Abstract:

With the advantages of both high strength of rigid pile and large permeability of granular pile, pervious concrete pile was suitable for reinforcing foundation. In order to study the settlement-controlling and pressure-reduction effect, based on finite element method and Biot′s consolidation theory, the excess pore water pressure, pile-soil stress ratio, horizontal displacement and settlement of pervious concrete pile composite foundation under the loading of embankment were studied, and compared with those of gravel pile composite foundation and plain concrete pile composite foundation. It was found that the excess pore water pressure in the pervious concrete pile composite foundation was induced by the loading of embankment dissipated quickly, which showed that the pervious concrete pile had significant pressure-reduction effect. Furthermore, the pervious concrete pile composite foundation had the minimum horizontal displacement and post-construction settlement, which proved that the pervious concrete pile could evidently reduce the settlement of foundation. Therefore, the pervious concrete pile was particularly suitable for reinforcing foundation with poor water permeability and large post-construction settlement.

Key words: pervious concrete pile, composite foundation, excess pore water pressure, settlement