The Role Of Pressure Top Ring Beam And The Spatial Coordination Of The Supporting Piles

Aiming to widely using cantilever pile in the deep excavation engineering, according to analyzing function mechanism of cantilever pile, this paper research that top beam can change internal force and distortion of cantilever pile body, and hope that this theoiy can provide help for design and construction. Because top beam can change internal force and displacement of supporting pile, and both them restrict and correspond each other in space. According to this character, this paper looks them as a whole body, postulating a model of spacial single-layer multi-span frame. At cooperating work state, for the sake of accurately reflecting force and distortion of pile body, this paper considers several problems as followed. Under the pit, pile locating in the passive soil pressure preferably operates with soil, which accord elastic foundation beam theory, so soil pressure is simulated as soil spring throwing on the piles. By way of calculating soil spring stiffness, this paper researches soil bed modulus changing following changing of digging depth. When reckon external force, this paper adopts layed soil pressure method. At the same time, both ends are thought over fixed ends. The finite element method has good adaptability when this method analyses system of pile and soil. Therefore, when this paper analyses whole system, it takes use of special staff finite element method, which disperses all system being finite beam elements, and think soil pressure as external loads putting on the elements. Then this method uses software 揂NSYS?that can computes internal force and displacement of pile restricted by top beam. Moreover th抜s paper considers cantilever pile. By comparing them, this ~ spacial method is proved feasible, and it provide reference for actual engineering.