XIAO Yongjie, CHEN Fuquan, LIN Liangqing. 2016: ALE FINITE ELEMENT ANALYSIS ON PENETRATION PROCESS OF OPEN-ENDED PIPE PILES DRIVEN WITH HIGH FREQUENCY HAMMERS. JOURNAL OF ENGINEERING GEOLOGY, 24(3): 398-408. DOI: 10.13544/j.cnki.jeg.2016.03.009
    Citation: XIAO Yongjie, CHEN Fuquan, LIN Liangqing. 2016: ALE FINITE ELEMENT ANALYSIS ON PENETRATION PROCESS OF OPEN-ENDED PIPE PILES DRIVEN WITH HIGH FREQUENCY HAMMERS. JOURNAL OF ENGINEERING GEOLOGY, 24(3): 398-408. DOI: 10.13544/j.cnki.jeg.2016.03.009

    ALE FINITE ELEMENT ANALYSIS ON PENETRATION PROCESS OF OPEN-ENDED PIPE PILES DRIVEN WITH HIGH FREQUENCY HAMMERS

    • Arbitrary Lagrangian-Eulerian(ALE) methods couple the advantages of Lagrangian and Eulerian methods, and avoid the mesh distortion problem of Lagrangian method of general finite element. The methods can effectively analyze the penetration process of open-ended pipe piles driven by high frequency hammers. Based on ALE finite element methods, the finite element model of full penetration process of open-ended pipe piles driven by high frequency vibratory hammers is built. The paper studies in detail squeezing effect, frictional resistance and soil plugging effect during pile-sinking. The computational results show that the compacting stress mainly spreads along the horizontal direction, and the compacting stress in deep soil layers is larger than compacting stress in shallow soil layers. The horizontal compacting displacements increase with the increase of penetration depth. But the maximum compacting displacement delays penetration depth. The affecting range of squeezing effect is approximately 10 times pile diameter. So it is necessary to put great emphasis on full penetration process of pipe pile. Outside friction resistance of piles increases linearly with the increase of penetration depth. Inside friction resistance of piles increases nonlinear with the increase of penetration depth. The growth rate increases gradually with the increase of penetration depth. Soil plugs of pipes are incompletely plugged conditions. Degree of soil plugs varies from unplugged conditions to partially plugged conditions. Furthermore, the influence of soil elastic modulus, frictions, vibration frequencies and pile diameters on the compacting displacements are investigated.
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