倾斜荷载作用下低裙式吸力桩承载特性数值模拟研究  

Numerical Simulation Study of Bearing Characteristics of Low Skirted Suction Piles under Inclined Loads

作　　者：苏敏[1] 鹿群[1] 姜寒[1] 柳晓科 SU Min;LU Qun;JIANG Han;LIU Xiaoke(Tianjin Chengjian University,Tianjin 300384,China;North China Municipal Engineering Design and ResearchInstitute Co.,Ltd,Tianjin 300381,China)

机构地区：[1]天津城建大学,天津300384 [2]中国市政工程华北设计研究总院有限公司,天津300381

出　　处：《天津城建大学学报》2020年第6期409-415,共7页Journal of Tianjin Chengjian University

摘　　要：为了研究低裙式吸力桩的承载特性,首先将某文献中模型试验的数据用PLAXIS 3D进行模拟,证明模拟的可行性与正确性.然后通过有限元数值分析,详细讨论了倾斜荷载作用下,低裙式吸力桩处于极限平衡条件下的受力状态.最后得出倾斜荷载作用下,不同加载点位置与加载角度对低裙式吸力桩受力和变形的影响规律:随着加载点位置从桩顶板到桩端的移动,承载力先增大后减小,且发生平动破坏的2L/3或3L/4处为最佳加载位置,承载力达到最大;随着角度的增大,承载力逐渐减小,加载角度为60°以上时,加载点位置的改变对桩体的承载力基本无影响.同时分析了加载点位置与角度对旋转中心位置的影响,此外,还发现裙径与裙高,以及土性的改变对最佳加载点位置基本无影响.In order to study the bearing characteristics of the low skirted suction pile,first,the data of the model test in a literature is simulated with PLAXIS 3D.The simulation and test curves have the same trend which proves the feasibility and correctness of the simulation.Then,through the finite element numerical analysis,the stress state of low-skirt suction pile under the action of inclined load and the condition of ultimate equilibrium is discussed in detail,and the influence law of different loading points and loading angles on the stress and deformation of lowly skirted suction pile under the action of inclined load is obtained:As the loading point moves from the pile top to the pile end,the bearing capacity first increases and then decreases,and 2L/3 or 3L/4 where the translational failure occurs is the optimal loading position,reaching to the maximum bearing capacity.As the angle increases,the bearing capacity decreases gradually.When the loading angle is above 60°,the change of the loading position has no effect on the bearing capacity of the pile.At the same time,the influence of the position and the angle of the loading on the position of the rotating center is analyzed.In addition,it is also found that the skirted diameter and height,as well as the change of soil properties have little effect on the optimal loading position.

关 键 词：低裙式吸力桩 倾斜荷载 加载位置 加载角度 抗拔承载力 

分 类 号：TU473.11[建筑科学—结构工程]