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Technical paper: Quality assurance of bored pile foundations

Gordon Cameron, PhD research student, Napier University and Tim Chapman, associate director, Arup Geotechnics. This paper was first published in GE’s February 2004 edition.


The performance of a bored piled foundation is affected by the construction quality of the individual piles comprising the piling system. For the purposes of quality assurance, a programme of non-destructive integrity testing (NDT) is usually implemented on a specified percentage of the working piles. Traditionally, the proportion of piles to be tested is decided upon by the foundation designer based on site-specific knowledge, engineering judgement and his prior experiences of NDT. This paper shows how the use of statistics and probability theory may help influence this decision. 

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