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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。
Taking a practical engineering pile as a prototype, this paper designs and completes the vertical bearing indoor model test of the slope pile based on the similarity theory, and analyzes the critical buckling load of the pile with different slope and pile length, and obtains the theoretical calculation of the buckling critical load of the pile. Formula and fitting formula. The results show that under the vertical load, there is no obvious inflection point in the load-displacement curves of the pile, and the settlement and the horizontal displacement of the pile top increase with the increase of the slope or pile length. The buckling failure model of the pile is very significant . The critical buckling load of sloped pile is jointly controlled by the settlement and horizontal deformation of pile top. The larger the slope or the longer the free section of pile, the smaller the buckling critical load and vertical bearing reduction coefficient, the more obvious the slope effect. The comparative analysis shows that the results calculated by the theoretical formula and the fitting formula are in good agreement with the model test results and the maximum error is less than 10%. The results of the model test, the calculation theory and the fitting formula are verified. The results can be The actual engineering design for reference.