砂土中倾斜螺旋桩水平承载性能有限元分析

受限于锚-土间相互作用的复杂性，当前倾斜螺旋桩水平承载特性的相关研究仍不能满足相关工程要求。基于螺旋桩竖直单桩水平承载试验，并通过非线性有限元软件ABAQUS研究了倾斜单桩在水平荷载作用下的承载性能，具体分析了不同倾斜角度对承载特性的影响，主要研究结果如下：（1）在水平荷载作用下，倾斜角度不超过45°，螺旋桩由水平极限位移控制破坏；（2）随着倾斜角度的增加，螺旋桩的水平承载力逐渐提高，对于相同倾角的螺旋桩，正倾的水平承载力始终大于负倾，叶片分担的荷载与水平极限承载力的比值不断增大（对于正倾螺旋桩，比值从2.4%增大到15.6%）；（3）在加载的全过程中，土体的塑性变形区域主要集中在顶端桩侧小范围内，叶片处土体未发生塑性变形。

Horizontal Bearing Performance of Inclined Helical Pile in Sandy Soil Using Finite-Element Analysis

On account of the complexity of the interaction between anchor and soil, the current researches on the horizontal bearing capacity of inclined spiral piles are still unable to meet the relevant engineering requirements. Based on the horizontal bearing test of spiral vertical single pile, the bearing performance of tilted single pile under horizontal load was studied by nonlinear finite element software ABAQUS, and the influence of different inclined angles on the bearing performance was analyzed in detail. The main research results are as follows:(1) When the tilt angle does not exceed 45°, the screw pile is controlled by the horizontal limit displacement under the action of horizontal load. (2) With the increase of the tilt angle, the horizontal bearing capacity of the spiral pile gradually increases. For the helical pile with the same dip angle, the horizontal bearing capacity of positive dip is always greater than that of negative dip, and the ratio of the load shared by the blades to the horizontal ultimate bearing capacity keeps increasing (for the helical pile with positive dip angle, the ratio increases from 2.4% to 15.6%). (3) In the whole process of loading, the plastic deformation area of soil mass is mainly concentrated in a small range on the side of the top pile, and the soil mass at the blade has no plastic deformation.