自升式平台插桩性能分析及验证

Analysis and Verification of Pile Penetration Performance of Jack-up

基于静压贯桩试验对桩端底部压力分布规律进行验证表明,桩靴底部压力由内向外先增大,后减小,再增大。采用ABAQUS/ALE模拟插桩过程以研究Mohr-Coulomb模型中土体各参数物理意义对桩端承载影响。数值模拟结果表明,弹性模量对桩靴承载力影响不大;泊松比控制桩靴上部空腔的形成、发展及破坏机理。摩擦角、内粘聚力影响土体剪切强度及桩端承载力,其中以摩擦角影响为主。

Based on the demonstration of the static pressure exerted on the jack-up pile test on the distribution rule of the spudcan bottom pressure, it shows that the spudcan bottom pressure first increases, and then decreases, and increases sharply, from inside to outside. A numerical model for pile-soil penetration process in ABAQUS/ALE（Arbitrary Lagrangian-Eulerian） is built to research the physical significance of the soil parameters in Mohr-Coulomb model. The simulation results indicate that the elasticity modulus has little influence on the spudcan bearing capacity, whereas the poisson＇s ratio controls the formation development and failure mechanism of cavity. The parameters of the friction angle and the internal cohesion influences the soil shearing strength and the spudcan bearing capacity, but the friction angle is superior to the internal cohesion.