Static loading tests to plunging “failure” were performed on a single pile and a group of 13 piles in a loose to compact silty sand. The piles were 300-mm diameter, 9.5 m long, bored piles with an expanded pile toe, a 400 mm wide Expander Body (EB). Each pile had a bidirectional cell place just above the EB. All pile heads were free. The tests comprised a bidirectional test on the piles with the pile group cells activated via a common pressure pump, thus, ensuring that equal load was applied to all piles, allowing each pile to move individually. The pile group responded as a pier with shaft resistance equal to the shear along its side rather than as 13 single piles.