2025 Volume 81 Issue 15 Article ID: 24-15031
A seismic reinforcement method is being developed to reduce the cross-sectional forces generated in existing piles by sheet piles around the existing pile foundations. The reduction effect on the existing piles is caused by the group pile effect between the sheet pile and the existing pile, but the conventional evaluation method for the group pile effect cannot be applied because of the difference in stiffness and length between the sheet piles and the existing pile. In this study, horizontal loading tests were conducted using a two-dimensional model of aluminum lods laminated soil and a three-dimensional model of dry Toyoura sand. it was confirmed that the reduction of cross-sectional force of existing piles is caused by the reduction or blocking of compressive strain in the passive wedge region of the existing pile by the reinforced sheet pile, which reduces the subgrade reaction. Based on the results, a quantitative evaluation method for the reduction of cross-sectional force of existing piles caused by the group pile effect is proposed.
