【摘要】 提出了分层地基中考虑轴向力参与作用下群桩水平阻抗的分析方法,进一步揭示了群桩-土相互作用的振动特性,拓展了桩基阻抗简化法的应用范围。群桩动力反应不等同于其独立单桩的简单叠加,其频率阻抗曲线形状与桩数、竖向力、土层属性、桩间距有关,受布桩型式的影响最大,随桩距径比的增大群桩效应有衰减趋势;桩顶轴力的存在使群桩水平反应与单一水平力作用时有明显差异,增大了群桩水平变位。更多还原

【Abstract】 A method for analysing lateral dynamic resistance of pile-groups is presented considering the participation of axial loads on pile-head in layered-soil and the vibration characteristic of soil-pile-groups is further revealed to extend the application scope of simplified pile-resistance method.The dynamic frequency-dependent response of pile-groups is characterized by random configuration,pile number,soil properties and interval between piles,instead of the simple addition of each single-pile resistance.The pile-group effect is mostly affected by allocation type of piles and will attenuate with the increase of R/D ratio between piles.In addition,the corresponding dynamic with vertical loads is obviously different from that under pure lateral excitation,which results in augments of lateral responses of pile-groups.更多还原