Abstract
Pile foundations are often used to have enough vertical bearing capacity of structures on soft ground. However, in many case, large size foundations are needed to support inertia force of superstructures. On the contrary, such inertia force can be reduced by adapting spread foundations in spite of pile foundations, since seismic wave can be reduced between ground and foundation, due to base isolation and plasticity of ground, although spread foundations may show larger settlement compared with pile foundations.
In this paper, we have proposed spread foundation with ground improvement, which have both base reduction effect and sufficient vertical bearing capacity. Result of shaking table tests confirmed such advantage of proposed method. Additionally we have developed the analytically method, which can simulate seismic behavior of spread foundation with ground improvement.
