砂土中静压桩的桩端作用效应分析

发布时间：2018-01-15 14:17

本文关键词：砂土中静压桩的桩端作用效应分析　出处：《建筑科学》2016年11期 　论文类型：期刊论文

【摘要】：静压桩的沉桩阻力包括侧摩阻力和桩端阻力两大部分,由于桩侧阻力是在发生破坏了的土体中产生的,因此,分析桩端阻力更为重要。本文设计了30°、45°、60°和180°四种规格的桩端角,采用理论分析、颗粒流数值模拟和室内试验等方法研究了不同桩端角在砂土中的桩端作用效应。结果表明:不同桩端角的土体位移模式不同,桩端角越小,径向位移越大;桩端角越大,竖向位移越大;压桩力与砂土密实度相关,密砂中的压桩力随桩端角的增大而增大,而中密砂中各桩端角的压桩力差异性较小;不同桩端角的端阻力变化趋势相似但增幅不同,桩端角越大,端阻力增幅越大。
[Abstract]:The pile driving resistance of static pressure pile consists of two parts: side friction resistance and pile tip resistance. Because the pile side resistance is produced in the damaged soil mass, it is more important to analyze the pile tip resistance. In this paper, 30 掳is designed. The pile end angles of 45 掳60 掳and 180 掳are analyzed theoretically. Numerical simulation of particle flow and laboratory tests were carried out to study the pile-end effect of different end angles in sand. The results show that the soil displacement modes of different pile end angles are different, the smaller the pile end angle is, the greater the radial displacement is. The bigger the end angle of pile is, the greater the vertical displacement is. The pile-pressing force is related to the compactness of sand. The pile-pressing force in dense sand increases with the increase of pile end angle, but the difference of pile-pressing force in each pile end angle in middle dense sand is small. The variation trend of the end resistance of different pile ends is similar but the increase is different. The bigger the end angle is, the bigger the end resistance is.
【作者单位】：金陵科技学院建筑工程学院;南京工业大学土木与交通学院;
【基金】：国家自然科学基金项目(41472283) 金陵科技学院科研启动基金(jit-rcyj-201402)
【分类号】：TU473.1
【正文快照】： 210009)0引言在沉桩过程中,静压桩被匀速压入土体,桩的连续贯入是高应力水平下桩端周围土体的大应变塑性破坏与外围土体小应变弹性变形共同作用的结果。由于静力贯入过程很难精确分析,为此,学者们借助模型试验和有限元模拟进行沉桩机理的研究。丁佩民等[1]通过砂土中的大型沉

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