Long JIANG +

^{China Institute of Water Resources and Hydropower Research，Beijing 100038 China}

Abstract: In order to provide the basis for design and construction of CFG pile, as well as to promote the foundation treatment, settlement time property of composite foundation is studied by means of 3-D liquid-solid coupling numerical simulation methods considering Biot consolidation theory. The results prove that:   ① 3-D numerical simulation considering Biot consolidation theory can well study settlement time property of composite foundation;   ② Increasing pile length and pile diameter and reducing pile space and compressibility of soil, is helpful for controlling the settlement deformation and the effect of increasing pile length is most remarkable; Increasing pile length, pile diameter and permeability of soil and reducing cushion thickness, pile space and compressibility of soil, is advantageous to shortening the consolidation time and the effect of increasing permeability of soil is most remarkable.  ③ The main factors which influence settlement control of pile-slab composite foundation are pile length and preloading, and the optimization design scheme of controlling settlement of pile-slab composite foundation has been carried out in the paper. The scheme is simple and practical, and can be used as scientific basis for the optimization design, and can guide design and construction of high speed railway.

Keywords: Pile-slab composite foundation; Settlement time property; Optimization design;

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