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将挤密桩挤土过程视作沿桩长不变的一系列点位形成的球形孔扩张过程,把扩张过程中的桩周土体分为3个区域:流动破坏区、塑性变形区、弹性变形区。应用圆孔扩张理论,结合修正剑桥模型推导出了球孔扩张引起的土体应力、位移分布解析解。结果表明,挤密桩塑性区半径为桩半径的2.92倍,与试验结果基本吻合,验证了该分析方法的可行性。其结果可为挤密桩挤土效应的研究提供一种新的思路。
The compaction pile squeezing process is regarded as a spherical hole expansion process along a series of points along the length of the pile. The soil around the pile during the expansion process is divided into three areas: flow failure zone, plastic deformation zone, elastic Deformation zone. Applying the theory of circular hole expansion, combined with the modified Cambridge model, the analytic solution of stress and displacement of soil mass caused by the expansion of the hole diameter is deduced. The results show that the radius of the plastic zone of the pile is 2.92 times the radius of the pile, which is in good agreement with the experimental results, which verifies the feasibility of this method. The results can provide a new idea for the study of squeezing pile crowding effect.