Research and application on the road tubular pile composite foundation

This paper presents the main structures of the road tubular composite foundation: the embankment fill, tubular pile, cover plate, geogrid and foundation soil and, in the project, analyzes the structural function of the tubular pile, cover plate and geogrid. In the viewpoint of the key problems of the bearing behavior and the settlement: the soil arching effect, the tensioned membrane effect, the soil core effect and settlement analysis, this paper systematically summarizes the research of tubular pile composite foundation at present, which also presents a discussion for the further studies; then, from an engineering project, the paper deeply analyzes the rules of the stress, the settlement, the excess pore water pressure, the lateral deformation and so on, which may be an instruction for the scholars on the tubular pile composite foundation, and comments the gas between the research and the application: the research usually considers independently the mechanisms developed in the load transfer and the settlement, but the application is the result of the complex behavior of the full system, so systematic and integral study is necessary.