Load Transfer Mechanism of Rock Socketed Piles Under Rotatory Machine-Induced Dynamic Loading
摘要
This study presents a simple 3D finite element analysis to understand the load transfer mechanism of a single rock socketed pile under rotating machine-induced dynamic loading. The dynamic analysis has been performed on a single pile of diameter 1.2 m and length 15 m at three different eccentric moments of 0.1 kg-m, 0.2 kg-m, and 0.3 kg-m. The soil has been modeled as Mohr–Coulomb model and the proposed finite element model has been validated with load–settlement curve of existing field data. Dynamic analysis under vertical and coupled vibration showcased that, with an increase in eccentric moment, frequency decreases and amplitude increases disproportionally, which is exemplifying by a nonlinear behavior. This study has been focused in determining the load distribution in pile at resonant frequency under vertical and horizontal dynamic loading. Further, this attempt had been extended to acquire the quantitative information regarding the stresses and strains in axial and lateral directions in the pile and soil at resonant frequency and also about bending moment along the pile. It is found that percentage of load transferred to the pile base is increased under the application of both vertical vibration and horizontal vibration when compared to the load transferred under static loading under both cases. It is also observed that under the application of both vertical and horizontal vibrations at resonance, stresses, strains, and bending moments got amplified along the length of the pile making it an end bearing pile.