基于叠加原理的群管桩的纵向振动  

Vertical vibration of pipe pile groups based on the principle of superposition

作　　者：刘林超[1] 牛洁楠 肖琪聃[1] 闫启方[1] 

机构地区：[1]信阳师范学院建筑与土木工程学院,信阳464000

出　　处：《应用力学学报》2017年第3期534-540,共7页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(U1504505);河南省科技发展计划项目(142102210063);河南省高等学校重点科研项目(15A560036);河南省高等学校青年骨干教师资助计划项目(2013GGJS-121);信阳师范学院南湖学者奖励计划青年项目(201506);信阳师范学院重大课题预研项目(2013ZDYY19)

摘　　要：利用Winkler地基模型来模拟管桩与桩周土、管桩与桩芯土的动力相互作用,在忽略桩周土、桩芯土的径向、环向位移的情况下,得到了Winkler地基模型的刚度系数和阻尼系数。在Winkler地基模型的基础上建立了主动管桩和被动管桩的纵向振动方程,将相互作用因子的概念扩展应用到管桩-管桩纵向动力相互作用,得到了管桩-管桩纵向动力相互作用因子。在叠加原理和管桩-管桩动力相互作用因子的基础上,求解了管桩的纵向振动,得到了管桩的纵向动力阻抗。通过数值算例分析了相关参量对管桩-管桩纵向动力相互作用和群管桩纵向振动的影响。研究结果表明:管桩内外半径比、桩土剪切模量比、管桩长径比对管桩-管桩纵向动力相互作用和群管桩纵向振动有较大的影响,桩间距较大时管桩-管桩纵向动力相互作用因子和群桩动力阻抗随频率变化曲线波动越大;管桩壁厚不宜过薄。The dynamic interaction between pipe pile and the outer and inner soil is modeled by Winkler model,and the stiffness and damping coefficients of Winkler model are obtained by neglecting the radial and circumferential displacement,of outer and inner soil.The vertical vibration equations of active pipe pile and passive pipe pile are established based on the Winkler model.The pipe pile-pipe pile vertical dynamic interaction factor is obtained by extending the concept of interaction factor to the pipe pile-pipe pile vertical dynamic interaction.The vertical vibration of pipe pile groups is solved and the vertical dynamic impedance is also obtained based on the principle of superposition and pipe pile-pipe pile dynamic interaction factor.The influences of related parameters on pipe pile-pipe pile dynamic interaction factor and vertical vibration of pipe pile groups are investigated by numerical examples.The result indicates that the inner and outer radius ratio of pipe pile,the shear modulus ratio of pile and soil,ratio of length to diameter have great effects on the pipe pile-pipe pile dynamic interaction and the vertical vibration of pipe pile groups,the curves of pipe pile-pipe pile vertical dynamic interaction factor and vertical dynamic impedance of pipe pile groups varying with frequency fluctuate more largely when the pile spacing is more large;and the wall thickness of pipe pile should not be too thin.

关 键 词：管桩 纵向振动 叠加原理 动力相互作用 

分 类 号：TU435[建筑科学—岩土工程]