Analys On The Bearing Performance Of The Super-Long Pile Influenced By The Length

With the development of super-tall building and long-span bridges, it is necessary to mass-use super-long bored piles because of their high bearing capacity. Though a large number of super-long Piles have been used, its load transfer mechanism is not distinct. By now, its design method still adopts that of the ordinary piles, which disagrees with practical situation. The design method of super-long pile in the applicable codes and standards is not based on the mechanism of load-bearing and deformation. Therefore, the research on the load-bearing properties and the reasonable design method of the super-long piles is important to meet the requirements of the theory and the reality.Based on the research status at home and abroad, the engineering properties and the pile settlement theory of the super-long piles are analyzed in the paper.It is done the preliminary study to theory background of the FLAC^3D software, and introduction to the FLAC^3D software computation principle and (?)e construction models.Introduce the primary theoretics of modeling. Uses the FLAC^3D software to create the single pile modeling and to simulate of Lizigou bridge, and compare with the test result which does with the scene, the effect of the simulate is preferable.The super-long pile load-bearing properties in isotropic soil is studied by the FLAC^3D software. In the FEM program, the elasto-plasticity of concrete is considered, and the Mohr-Coulomb model and the contact surface model are adopted to simulate the characters of soil and the interaction of pile and soil respectively. The influence of the bearing performance of the suer-long pile is analyzed while its length changed.