding, especially of non-displacement screw piling techniques, caused numerous failures and led to a negative perception of these techniques by many major clients (Fleming 1995).…”

Section: Construction Monitoringmentioning

confidence: 99%

“…Screw auger piling techniques are commonly used in Australia and around the world, and sophisticated hydraulic piling rigs as well as a range of screw auger displacement tools to install different pile types can be bought 'off the shelf' from various suppliers in Europe, Asia and America (Fleming 1995, Pagliacci et al 2003. Figure 7 shows the difference between a piling rig installing CFA piles and a conventional rotary bored piling rig with a Kelly bar.…”

mentioning

confidence: 99%

“…This method was used first in the United States (US) in the early 1940s (Gupte 1989). Fleming (1995) reports of the implementation of CFA piles in Europe about 40 years later in the early 1980s, with the development of equipment that allowed the use of concrete rather than sand-cement grouts.…”

mentioning

confidence: 99%

“…The drawbacks of this system include that the risk of soil decompression or over-excavation in granular soils when penetration rates are too slow might cause unwanted settlement of adjacent structures. Pile load capacities are also strongly dependent on installation parameters and operator skill (Van Weele 1988, Fleming 1995.…”

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Behaviour of stiff, fine-grained soil during the installation of screw auger displacement piles

Larisch¹

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Screw auger displacement piling tools have been successfully used throughout the global piling and ground engineering industry for decades. The technique can be used to install circular concrete elements referred to either as piles, to transfer structural loads into stiffer layers; or as rigid inclusions (known as drilled displacement columns, CSC, CMC, etc.), to reinforce and strengthen unsuitable ground as a soil improvement technique. The effect of installation parameters on screw auger displacement pile performance and load capacity in hard clay formations has not been investigated in detail and is the main scope of this research work.For both applications, it is desirable that the pile or column toes are embedded into a displaceable dense, stiff or hard bearing layer. Loads from the structure are then transferred directly (via piles) or indirectly (by settlement of the soft layer and the resulting negative skin friction along the column shaft) into this bearing layer. As the design methodologies for these applications are different, this research work introduces the latest applications and design philosophies for both screw auger displacement piles and rigid inclusions.As the typical diameters for screw auger displacement piling tools range from 270 mm to 610 mm, the working loads to be transferred are typically limited to 500 kN to 2,500 kN, depending on tool diameter and ground conditions. Both displacement piles and rigid inclusions are economical for use in projects with low to medium structural load-transfer requirements, like warehouses, embankment approaches or tanks.For soil improvement projects, rigid inclusions are usually designed by calculating the settlements of the entire soil block (as reinforced with rigid inclusions), typically using finite element methods. Analytical design methods cannot practically reflect the complex interaction between the stiff concrete columns and the softer surrounding soil; therefore, this interaction needs to be modelled by numerical means.For screw auger displacement piles, the additional load capacity caused by the soil displacement effect around the shaft and the base can be taken into account for the design work if there is sufficient evidence about the degree of the potential improvement.By considering increased skin friction because of soil displacement created during the pile installation process, piles could be designed to be shorter and more economical than would be possible using the traditional approaches used for conventional bored piers without any known improvement effects. The traditional 'α-c u ' method and the approach for screw auger displacement piles developed by Bustamante and Gianeselli (1998) are introduced and used in this work. -iii-To compare the results of the design calculations with real load-settlement data, two different screw auger full-displacement piles (progressive displacement versus rapid displacement tools) and one small diameter Continuous Flight Auger (CFA) pile were installed with 4.0 m penetration into hard clay at...

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Section: -Work Program (Chapter 6)mentioning

confidence: 99%

Section: Construction Monitoringmentioning

confidence: 99%

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Behaviour of stiff, fine-grained soil during the installation of screw auger displacement piles

Larisch¹

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Beitrag zum Entwurf und zur Ausführung von kombinierten Pfahl‐Plattengründungen

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Pucker

2011

Bautechnik

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Recent Advances in the Selection and Use of Drilled Foundations

Brown¹

2012

Geotechnical Engineering State of the Art and Practice

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The construction and design of drilled foundations in recent years has been most significantly affected by developments in drilling techniques related to materials, equipment, and generally improved capabilities in construction. In addition, advancements in technology for testing and QC/QA have resulted in improvements in performance, reliability and design. This paper describes some of the most significant developments affecting drilled foundations, including large diameter drilled shafts, continuous flight auger piles, drilled displacement piles, and small diameter micropiles.

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The Understanding of Continuous Flight Auger Piling, Its Monitoring and Control. Discussion.

Cited by 3 publications

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Behaviour of stiff, fine-grained soil during the installation of screw auger displacement piles

Behaviour of stiff, fine-grained soil during the installation of screw auger displacement piles

Beitrag zum Entwurf und zur Ausführung von kombinierten Pfahl‐Plattengründungen

Recent Advances in the Selection and Use of Drilled Foundations

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