Abstract
Horizontal loading tests and shaking table tests were conducted to describe the pile group efficiency in the liquefied ground. It is shown that (1) In the non-liquefied ground, subgrade reaction and pile top shear force of the front pile increase the most. (2) In the liquefied ground, there is no difference between the piles top shear forces, when the subgrade reaction is almost zero. (3) In the liquefied ground, the difference in the pile top shear forces for different pile positions is not clear, since there are factors that the subgrade reaction of the inside piles increases for cyclic mobility of the ground, and that of the outside piles increases for relative displacement between pile and ground.
