土塞效应对饱和土中外露管桩纵向振动影响  

The influence of part soil plugging on vertical vibration of part exposed pipe pile in saturated soil

作　　者：刘林超[1] 闫启方[1] 

机构地区：[1]信阳师范学院土木工程学院,河南信阳464000

出　　处：《扬州大学学报（自然科学版）》2016年第2期57-61,共5页Journal of Yangzhou University：Natural Science Edition

基　　金：国家自然科学基金资助项目(U1504505);河南省科技发展计划资助项目(142300410200);河南省高等学校青年骨干教师资助项目(2013GGJS-121);信阳师范学院南湖学者奖励计划资助项目(201506)

摘　　要：考虑管桩周围饱和土层和桩芯饱和土层的竖向位移,分析了单位厚度管桩周围饱和土和桩芯饱和土对管桩的作用力,建立了在饱和土中考虑土塞效应时部分外露管桩纵向振动的控制方程,并运用传递矩阵法求得了管桩纵向振动的桩顶复刚度.计算结果表明:管桩壁厚较小时,减小壁厚对复刚度的影响不大,但管桩不宜过薄;土塞深度、管桩周围饱和土与桩芯饱和土剪切模量比对管桩纵向振动有较大影响,且影响规律与频率有关.The forces of unit thickness saturated soil around pile and pile core saturated soil on pipe pile are obtained only considering the vertical displacements, and the vertical dynamic control equations of part exposed pipe pile in saturated soil considering part soil plugging effect are also estab- lished. The complex stiffness at pile head of pipe pile in saturated soil considering part soil plugging effect is obtained by using transfer matrix method. The numerical example indicates that the decreasing of wall thickness of pipe pile has not great effect on the complex stiffness when the wall thickness of the pipe pile is small, and the wall thickness of pipe pile should not be too thin; the depth of soil plug part, and the shear modulus ratio of saturated soil around pile and pile core saturated soil have great effect on the vertical vibration of part soil plug part exposed pipe pile in saturated, and the influence rules are related with frequency.

关 键 词：土塞效应 饱和土 管桩 纵向振动 复刚度 

分 类 号：TU435[建筑科学—岩土工程]