静压管桩桩-土作用机制及其竖向承载力确定方法

发布时间：2018-03-01 17:16

本文关键词： 静压管桩数值模拟单桩承载力特征值　出处：《吉林大学学报(地球科学版)》2016年03期 　论文类型：期刊论文

【摘要】：为深入研究静压管桩桩土的作用机制及其竖向承载力的确定方法,以长春地区建筑工程使用的静压管桩为例,采用数值模拟方法和桩的载荷试验,分析了桩对桩周土的挤压作用以及桩端阻力变化规律。结果表明:桩被压入土体过程中,主要受到桩侧摩阻力和桩端阻力的作用,并造成桩周及桩端附近土体受到挤压而变形;随着桩入土深度的增加,桩顶荷载逐渐增大,而且桩径越大,相应深度的桩顶荷载就越大;同时,随着桩入土深度的增加,桩端阻力在单桩竖向承载力中的比例有规律地下降。根据桩端阻力在单桩承载力中所占比例与入土深度的关系,提出了静压管桩单桩承载力特征值的计算方法;对比建议公式和经验公式计算结果,其比值为0.57~1.26,两者结果接近。因此,文中所提出的单桩承载力特征值的确定方法是可行的。
[Abstract]:In order to deeply study the action mechanism of static pressure pipe pile and soil and the determination method of vertical bearing capacity, taking the static pressure pipe pile used in Changchun area as an example, the numerical simulation method and pile load test are adopted. The influence of pile on the soil around pile and the variation law of pile tip resistance are analyzed. The results show that the pile is mainly affected by the friction resistance of pile side and the resistance of pile end in the process of being pressed into soil, which results in the deformation of soil around the pile and the soil near the pile end. With the increase of the depth of the pile, the load on the top of the pile increases gradually, and the larger the diameter of the pile, the greater the load on the top of the pile at the corresponding depth, and at the same time, with the increase of the depth of the pile, The proportion of pile tip resistance in the vertical bearing capacity of single pile decreases regularly. According to the relationship between the proportion of pile tip resistance in single pile bearing capacity and the depth of buried soil, the calculation method of bearing capacity characteristic value of static pressure pipe pile is put forward. The ratio of the suggested formula and the empirical formula is 0.57 ~ 1.26, which is close to each other. Therefore, it is feasible to determine the eigenvalue of the bearing capacity of single pile in this paper.
【作者单位】：吉林大学建设工程学院;
【基金】：国家自然科学基金面上项目(40972171)~~
【分类号】：TU473.1

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