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由于土塞效应的存在,开口预制桩的挤土效应不同于闭口桩,对其进行模拟计算具有现实的工程意义。将桩体的贯入过程模拟为一系列球孔的扩张,其中球孔的数量依据体积相等原则计算得出。模拟计算方法采用源汇法和源源法解答得出半无限体中一系列球孔扩张产生的应力场和位移场。同时,计算模型纳入了沉桩过程中桩侧摩阻力和土塞效应对解答的影响,并通过现场试验对模型计算的精确度进行评价。
Due to the effect of soil plugging, the effect of precast piles is different from that of closed piles. It is of practical engineering significance to carry out simulation calculation. The penetration process of pile body is simulated as the expansion of a series of ball holes. The number of ball holes is calculated according to the principle of equal volume. The simulation method uses the source-sink method and the source method to solve the stress field and the displacement field generated by a series of ball-hole expansion in the semi-infinite body. At the same time, the calculation model includes the influence of pile-side friction and earth plug effect on the solution in pile-sinking process, and the accuracy of model calculation is evaluated through field test.