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由于桩土间的相对位移,桩身上会产生正摩擦和负摩阻力。工程中由于负摩阻力产生的下拉荷载不仅使桩竖向承载力减小,还会导致结构物的不均匀沉降。鉴于此,提出了在桩身负摩阻力范围内加涂层的方法,并使用有限元程序ABAQUS验证了该方法的有效性。模型首先用来测试桩承受轴向荷载时桩的承载性能,在达到满意的结果之后,再用来分析涂层分布范围和涂层材料对桩身摩阻力的影响。基于分析数据,作出相应的图表预测桩身摩阻力的变化,结果表明桩身涂层可以有效减小负摩阻力,提高桩的整体承载力。
Due to the relative displacement between pile and soil, the pile body will produce positive friction and negative friction. The negative pull-off load due to negative friction in the project not only reduces the vertical bearing capacity of the pile, but also leads to the uneven settlement of the structure. In view of this, a method of adding coating in the range of negative skin friction is proposed, and the validity of this method is verified by the finite element program ABAQUS. The model is first used to test the bearing capacity of the pile when the pile is subjected to axial load. After the satisfactory results are obtained, the model is used to analyze the distribution range of the coating and the influence of the coating material on the pile friction. Based on the analysis data, a corresponding chart is made to predict the variation of the pile body resistance. The results show that the pile coating can effectively reduce the negative friction and increase the overall bearing capacity of the pile.