饱和土中桩-桩竖向动力相互作用因子研究

Study on Pile-Pile Vertical Dynamic Interaction Factor in Saturated Soil

桩桩动力相互作用的研究是研究群桩动力阻抗的基础,而桩桩动力相互作用通常利用动力相互作用因子来反映。将饱和土视为液固两相介质,利用薄层法得到了饱和土的竖向动力阻抗,进而得到饱和土中桩桩竖向动力相互作用因子。通过分析桩土力学参数对竖向动力相互作用因子的影响发现:桩间距、耦合系数、桩土模量比等参数对竖向动力相互作用因子有较大的影响,液固耦合系数较大时也有一定的影响。

Study of dynamic impedances of pile groups is based on the analysis of pile-pile dynamic interaction, which is reflected by the pile-pile dynamic interaction factor. Regarding the saturated soil as a two-phased medium, the vertical dynamic impedance of the saturated soil is obtained using the delami- nation method. Then, the pile-pile dynamic interaction factor is obtained. Through the analysis of the influence of pile and soil parameters on the vertical dynamic interaction factor, it is found that the distance between piles and the modulus ratio of pile to soil have great influence on vertical pile-pile dynamic interaction factor, and large solid-fluid coupling coefficient also has some influence on it.