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在沉桩位置处设置预钻孔是工程中减小扩孔挤土效应的常用有效措施。针对邻近斜坡的沉桩挤土问题,假定土体为线弹性模型,采用镜像方法,将桩体的贯入模拟为一系列球形孔连续扩张过程,在已有文献的基础上进一步推导出邻近斜坡设有预钻孔时的沉桩挤土位移表达式。结果表明,受斜边非轴对称位移边界的影响,远离斜边自由边界一侧的挤土位移不如靠近斜边自由边界一侧明显;斜边自由倾斜边界越陡(即参数θ越小),斜坡挤土位移越大;随着边界角度θ的增大,斜边倾斜边界对沉桩挤土位移的影响逐渐减弱;预钻孔的孔深和孔径对减小邻近斜坡沉桩挤土位移有较大的影响,二者的结合能更有效地减少挤土位移的范围和深度。
The pre-drilling at the pile sinking location is a commonly used and effective measure to reduce the effect of expanding the compacted soil. Aiming at the problem of pile driving and squeezing in adjacent slopes, the soil is assumed to be a linear elastic model. The mirror method is used to simulate the penetration of pile body as a series of continuous expansion process of spherical holes. Based on the existing literature, The pre-drilling hole pile displacement displacement expression. The results show that the displacement of squeezed soil far away from the free edge of the bevel edge is not as obvious as that close to the free edge of the bevel edge due to the non-axisymmetric displacement boundary of the bevel edge. The steeper the slope of the free bevel edge (ie, the smaller the parameter θ) As the boundary angle θ increases, the influence of the bevel edge on the displacements of the pile sinking gradually diminishes. The hole depth and the hole diameter of the pre-drilled hole reduce the displacement of the subsidence pile A greater impact, the combination of the two can more effectively reduce the scope and depth of soil displacement.