Model Text Study On The Double-row Piles With Beam And Plate Contact Structure

Double-row piles as a new type of deep foundation pit support system first appeared in the late80s the last century, because the research started relatively late, at present the mechanical mechanism of double-row piles has not been unified computing model, still in a state of half theory and experience, on the basis of predecessors’research, I expand the research scope of double row piles, combined with the engineering example, make the double-row piles in the scene scale down into the indoor model test, through model test and finite element simulation of beam and plate contact of two different structures of double-row piles systematically, more in-depth research and analysis, to get which contact structure comprehensive benefit is higher and the main research work is as follows:(1) through the indoor model test, analysis and research on the front and back pile spacing respectively take4d,5d,6d conditions, for the two kinds of beam and plate connection structure of double-row piles supporting structure at the top of the pile displacement and deformation of pile body and the distribution of earth pressure and different changes. The experimental results showed that:beam, plate structure in the form of double row pile top displacement cumulative change values are increased with the increase of excavation depth increases; The top displacement cumulative value which adopts plate connection structure of double-row piles changes slightly smaller than the beam connection structure of double-row piles; Two kinds of contact structure displacement of pile top cumulative change value decreases with the increase of front and back pile spacing. To bottom elevation, the excavation of beam connection structure in front of the pile body both positive and negative bending moment value is less than the plate connection structure; Back row pile, by contrast, beam contact structure is greater than the plate connection structure; Contact two structural forms of double row pile body bending moment with front and back pile spacing increases; The earth pressure of front and back pile, the influence of pile is larger, the measured soil pressure distribution law is bad, tests the measured soil pressure between the pile decreasing trend with the increase of excavation depth.(2) combined with engineering example, using the large finite element software ABAQUS in combination with an engineering example of model test and engineering calculation and simulation field excavation process, analysis of two kinds of contact of the structure of the double-row piles supporting structure at the top of the pile displacement and bending moment of pile and soil stress distribution of different situations, simulation conclusion conclusion is consistent with indoor model test, through the measured data through the comparative analysis and numerical simulation results, verified the rationality of this idea.