摘要
为进一步研究群桩基础水平累积变形特性,以及桩体自身因素、荷载因素、桩周土体因素等影响下的变化规律,结合USDFLD子程序的实现过程与ABAQUS三维建模过程,采用有限元计算结果对群桩累积变形特性进行研究。通过改变桩距、桩数、荷载入射角度、加载频率、土体初始弹性模量、桩-土界面摩擦系数等参数,进一步对群桩水平累积变形特性,及其在桩体自身因素、荷载因素、桩周土体因素等影响下的变化规律进行研究。数值模拟中经常忽略桩周土体弱化对群桩基础累积变形特性的影响,因此对如何在数值模型中实现土体软化也进行了研究。最终得到群桩水平累积变形特性,以及在各种影响因素下的变化规律,如在桩体自身因素的影响下,群桩承台水平累积变形随桩距与桩数的增加不断减小,荷载-位移滞回圈随桩数的减少越饱满,土体非线性越明显等变化规律。
To further study the horizontal cumulative deformation characteristics of pile group foundation,as well as the variation patterns under the influence of factors such as the pile itself,load factors and soil around piles,this paper combines the implementation process of USDFLD subroutine and ABAQUS three-dimensional modeling process to study the cumulative deformation characteristics of pile groups using finite element calculation results.By changing parameters such as pile distance,pile number,load incidence angle,loading frequency,initial elastic modulus of soil,pile-soil interface friction coefficient and other parameters,the horizontal cumulative deformation characteristics of pile groups are further studied,and the variation rules under the influence of factors such as pile itself,load factor and soil around pile.The effect of soil weakening around piles on the cumulative deformation characteristics of pile group foundation is often ignored in numerical simulation.Therefore,this article also studies how to achieve soil softening in numerical model.Finally,the horizontal cumulative deformation characteristics of pile groups and the variation rules under various influencing factors are obtained.For example,under the influence of pile body itself,the horizontal cumulative deformation of pile caps decreases with the increase of pile distance and pile number,the load-displacement hystericity ring becomes fuller with the decrease of pile number,and the soil nonlinearity becomes more obvious.
作者
王多银
李国洋
王丽
段伦良
唐选海
吴穗庆
杜文力
WANG Duoyin;LI Guoyang;WANG Li;DUAN Lunliang;TANG Xuanhai;WU Suiqing;DU Wenli(Hehai College of Chongqing Jiaotong University,Chongqing 400074,China;National Technical Research Center for Inland Waterway Regulation Engineering,Chongqing 400074,China)
出处
《水运工程》
2024年第9期48-56,共9页
Port & Waterway Engineering
关键词
群桩基础
水平循环荷载
累积变形
三维数值
pile group foundation
horizontal cyclic load
cumulative deformation
three-dimensional numerical
