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以现有半无限土体中球孔扩张挤土位移的解答为基础,运用球体体积和圆柱体体积相等的原则,通过线弹性叠加法,模拟了静压沉桩贯入土体的动态过程,得到静压沉桩挤土位移的简化计算公式,并对土体弹性模量和泊松比等因素对挤土位移的影响进行了分析。结果表明:随着弹性模量的增加,挤土位移显著减小,且在较硬土体中压桩会对周围建筑和管线产生较为严重的危害;泊松比对挤土位移的影响较小,但总体来说,随着泊松比的不断变大,产生的挤土位移也越大。文中解答半无限体条件下的静压沉桩以及相关扩孔问题的设计和施工具有一定的指导意义和实用价值。
Based on the solution of the expansion of squeezed soil displacement in the existing semi-infinite soils, the dynamic process of penetration of static pressure pile into the soil was simulated by the linear elastic superposition method based on the principle that the volume of the sphere and the volume of the cylinder were equal. The simplified calculation formula for the displacement of static pressure pile is obtained, and the influence of elastic modulus and Poisson’s ratio on the displacement of soil is analyzed. The results show that with the increase of elastic modulus, the displacements of squeezed soil are significantly reduced, and the piles in harder soil will cause more serious damage to the surrounding buildings and pipelines. Poisson’s ratio has less influence on the displacements of squeezed soil , But overall, as the Poisson’s ratio increases, the displacement of squeezed soil increases. It is of guiding significance and practical value to solve the design and construction of static pressure-sinking pile under semi-infinite body condition and related reaming.