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通过桩孔孔壁土体稳定力学平衡方程及吹填土层流变特征,从力学、变形两方面阐述了沿海地区吹填土层内桩孔缩径原因,并结合工程实例进一步研究了吹填土层内桩孔缩径量随时间变化规律,结果表明:(1)桩孔缩径-时间关系与吹填土流变性质具有相似性,前期桩孔缩颈随时间呈线性增加,而后呈现明显的非线性增加趋势;(2)桩孔缩径量及变形速率随泥浆比重的增加而减小;(3)借助建立的拟合曲线方程可进行预测缩径量及变化区间。同时提出了相关减小桩孔缩径的措施及建议,为沿海吹填土地基中防治钻孔灌注桩桩孔缩径问题提供参考。
Through the stable mechanical equilibrium equation of the soil in the hole of the pile hole and the rheological characteristics of the dredger fill, the reason of the shrinkage of the pile hole in the dredger fill in the coastal region was explained in terms of mechanics and deformation, and the blow fill was further studied in combination with engineering examples. The variation of the amount of shrinkage of the pile hole with time in the soil layer shows that: (1) The shrinkage-time relationship of the pile hole is similar to the rheological behavior of the dredger fill. The shrinkage of the pile hole increases linearly with time, and then it is presented later. Obvious non-linear increasing trend; (2) The shrinkage and deformation rate of the pile hole decrease with the increase of the mud weight; (3) The shrinkage amount and the change interval can be forecasted by using the established fitting curve equation. At the same time, the relevant measures and suggestions for reducing the shrinkage of the boreholes are put forward, which can provide references for controlling the borehole shrinkage of bored cast-in-place piles in coastal blow-up landfills.