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Dobry和Gazetas分析群桩振动特性的理论是将土体视为单相介质提出的,对于饱和土中桩-桩相互作用和群桩振动是否适用有待验证。将土体视为液固两相多孔介质,运用Novak薄层法和引入势函数的方法,求解了饱和土层的水平动力阻抗和自由场水平位移衰减函数,并在初参数法的基础上求解了桩-桩水平动力相互作用因子,运用基于动力相互作用因子的叠加原理对饱和土中群桩的水平振动进行了分析,并以3×3桩为例对群桩动力阻抗的主要影响参数进行了分析。提供了一种分析饱和土中桩-桩动力相互作用和群桩动力阻抗的新方法。
Dobry and Gazetas’ theory of pile group vibration is proposed by considering the soil as a single-phase medium. It is yet to be verified whether the pile-pile interaction and pile group vibration are suitable for saturated soil. The soil is regarded as a liquid-solid two-phase porous medium. The Novak thin-layer method and the potential function are introduced to solve the horizontal dynamic impedance and free-field horizontal displacement attenuation function of saturated soil. Based on the initial parameter method, The horizontal dynamic interaction factors of pile-pile are analyzed. The horizontal vibration of pile group in saturated soil is analyzed based on the principle of superposition of dynamic interaction factor. The main influence parameters of pile group dynamic impedance are analyzed with 3 × 3 pile as an example Analysis. A new method of analyzing pile-pile dynamic interaction and pile group dynamic impedance in saturated soil is provided.