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针对夯实水泥土桩的施工方法,在桩身埋设特制的应变传感器,测定桩身应变。基于试验测试数据,探讨桩身压缩量的计算方法,分析桩身压缩变形的分布规律及其对桩侧摩阻力的影响,并探讨不同桩长、不同水泥掺入比情况下,夯实水泥土桩桩身压缩量及其对承载特性的影响。研究表明,(1)对夯实水泥土桩,桩身压缩主要集中在桩身上部8 d(d为桩径)范围内,且变形速率变化较大,桩身压缩在桩顶位移中占比达80%以上;(2)桩身轴向荷载传递、桩侧摩阻力分布主要发生在此范围内;(3)桩身侧摩阻力分布非常不均匀,上部发挥较为充分,而下部发挥较少;(4)在工程常用水泥掺入比下,桩长大于12 d后,桩长径比和水泥掺入比的变化对桩承载特性影响不显著。
According to the construction method of compacted cement-soil piles, a special strain sensor is embedded in the pile body and the strain of the pile body is measured. Based on the test data, the calculation method of pile compression is discussed. The distribution rule of pile deformation and its influence on pile friction are analyzed. With different pile lengths and different cement incorporation ratios, The amount of pile body compression and its influence on bearing characteristics. The results show that: (1) For the compacted cement-soil pile, the compression of the pile mainly concentrates in the upper part of the pile for 8 d (d is the diameter of the pile), and the deformation rate changes greatly. The compression of the pile body accounts for about 80%. (2) Axial load transfer of pile and distribution of frictional resistance of pile mainly occur in this range. (3) The distribution of frictional resistance of pile body is very uneven, the upper part exerts more sufficient, while the lower part exerts less; (4) Under the common cement incorporation ratio, the change of pile aspect ratio and cement incorporation ratio has no significant effect on the bearing properties of piles when the pile length is more than 12 days.