扩底楔形桩抗压承载力理论计算分析

发布时间：2018-06-04 03:12

本文选题：桩基 + 抗压承载力　；参考：《工程力学》2015年07期

【摘要】：扩底楔形桩是一种可以有效发挥桩侧摩阻力和桩端承载力,提高单位材料承载力的新型桩;然而针对其竖向抗压承载力理论机理及计算方法的研究相对较少。在小倾角范围内(5°),基于Randolph和Wroth荷载传递理论模型,建立考虑楔形角对荷载传递机理影响的扩底楔形桩桩侧摩阻力、桩端承载力计算方法;通过与数值计算模型和模型试验实测结果的对比分析,验证该文所建立的理论计算模型的准确性与可靠性;续而开展楔形角、扩大头直径以及桩体强度等因素对扩底楔形桩抗压承载力特性的影响分析。研究结果表明:该文所建立的扩底楔形桩理论计算方法可以准确、有效地计算其竖向抗压承载力;同等地质条件下,扩大头直径比楔形角对基桩竖向抗压承载力的影响更明显。
[Abstract]:The expanded bottom wedge pile is a new type of pile which can effectively play the pile side friction resistance and the bearing capacity of the pile end and improve the bearing capacity of the unit material. However, the research on the theoretical mechanism and calculation method of its vertical compression bearing capacity is relatively few. In the small angle range (5 degrees), based on the theoretical model of Randolph and Wroth load transfer, the wedge angle pair is established. The calculation method of side friction resistance and pile end bearing capacity of expanded bottom wedge pile is influenced by load transfer mechanism. Through comparison with numerical calculation model and model test results, the accuracy and reliability of the theoretical calculation model established in this paper are verified, and the factors such as wedge angle, enlargement head diameter and pile strength are carried out to the bottom wedge. The study results show that the theoretical calculation method of expanded bottom wedge pile established in this paper can accurately and effectively calculate the vertical compressive bearing capacity of the pile. Under the same geological conditions, the diameter of the enlarged head is more obvious than the wedge angle on the vertical compressive bearing capacity of the 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;大连理工大学海岸和近海工程国家重点实验室;
【基金】：国家自然科学基金项目(51278170,U1134207) 长江学者和创新团队发展计划项目(IRT1125)
【分类号】：TU473.11

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