饱和土中桩水平振动引起土层复阻抗分析研究

Study of resitance factor of saturated soil caused by horizontal vibration of pile

基于Biot动力固结方程,研究了饱和土中端承桩在水平振动时产生的土层复阻抗特性。对动力固结方程进行变型,采用算子分解及分离变量法得到简谐稳态水平振动下土层复阻抗动力响应的解析解。将该解与等效单相解以及单相解进行了对比,并阐明各解之间的关系,指出可等效成等效单相解的条件。通过参数分析,剖析了渗透系数、桩土模量比和桩长径比对土层阻抗的影响。

Based on Biot＇s consolidation equation,the characteristics of the resistance of soil caused by horizontal vibration of elastic bearing pile embedded in saturated soil are analytically studied. Transforming the consolidation equation, by virtue of differential operator splitting and variable separation method, the horizontal dynamical characteristics of soil under steady state of pile-soil interaction are obtained. The comparisons with the equivalent sing/e-phase solution and the sing/e-phase solution are presented; and the condition of the solution that can be equivalent to the equivalent single-phase solution is indicated. A parametric study is conducted to determine the main features of pile-soil interaction in horizontal vibration, the effects of the permeability coefficient, the pile-soil modulus ratio and the pile slenderness on resistance of soil layer are studied.