振动锤作用下海上基桩可打入性的数值模拟

Numerical simulation of drivability of offshore pile under the action of vibratory hammer

以ANSYS/LS-DYNA作为前处理器,利用粘弹塑性非线性弹簧元模拟桩土相互作用,对打桩下沉过程建立了数值模型,并结合渤海某打桩工程,分析了振动锤作用下动态土强度折减系数、激振频率、入土深度、土塞效应等主要因素对桩体可打入性的影响。结果表明,本文方法适用于不同深度时桩基可打入性的研究,对实际工程具有一定的指导意义。

The finite element analysis software AN- SYS/LS-DYNA is used to simulate the pile and soil interaction by viscoelastic plasticity and non- linear spring element, set up a numerical model for the pile penetration process, and analyze the main influencing factors on pile drivability under the ac- tion of vibratory hammer combining a offshore pil- ing operation in Bohai sea, such as dynamic soil strength reduction coefficient, excited frequency, penetration depth, soil plugging and so on. This method is convenient to research drivability while pile driving into different depth. It has guiding sig- nificance for the practical engineering.