摘要
近海结构单桩基础一般会遭受到多种水平动力荷载作用。针对端承桩在桩顶水平动力荷载作用下的动力响应问题,建立了一种三维水-桩-土相互作用系统模型;首先,桩和土体假设为线黏弹性介质,水体假设为线性声学介质;然后通过亥姆霍兹分解和分离变量法,给出了水体和土体阻抗对水-桩-土相互作用系统中桩体动力响应的解析解,进一步根据桩与水体、土体接触界面的连续条件,得到频域下桩体位移表达式。通过与子结构方法进行对比,验证了本文解析解的合理性;最后研究了不同桩体和土体参数时水体对桩体顶部位移响应的影响。结果表明,在海上桩基设计中考虑水-桩-土相互作用是非常有必要的。
Offshore structures of a single pile are generally subjected to a variety of horizontal dynamic loads. In order to study the dynamic response of end-supported piles under horizontal dynamic loads on pile head, a three-dimensional water-pile-soil interaction system model is established. The pile and soil are assumed to be a linear viscoelastic media, and the water is assumed to be a linear acoustic media. Through the Helmholtz method for decomposition and separation of variables, an analytical solution is obtained for the resistance of the soil layer and water media to the water-pile-soil system. The displacement and horizontal dynamic complex impedance of the pile are then obtained in frequency domain based on the continuity conditions of contact interface between the pile and water and soil. The present solution is compared with the substructure method to verify the rationality of the method. Finally, the influences of water on the displacement response of pile top under different pile and soil parameters are studied. The results indicate that it is necessary to consider the water-pile-soil interaction in the design of the piles installed in offshore areas.
作者
赵密
黄义铭
王丕光
徐海滨
杜修力
ZHAO Mi;HUANG Yi-ming;WANG Pi-guang;XU Hai-bin;DU Xiu-li(Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China;China Three Gorges Corporation,Beijing 100038,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2022年第5期907-915,I0006,共10页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金面上项目(52078010)
教育部创新团队项目(IRT_17R03)。
关键词
近海结构
解析解
水平振动
桩-水相互作用
桩-土相互作用
offshore structure
analytical solution
horizontal vibration
pile-water interaction
pile-soil interaction
作者简介
赵密(1980-),男,博士,教授,博士生导师,主要从事重大工程抗震领域研究工作,E-mail:zhaomi@bjut.edu.cn;通信作者:王丕光(E-mail:wangpiguang1985@126.com)。
