信阳师范学院学报（自然科学版）2017，Vol.30Issue(4)：651-657,7.DOI:10.3969/j.issn.1003-0972.2017.04.030
基于动力相互作用因子的饱和土中群管桩的纵向振动研究
Study on Longitudinal Vibration of Pipe Pile Groups in Saturated Soil Based on Dynamic Interaction Factor
摘要
Abstract
The dynamic interactions between the saturated soil around the pile and the pipe pile, and between the pile inner saturated soil and the pipe pile were modeled by the dynamic Winkler spring-damper. In the case of ignoring the radial and circumferential displacement of pipe pile, the saturated soil around the pile was supposed be composed by the infinite thin soil layers with a round hole, and the pile inner saturated soil was regarded as be composed by the infinite circular thin soil layers, and the stiffness coefficient and damping coefficient of the dynamic Winkler spring-damper model were obtained by means of mathematics and physics. The vertical displacements of active pipe pile and passive pipe pile in the saturated soil were obtained by using the initial parameter method and the transfer matrix meth-od, and the longitudinal dynamic interaction factor of pipe pile and pipe pile in the saturated soil was also got. Based on the principle of superposition of pile groups and the vertical dynamic interaction factor of pipe pile and pipe pile, the vertical dynamic impedance of pipe pile groups in the saturated soil was also obtained. The numerical analysis showed that: the curves of the longitudinal dynamic impedance of pipe pile groups will fluctuate more severe with the frequency when the pile spacing is bigger. The amplitude changes of the curves of the longitudinal dynamic impedance will be big-ger with the frequency when the inner radius and the ratio of length to diameter are bigger, while the amplitudes will be smaller when the modulus ratio of the pipe pile and the saturated soil is bigger. The influence of pile spacing on the dy-namic stiffness of pipe pile groups is the largest, followed by the ratio of length to diameter, and the modulus ratio of pipe pile and saturated soil is the smallest.关键词
饱和土/群管桩/纵向振动/动力相互作用因子/动力阻抗Key words
saturated soil/pipe pile groups/longitudinal vibration/longitudinal dynamic interaction factor/dy-namic impedance分类
建筑与水利引用本文复制引用
闫启方,刘林超,牛洁楠..基于动力相互作用因子的饱和土中群管桩的纵向振动研究[J].信阳师范学院学报（自然科学版）,2017,30(4):651-657,7.基金项目
国家自然科学基金项目(U1504505) （U1504505）
河南省科技发展计划项目(172102210453) （172102210453）
河南省高等学校青年骨干教师资助计划项目(2013GGJS-121) （2013GGJS-121）
信阳师范学院南湖学者计划青年项目(201506) （201506）
