群桩刚性承台竖向动阻抗的简化计算

目前对群桩动阻抗研究的文献 ,始终局限在刚性承台底与土脱离的假设 ,而没有考虑实际存在的承台底与土接触的情况。文中在对群桩刚性承台动阻抗的求解过程中 ,首次考虑了承台底土与承台及群桩的动力相互作用。文中首先利用前期文献确定了单桩和单独刚性基础在均质弹性土中的竖向动阻抗 ,然后定义了桩 -土、土 -桩、土 -土动力相互作用因子的概念 ,并对诸动力相互作用因子作了理论推导及计算 ,进而建立了均匀介质中群桩竖向动力阻抗的简化计算方法。

Simple method for calculating vertical dynamic impedance of rigidly-capped pile groups

Dynamic impedances of pile groups have been studied almost on a same assumption that rigid caps and soil under it do not touch each other in the current literature.This paper account for the dynamic impedance of pile groups without the aboved-mentioned assumption. So, that the soil under caps affects the caps and piles is discussed.In the paper,first, dynamic impedance of the single pile and the single rigid foundation are derived in homogeneous elastic media. Then, the pile-to-soil, soil-to-pile and soil-to-soil dynamic interaction factors are defined and worked out. And a simple method for calculating vertical dynamic impedance of rigidly-capped pile groups in homogeneous elastic media is developed.