Study On Numerical Simulation Of Continuous Penetration Of Enlarge End Jacked Piles By Abaqus

With the expansion of the scale of China’s urban construction, the pilefoundation is widely used. Jacked pile is safe, reliable, economical, and theconstruction of civilization, green, etc. has been rapid development. On the basis oftheoretical analysis, the use of large general-purpose finite element softwareABAQUS for the enlarged end jacked pile continuous penetration numericalsimulation. The enlarged end jacked pile toe resistance and pile shaft resistance andnumerical simulation of the problem has been studied to provide a sufficient basisfor engineering applications and more in-depth analysis. In this paper include thefollowing:1. A brief introduction of the advantages and adaptability of ABAQUS ingeotechnical engineering, convergence due to the enlarged end jacked pilecontinuous penetration of the pile-soil interaction is large deformation, nonlinear,and Calculation of difficult convergence. In order to achieve penetration, thedisplacement of the penetration method, the pile-soil interface to select the penaltystiffness method, allowing the flexibility to slip deformation, and suggested that therational division of pile tip soil under the unit size for the enlarged end pile of thelargest cross-section radius1/2~4/5.2. Use of relevant test parameters, the successful realization of the continuousexpansion of the enlarged end jacked pile and jacked pile penetration. Thecomparative results are as follows:(1)When the same depth of penetration, the pile cone of the enlarged end jackedpile at the radial stress is higher than the pile cone of ordinary jacked pile. The shaftby radial stress at the same depth, the shaft of enlarged end jacked pile less thanjacked pile; enlarged end jacked pile by the vertical stress is less than the verticalstress suffered by the ordinary jacked pile, both can be reflected in the piling force,pile penetration force of the same depth in the same soil, and enlarged end jackedpile of the pressure force is relatively small. (2) By the displacement of soil analysis found that the pile and the soil at acertain depth are completely separate, horizontally on the soil the maximumdisplacement and the maximum cross-section of the pile diameter are basically thesame, vertical direction of the maximum displacement occurs at the pile cone.3. Actual pile pressing force, simulation of the pile shaft resistance and pilepressing force simulation comparison, come to the actual pressure of the pile forceand analog pile pressing force fitting better at a certain depth. In addition, also foundthat the simulation of pile shaft resistance compared to the pile pressing force in thesimulation is very small, can be approximated by the simulated value of pile pressingforce as is the toe resistance. Piling to ordinary static pressure pile simulation underthe same conditions, on a pile shaft resistance, toe resistance and pile shaft resistanceseparation.