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在沉入粘性土中不同挤土密度的桩的现场试验和模型试验的基础上,本文阐述了桩的挤土效应——桩侧摩阻力随着桩的挤土密度ρ的增大而增大。 本文把桩的沉放过程假定为圆柱形孔洞扩张的平面应变问题,计算出桩周土体的应力变化与模型试验实测到的应力变化相比较,得到了较满意的结果。 本文根据桩的挤土效应,提出了大直径开口管桩极限承载力的计算方法,可供工程设计人员参考。
Based on the field tests and model tests of piles with different soil densities embedded in cohesive soils, the squeezing effect of the piles is explained in this paper. The pile side friction resistance increases with the increase of the pile’s soil density ρ. . In this paper, the pile sinking process is assumed to be the plane strain problem of the cylindrical cavity expansion, and the calculated stress change of the soil around the pile is compared with the measured stress change in the model test, and satisfactory results are obtained. According to the squeezing effect of piles, this paper puts forward a calculation method for the ultimate bearing capacity of large-diameter open pipe piles, which can be used by engineering designers.