An experimental study into the ultimate capacity of an ‘impression’ pile in clay

The ultimate capacity of a novel type piled foundation called an ‘impression’ pile has been investigated using centrifuge modelling techniques. name derives from the small discrete impressions created in side walls bored cast situ to increase soil/pile friction such that form nodules on shaft concreted pile. technology is suitable for piles overconsolidated clay, as London Clay. experiments explored influence geometrical parameters vertical spacing impressions, their number at each level and shape. data show consistent 40% when extend over 85% length. primarily affected by length which impressed, given cross-section direction, long this greater than threshold value. According experimental evidence, block failure occurs lower Plastic mechanisms impression were established. These used successfully calculate tested with error less 10%.