SH简谐波作用下桩土横向动力相互作用解析分析

Analysis on Pile-soil Lateral Dynamic Interaction under SH Harmonic Wave Excitation

利用波的传播理论得到了SH简谐波作用下土层的位移,采用动力Winkler地基梁模型模拟桩-土之间的动力相互作用,得到了SH简谐波作用下单桩的横向位移。通过放大因子来反映SH简谐波作用下桩土系统的横向振动特性,分析了桩土主要力学参数对放大因子的影响。研究表明,桩顶放大因子随频率的变化曲线主要存在4个峰值,土体粘滞阻尼系数对第一个峰值有较大影响;在低频和高频情况下,长径比和边界条件对放大因子的影响不同。对SH作用下桩基振动特性的研究为桩基抗震设计提供了依据。

The displacement of soil caused by SH harmonic waves was obtained by the theory of wave propagation,the effect of pile-soil interaction was simulated by using dynamic Winkler beam model,and the lateral displacement of single pile in soil caused by SH harmonic waves was obtained.The amplification factor was used to describe the lateral vibration characteristics of pile-soil system under SH harmonic wave excitation,and the influence of the main parameters of pile-soil system on amplification factor was analyzed.The results indicate that（1） there are four peak values of the amplification factor varying with frequency,and the damping coefficient of soil has great effect on the first peak value;（2） the influences of length-radius ratio and boundary conditions on the amplification factor are different at lower and higher frequencies.The study of the dynamic properties of the pile under SH harmonic wave excitation provided a reference for seismic design of pile.