EFFECT OF INPUT WAVE ON SUBGRADE REACTION OF PILE IN LIQUEFIED SOIL

Shaking table tests are conducted to investigate an influence of input wave forms and these maximum acceleration levels on lateral ground force acting on a pile, namely, subgrade reaction in liquefied soil. It is shown that (1) The subgrade reaction mainly acts on a pile as a reaction force before soil liquefaction, and as an external force during soil liquefaction; (2) The pile stresses and displacement under the Port Island wave are larger than those under the Rinkai wave after soil liquefaction; (3) The maximum total subgrade reaction and the maximum inertia force of building act on the pile with a phase delay.