Two series of shaking table tests, i.e., one had a quay wall and the other had not, are conducted to clarify a lateral ground force acting on piles in liquefied and laterally spreading soils. It is shown that (1) The lateral ground force acting on a pile in laterally spreading soil as well as that in liquefied soil has character of solid ground due to decrease of excess power water pressure and recovery of effective normal stress after liquefaction; (2) The lateral ground force acting on a pile near quay wall becomes nine times larger than the maximum inertial force at a pile head in laterally spreading soil.
