Double Rotary CFA Piles: Performance In Cohesive Soils

The occasional substandard performances of continuous flight auger in particular soil conditions have prompted the drilling rig manufacturer to improve the standard CFA in order to reduce its negative effects. A real improvement of interest was the launching of the double rotary CFA system. The promising features of the latter have incited the authors to implement an extensive experimental research on pile constructed using this type of technique but in the specific context of cohesive soils. Short-term static load tests were carried out on a total of 9 test piles of various installation techniques in order to compare the respective performances. The promising features of the double rotary CFA have incited the LCPC & Durmeyer Company to implement an extensive experimental research on this type of pile technique but in the specific context of cohesive soils and more particularly in clayey marls. After load tests completion the research has been completed by an excavation of the double rotary CFA piles. All the collected data concerning the implemented program are reported.