软土地区静钻根植桩抗压承载力计算方法研究 English Version
Research on calculation method for pre-bored grouted planted pile under compression in soft soil area
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摘要: 静钻根植桩是一种绿色、环保的植入桩，近年来在我国东部沿海软土地区得到了一些成功应用。然而目前不同类型植入桩规范中计算侧阻时桩身直径的选取标准不同；此外，植入桩的极限侧阻力、极限端阻力取值主要参照预制桩参数予以修正，针对修正系数取值的研究较少。本文基于静钻根植桩的荷载传递机理，结合6组静钻根植桩静载试验数据分析了计算侧阻时静钻根植桩桩身直径的取值标准，随后通过将静钻根植桩与钻孔灌注桩的承载力对比，推算出不同类型土体中静钻根植桩的侧阻修正系数；基于33组静钻根植桩静载试验数据，推算出了静钻根植桩的桩端扩大头的端阻修正系数取值。最后通过30组静钻根植桩的现场试验数据验证了所提出静钻根植桩抗压承载力计算公式和推荐修正系数的合理性。Abstract: The pre-bored grouted planted (PGP) pile is a type of green and environmentally friendly pre-bored pile, which has been successfully applied in soft soil areas in East China. However, the selection of pile diameter is different when calculating side resistance in different pre-bored pile specifications. Meanwhile, the standard value of peak skin friction and unit tip resistance are mainly referring to the parameters of PHC pile, and the research on correction coefficient is very limited. Based on the load transfer mechanism of PGP pile,, this paper analyzed the value standard of pile diameter when calculating the skin friction according to 6 groups of PGP pile test results. Then, by comparing the bearing capacity of PGP pile with bored pile, the corrected coefficient of skin friction of PGP pile was calculated in different soil layers. In addition, based on 33 groups of PGP pile test results, the tip bearing capacity correction coefficient of the enlarged base of PGP pile was also calculated. Finally,, the rationality of the proposed method and the correction coefficient for calculating the compressive capacity of PGP pile was verified through 30 groups of PGP pile field test data.
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