ABSTRACT
A reinforcement method utilizing steel sheet piles (sheet pile reinforcement method) is sometimes adopted in Japan for reinforcing existing foundation structures. This is a reinforcement method where steel sheet piles are installed into the ground so as to surround the existing footing and are integrated with the footing. Since the widening width of the footing can be minimized, this reinforcement method is often adopted at locations where land usage is severely restricted. However, it hasn’t been clarified whether this reinforcement method can be applied to structures in the liquefiable ground. Therefore, in this study, model vibration experiments are conducted to clarify the effect and the mechanism of this reinforcement method for pile foundation structures in the liquefiable ground. Furthermore, considering of the experimental results, a structural analysis method is proposed to design this reinforcement method, which can correspond to changes in strength and stiffness of the ground due to liquefaction.
