摘要
为了研究桩底沉渣性质对成层粘弹性土中大直径灌注桩动力响应的影响。首先,将桩底沉渣看作虚土桩,并引入Rayleigh-Love杆模型建立桩及虚土桩纵向振动控制方程,以近似考虑大直径灌注桩的三维效应;然后,基于三维轴对称模型建立桩周土纵向振动控制方程;求解桩-土体系振动控制方程,并结合Laplace变换、阻抗函数递推、Fourier逆变换等方法,得到桩顶频域及时域响应理论解;基于所建立的理论解答,揭示大直径灌注桩三维波动效应的规律,并分析桩底沉渣性质对其动力响应的影响;最后,通过与实测结果的对比验证该解的可靠性。
The influence of the properties of the sediment on the dynamic response of the large diameter bored pile embedded in layered visco-elastic soil is analyzed in this study. First, the sediment is considered as a fictitious soil pile and the Rayleigh-Love rod theory is introduced to establish the longitudinal dynamic governing equations for the pile and the fictitious soil pile to approximately consider the three-dimensional effect of the pile. Then, the dynamic governing equation for the surrounding soil is built based on the three-dimensional axisymmetric model. By means of Laplace transform, impedance function recursion and inverse Fourier transform, the dynamic governing equations for the soil-pile system are solved to derive the solutions for the dynamic response of the pile in the frequency and time domain. Based on the established solution, the three-dimensional effect of the large diameter bored pile is portrayed and the influence of the properties of the sediment on the dynamic response of the pile is investigated. Finally, the reliability of the proposed solution is verified by comparing with the measured results.
作者
吴鸿昇
刘勇
蔡辉敏
白钒
李斌
李方林
刘坚
WU Hongsheng;LIU Yong;CAI Huimin;BAI Fan;LI Bin;LI Fanglin;LIU Jian(State Grid Jiangsu Power Engineering Consulting Limited Company,Nanjing,Jiangsu 210036,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing,Jiangsu 210098,China)
出处
《河北工程大学学报（自然科学版）》
CAS
2022年第3期7-15,共9页
Journal of Hebei University of Engineering:Natural Science Edition
基金
国网江苏省电力工程咨询有限公司科技项目(J2021006)
国家青年科学基金资助项目(51608152)。
作者简介
吴鸿昇(1989-),男,江苏南京人,硕士,工程师,研究方向:岩土工程与结构工程;通讯作者:刘坚(1986-),男,江苏淮安人,博士研究生,副教授,研究方向:基础工程与地基处理。
