滨海软弱土层中混凝土桩基水平承载性能分析

Analysis of horizontal bearing capacity and stability of concrete pile foundation in coastal soft soil

为探究水平荷载及竖向荷载组合作用下在役混凝土长桩的水平承载性能,以大连万科海港城项目为工程依托,利用有限元软件ABAQUS进行了数值模拟,并在此基础上采用“m法”进行理论验证,将两类计算结果对比分析;探究了在水平、竖向荷载作用下,桩侧不同地基土层对桩体承载能力的影响,以及在桩侧土体类型改变处(自地面以下6m、15m、27m)桩体侧移、剪力、弯矩曲线的变化情况;分析表明,不同地基土层对长桩工作性状影响较大,水平荷载的增加会加速桩身的沉降,使沉降量曲线呈抛物线下降趋势,研究结论可为超厚淤泥土层中水平受荷桩计算提供参考依据。

In order to explore the horizontal bearing performance of long concrete piles in service under the combined action of horizontal load and vertical load,the finite element software ABAQUS was used to conduct numerical simulation based on Dalian Vanke Harbor City project.On this basis,the"m method"was used to conduct theoretical verification,and the two kinds of calculation results were compared and analyzed.The influence of different soil layers on pile bearing capacity under horizontal and vertical loads is explored,as well as the changes of pile lateral displacement,shear force and bending moment curve at the change of soil type(from 6m,15m,27m below the ground).The analysis shows that different soil layers have a great influence on the working behavior of long piles.The increase of horizontal load will accelerate the settlement of pile and make the settlement curve show a parabolic downward trend.The research conclusion can provide reference for the calculation of horizontal piles under load in ultra-thick silt soil.