冲刷条件下桩基础水平承载特性非线性分析  

Nonlinear analysis of horizontal bearing characteristics of pile foundation under scouring condition

作　　者：纠永志[1,2] 薛营 高海权 祝彦知[1,2] JIU Yongzhi;XUE Ying;GAO Haiquan;ZHU Yanzhi(College of Architectural Engineering,Zhongyuan University of Technology,Zhengzhou 450007,Henan,China;Architectural Design and Research Institute,Zhongyuan University of Technology,Zhengzhou 450007,Henan,China)

机构地区：[1]中原工学院建筑工程学院,河南郑州450007 [2]中原工学院建筑设计研究院,河南郑州450007

出　　处：《水利水电技术（中英文）》2023年第5期84-94,共11页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(51608548)。

摘　　要：水域环境中的桩基础面临水流冲刷的威胁,水流冲刷将会引起基桩周围土体的流失,【目的】为研究冲刷对桩基础水平承载特性的影响,建立冲刷条件下桩基础水平承载特性简化分析方法。【方法】首先构建了桩周土体整体冲刷条件下的p-y曲线模型;然后基于p-y曲线法,采用有限差分法建立了冲刷条件下水平受荷桩非线性简化分析方法,对不同桩径、不同冲刷深度条件下桩基础水平承载特性进行计算分析,并与有限元结果对比验证了简化方法的正确性。【结果】结果显示:随着冲刷深度的增大,水平受荷桩的侧向刚度和水平承载力逐渐降低;相同水平荷载下随着冲刷深度的增加,桩顶水平位移和桩身最大弯矩逐渐增大,并且桩身最大弯矩所处位置逐渐向下移动。【结论】结果表明:水流冲刷引起基桩周围土体的流失将会对基桩水平承载特性产生显著影响,上述简化方法可为冲刷条件下水平受荷桩基的设计提供理论分析工具。The pile foundation in the water environment is threatened by water scouring,which will cause the loss of soil around the pile.[Objective]In order to study the impact of scouring on the horizontal bearing characteristics of the pile foundation and establish a simplified analysis method for the horizontal bearing characteristics of the pile foundation under scouring conditions,[Methods]firstly,the p-y curve model of the soil around the pile under the whole scouring condition is constructed;Then,based on the p-y curve method,a simplified nonlinear analysis method of horizontally loaded piles under scouring conditions is established by using the finite difference method.In addition,responses of a single pile with different pile diameters and different scour depths under horizontal load are studied by the simplified method.In order to verify its validity,by comparing the calculated result via the present method with the finite element result,good agreement is achieved.[Results]The result show that with the increase of scouring depth,the lateral stiffness and horizontal bearing capacity of horizontally loaded piles gradually decrease.With the increase of scouring depth under the same horizontal load,the horizontal displacement of pile top and the maximum bending moment of pile gradually increase,and the position of the maximum bending moment of pile gradually moves downward.[Conclusion]The above research shows that the loss of soil around the pile caused by water scouring will have a significant impact on the horizontal bearing characteristics of the pile.The above simplified method can provide a theoretical analysis tool for the design of horizontally loaded pile foundation under scouring conditions.

关 键 词：桩基础 冲刷 P-Y曲线 水平承载特性 非线性 

分 类 号：TU473.1[建筑科学—结构工程]