考虑斜坡效应的基桩屈曲临界荷载分析

发布时间：2018-01-06 06:14

本文关键词：考虑斜坡效应的基桩屈曲临界荷载分析　出处：《岩土力学》2017年09期 　论文类型：期刊论文

【摘要】：以某实际工程桩为原型,根据相似理论设计并完成了斜坡基桩竖向承载室内模型试验,分析了不同坡度及桩长条件下斜坡基桩屈曲临界荷载,获得了基桩屈曲临界荷载理论计算公式及拟合公式。研究表明:竖向荷载作用下,基桩荷载-位移曲线均无明显拐点,且桩顶沉降、水平位移均随坡度或桩长的增加而增大,斜坡基桩的屈曲失稳破坏模型非常显著。斜坡基桩的屈曲临界荷载值由桩顶沉降和水平变形共同控制,斜坡坡度越大或基桩自由段越长,其屈曲临界荷载及竖向承载折减系数越小,斜坡效应越明显。对比分析表明,由理论公式和拟合公式计算得到的结果与模型试验结果均吻合较好,最大误差尚不足10%,验证了模型试验、计算理论及拟合公式的合理性,其成果可以为实际工程设计提供参考。
[Abstract]:Taking a practical engineering pile as the prototype, the indoor model test of the vertical bearing capacity of the slope foundation pile is designed and completed according to the similarity theory, and the critical buckling load of the slope foundation pile under different slope degrees and pile lengths is analyzed. The theoretical calculation formula and fitting formula of buckling critical load of foundation pile are obtained. The results show that under vertical load, there is no obvious inflection point in load-displacement curve of foundation pile, and the settlement of pile top is not obvious. The horizontal displacement increases with the increase of slope or pile length, and the buckling failure model of slope foundation pile is very obvious. The critical buckling load value of slope foundation pile is jointly controlled by pile top settlement and horizontal deformation. The larger the slope gradient or the longer the free section of foundation pile, the smaller the buckling critical load and vertical load reduction coefficient, the more obvious slope effect. The results obtained from the theoretical formula and the fitting formula are in good agreement with the results of the model test, and the maximum error is less than 10. The rationality of the model test, calculation theory and fitting formula is verified. The results can provide reference for practical engineering design.
【作者单位】：长沙理工大学土木与建筑学院;现代公路交通基础设施先进建养技术湖南省协同创新中心;中南大学资源与安全工程学院;
【基金】：国家自然科学基金资助项目(No.51408066,No.51478051,No.51378082) 湖南省教育厅优秀青年项目(No.16B013) 长沙理工大学土木工程优势特色重点学科创新性项目(No.16ZDXK02)~~
【分类号】：TU473.1
【正文快照】： This work was supported by the National Natural Science Foundation of China(51408066,51478051,51378082);Outstanding Young Projects of HunanProvincial Education Department(16B013)and Innovative Projects of Key Discipline in Civil Engineering of Changsha U

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