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利用ADINA非线性有限元软件,考虑桩土相互作用,建立了单桩三维数值模型,分析了桩侧堆载作用下负摩阻力的形成过程,研究了桩项荷载作用下桩身荷载传递、桩侧摩阻力分布、中性点位置、桩顶附加沉降的变化规律以及桩顶荷载和堆载的施加顺序对桩侧负摩阻力的影响。分析结果表明:随着桩顶荷载增大,桩侧负摩阻力逐渐减小,中性点明显上移,由桩侧负摩阻力产生的下拽力增加的速率变小,而桩顶附加沉降速率呈现逐渐增长的趋势;桩侧负摩阻力的大小受桩顶荷载和堆载施加顺序的影响,桩顶荷载先于堆载施加则产生的负摩阻力最大,而采用相反的加载顺序,产生的负摩阻力最小,甚至消失。所得结论对工程设计过程中负摩阻力的计算提供参考。
Taking ADINA nonlinear finite element software as an example, considering the pile-soil interaction, a three-dimensional numerical model of single pile was established. The forming process of negative friction was analyzed. The pile load transfer, pile load transfer, Side frictional resistance distribution, neutral point position, additional settlement of pile top and the influence of pile top load and pile loading order on negative friction of pile side. The results show that with the increase of pile top load, the negative friction resistance of pile side gradually decreases and the neutral point moves up obviously. The rate of increase of drag force caused by negative friction of pile side decreases, while additional settlement of pile top The rate of negative skin friction showed a trend of increasing gradually. The magnitude of negative skin friction on the pile side was affected by the pile top loading and stacking loading order. The negative skin friction was the highest when the pile top load was applied under the load. The negative friction of the smallest, or even disappear. The conclusions obtained provide reference for the calculation of negative friction in engineering design.