City Research Online

Forces involved with the extraction of casings used in rotary bored piling

Gorasia, Rohit J., McNamara, A. M., Bell, A. & Suckling, T. (2014). Forces involved with the extraction of casings used in rotary bored piling. Paper presented at the 8th International Conference on Physical Modelling in Geotechnics 2014 (ICPMG2014), 14th - 17th Janurary 2014, Perth, Australia.


Temporary casings are regularly used in the construction of rotary bored piles, to support the pile bore in potentially unstable soils and also to prevent water ingress from loose or water logged soils. The preferred method of removal of casing is by pulling with a crawler crane. However, the magnitude of force generated, particularly during the initial stage of casing extraction, is unknown. This paper describes a series of 50g centrifuge tests designed to model the casing and surrounding soil during extraction by crane. In each test different sized model casings were installed at various embedment depths into a layer of clay overlain by a well-graded sand to provide an array of data. The depth of granular overburden was varied from 60 mm to 120 mm to allow for assessment of the influence of this material on the extraction force whilst the casing sizes modelled 900 mm and 1800 mm prototypes.

Publication Type: Conference or Workshop Item (Paper)
Additional Information: DOI: 10.1201/b16200-97
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Science & Technology > Engineering
[thumbnail of Casing_Extraction_ICPMG14_(revised).pdf]
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