楔形桩与等直径桩承载特性对比模型试验研究

发布时间：2018-04-15 11:39

本文选题：桩基 + 极限承载力　；参考：《中南大学学报(自然科学版)》2017年06期

【摘要】：针对楔形桩的承载特性,开展砂土中竖向压荷载、水平向荷载以及地面堆载作用下等混凝土用量楔形桩和等直径桩承载特性对比模型试验,测得不同荷载等级下桩顶荷载-位移关系曲线以及桩侧摩阻力、桩端阻力、桩侧土压力、桩顶下拽位移和桩身下拽力等分布规律;探讨楔形桩与等直径桩在竖向抗压、水平向承载力以及负摩阻力特性的异同点,分析楔形角对砂土中基桩的承载特性的影响规律。研究结果表明:在本文试验条件下,砂土中楔形桩的单桩竖向抗压力和水平向极限承载力约分别为等混凝土用量等直径桩的0.75倍和1.26倍;楔形桩的桩顶下拽位移与等直径桩的下拽位移相比减小1/5~1/4。
[Abstract]:Aiming at the bearing characteristics of wedge pile, a comparative model test of bearing characteristics of equal concrete wedge pile and equal diameter pile under the action of vertical compression load, horizontal load and ground surcharge is carried out.The load-displacement relation curve of pile top under different load levels and the distribution of pile side friction resistance, pile tip resistance, pile side earth pressure, pile top drag displacement and pile bottom drag force are obtained, and the vertical compression resistance of wedge-shaped pile and equal diameter pile is discussed.The difference and difference of horizontal bearing capacity and negative friction resistance are analyzed, and the influence of wedge angle on bearing characteristics of pile in sand is analyzed.The results show that the vertical pressure resistance and horizontal ultimate bearing capacity of wedge pile in sand are about 0.75 times and 1.26 times as much as equal concrete content and equal diameter pile respectively.The pile top drag displacement of wedge pile is 1 / 5 / 4 / 4 less than that of equal diameter pile.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;河海大学土木与交通学院;江苏省有色金属华东地质勘查局;河南理工大学土木工程学院;
【基金】：国家自然科学基金资助项目(51278170)~~
【分类号】：TU473.1

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