Affiliation:
1. Department of Civil Engineering, City, University of London, UK (corresponding author: )
2. Department of Civil Engineering, City, University of London, UK
Abstract
During construction of rotary bored piles it is necessary to install a temporary casing to prevent the collapse of material into the open bore and provide edge protection. The preferred method of removal for some contractors is by means of the handling crane. In 2010, the Federation of Piling Specialists (FPS) released guidance to predict the load developed in the removal of casings. This paper investigates whether the recommended constants applied to the overburden and clay terms are reasonable for various casing diameters, embedment and depth of overburden. A series of five centrifuge tests were conducted where loads recorded as casings were extracted. Results showed that the FPS method over-predicted the pull-out force and indicated that the adhesion factor, α, and angle of dilation between the casing and soil, tan δ, are not constant. This paper proposes a new method of predicting extraction forces, which was found to predict forces to within ±10% of those measured in centrifuge tests.
Subject
Earth and Planetary Sciences (miscellaneous),Geotechnical Engineering and Engineering Geology
Cited by
1 articles.
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1. Editorial;Proceedings of the Institution of Civil Engineers - Geotechnical Engineering;2018-04