The ground improvement based on the deep mixing method of soil stabilization is often carried out for the strength increase of the foundation. The development of an appropriate evaluation method of the seismic behavior of such a composite ground is an urgent business, because the performance-based design method will be adopted in the design code. In this study, the estimation method of the values of equivalent ground parameters to the composite ground with columnar improvement is proposed based on the dynamic elasto-plastic FEM and the neural network technique. By using the proposed method, the improved ground can be modeled as a homogeneous ground on the basis of its seismic response characteristics.
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