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结合某桥梁桩基试验项目,对2根大直径PHC桩进行竖向承载力静载试验,并通过桩身预埋的应变式钢筋计测试桩身轴力分布。试验结果表明,桩侧土层刚度越大,桩顶荷载传递给该层土体承担的比例也越大,桩身轴力减小也越显著,反之,则桩顶荷载更多向下部土层传递;桩身上部土层的侧阻力先于下部土层发挥作用,且较大的荷载将使上部桩土发生较大相对位移,从而导致淤泥层侧摩阻力发生软化现象;尽管大直径PHC桩桩身刚度较大,但在设计工作荷载下,试验的桩顶实测沉降主要由桩身压缩引起。
Combined with a bridge pile foundation test project, two large diameter PHC piles are subjected to static load test of vertical bearing capacity, and the axial load distribution of the pile body is measured by the strain gauge steel bar embedded in the pile body. The test results show that the greater the stiffness of soil layer on the pile side, the greater the proportion of load transferred to the soil layer by the pile top and the more significant the axial force of the pile is reduced. On the contrary, The lateral resistance of the soil in the upper part of pile body precedes that in the lower soil layer and the larger load will make the relative displacement of the upper pile soil occur and lead to softening of the frictional resistance of the silt layer. The stiffness of the pile body is large, but under the design working load, the measured settlement of the pile top is mainly caused by the compression of the pile body.