Comparison of behaviour of CFA piles in London clay as determined by static, dynamic and rapid testing methods

The Reuse of Foundations for Urban Sites (RuFUS) project identified the difficulties of testing piles that were to be reused for capacity and load settlement performance (Butcher et al. 2007a, b). In a reuse situation where new piles are to be used with existing piles the load settlement characteristics of the new and existing piles must be similar. With the effects of ageing and load history modifying pile behaviour during the life of a foundation and often the unknown geometry of the piles, there is a need to test piles due for reuse to get their relevant performance. The RuFUS Project found that load settlement predictions based on dynamic, rapid and static tests were significantly different. Further, the relationships between the predictions from each test technique varied between soil types.