斜坡地形单桩竖向承载特性模型试验与数值模拟研究

为探明斜坡地形条件对桩基竖向承载特性的影响，结合模型试验和数值模拟方法，设计多组斜坡工况和水平对照工况，对单桩竖向承载特性进行研究，在相同桩长条件下对比分析平地、不同坡度的单侧斜坡和连续斜坡地形中桩基的竖向承载力、桩身轴力及桩侧摩阻力的变化规律和荷载传递机理。研究结果表明：在相同坡度条件下，单侧斜坡工况的单桩承载能力小于连续斜坡工况，且桩基竖向承载力随着坡度增大而降低，斜坡影响度呈非线性增长；斜坡地形主要影响桩侧阻力峰值大小，当桩侧阻力出现峰值时，对应的桩端阻力大小接近相等；斜坡地形中，桩身前后存在应力分布差异，坡前位置竖向应力和剪应力大于坡后位置，但剪应力差异仅存在于0~4倍桩径的浅层区域。

Model test and numerical simulation of vertical bearing capacity for single pile in slope

In order to study the influence of slope on the vertical bearing characteristics of pile foundation, combined with model test and numerical simulation method, multiple groups of slope conditions and horizontal ground condition were designed to study the vertical bearing characteristics of single pile. The vertical bearing capacity, axial force, side friction and load transfer mechanisms during load-bearing of pile was compared and analyzed in unilateral slope and continuous slope with the same pile length. The results show that:1.Under the same slope condition, the single-pile bearing capacity of unilateral slope is less than that of continuous slope, and the vertical ultimate bearing capacity of pile decreases with the increase of slope gradient, and the slope influence degree increases non-linearly; 2.The slope type mainly affects the peak value of the pile side resistance, and the pile tip resistance is close when the pile side resistance peaks. 3.In the slope, there is a difference in the stress distribution between the front and back of the pile body. The vertical stress and shear stress at the front of the pile body are larger than that at the position back of the pile body, but the difference in shear stress only exists in the area around 0~4 times the pile diameter.