基于Biot提出的饱和多孔介质的波动方程，研究了均质各向同性饱和土中端承管桩的扭转振动问题。首先对土层动力平衡方程进行求解并得到土体扭转振动位移形式解，然后对管桩的动力平衡方程进行求解，得到了管桩桩顶转角解析解，进一步通过数值算例分析了桩周土与桩芯土的物理力学参数对管桩桩顶复刚度和桩身转角的影响。数值分析结果表明，在动力基础设计所关注的低频段，桩周土与桩芯土的剪切模量比、壁厚以及桩的长径比对管桩的动力响应有较大的影响，而液固耦合系数的影响很小。
Abstract
Based on Biot’s dynamic wave equation for porous-saturated soil, the response of an end bearing pipe pile embedded in homogeneously isotropic saturated soil and subjected to a transient torsional loading is theoretically investigated. At first, the vibration displacement solution of the saturated soil is solved. By utilizing the continuity and boundary conditions of the pile-soil system, the dynamic response of the twist angle of the pipe pile is obtained in a closed form. Finally, the influence of major parameters on the complex stiffness of pile top and the twist angle of the pipe pile is investigated. It is shown that, in the low-frequency stage which focused by dynamic foundation design, the modulus ratio of soil around pile and inner soil, the thickness and the slenderness of pipe pile have a distinct influence on the dynamic response of pile. But the influence of the coupled coefficient of fluid and solid phase can be neglected.
关键词
管桩 /
饱和土 /
桩土相互作用 /
扭转振动 /
转角
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Key words
Pipe pile /
Saturated soil /
Pile-soil interaction /
Torsional vibration /
Twist angle
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参考文献
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