Study on Settlement Time Property of Composite Foundation

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 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, pile diameter, permeability of soil and surcharge preloading, and reducing pile space and compressibility of soil, is advantageous to dissipation of excess pore water pressure and shortens consolidation time and the effect of increasing permeability of soil is the most remarkable; (3) increasing pile length, pile diameter and surcharge preloading, and reducing pile space and compressibility of soil, is helpful for controlling settlement deformation and the effect of increasing pile length is the most remarkable; (4) design ideas of sparse-density pile are brought out and the main factors for settlement are surcharge preloading and pile length.