【摘要】 由于饱和土中孔隙水的流动特性以及桩基与土体的不同渗透率,饱和土与单相土中桩基的力学行为,尤其是动力学行为存在很大差异。运用Novak薄层法和引入势函数的方法,得到了饱和土层的竖向动力阻抗和自由场竖向位移衰减函数,在此基础上研究了饱和土中桩-桩的竖向动力相互作用及群桩的竖向动力阻抗问题。分析讨论了桩土力学参数对饱和土中群桩竖向动力阻抗的影响。研究表明:桩间距、液固耦合系数、桩土模量比等参数对桩-桩竖向相互作用和群桩竖向动力阻抗有影响,研究成果对于桩基动力检测和抗震设计具有较大的实际应用价值。更多还原

【Abstract】 The mechanical properties,especially dynamic behaviors of the pile in saturated soil and single-phase soil are significantly different due to the flow quality of pore water in saturated soil and the difference in the porosity of soil and pile.The vertical impedance of saturated soil and the attenuation function of displacement of free field were obtained by using layer method and potential functions.The interaction of pile to pile and the vertical impedance of pile groups in saturated soil were investigated.The results indicated that the distance between piles,force factor of fluid phase and solid phase,modulus ratio of pile and soil affected vertical dynamic impedance of pile groups in saturated soil.The study of the pile in saturated soil provided significant help for dynamic inspection and design of pile.更多还原