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通过大型模型箱试验,采用盐城地区典型场地软土,分别以单桩和排桩为研究对象,研究了沉入单桩和排桩过程中的挤土效应,比较分析了沉入单桩和排桩时土体变形和孔隙水压力的变化规律。试验结果表明,径向距离愈大,挤土效应的影响愈小,沉入单桩时挤土效应对位移和孔隙水压力的影响范围在0.6倍和0.5倍桩长左右,沉入排桩时,挤土效应对位移和孔隙水压力的影响范围在1倍桩长左右和超过0.7倍桩长。试验结果对软土地区桩基工程的施工具有指导意义。
Through large-scale model box test, using the soft soil in the typical site of Yancheng area, taking the single piles and the row piles as the research objects, the squeezing effect of single piles and row piles was studied. Variation of soil deformation and pore water pressure during pile driving. The experimental results show that the larger the radial distance is, the smaller the effect of soil compaction is. The effect of squeezing effect on displacement and pore water pressure when sinking into a single pile is about 0.6 times and 0.5 times the length of pile, , The effect of soil squeezing on displacement and pore water pressure is about 1 times the pile length and more than 0.7 times the pile length. The test results are instructive for the construction of pile foundation in soft soil area.