对叶片镶嵌有微型土压力盒的自制全尺寸单叶片螺旋锚桩进行竖向拉拔试验,记录不同埋深下安装扭矩、桩身位移和叶片表面土压力随上拔荷载的变化情况。分析安装扭矩、极限抗拔承载力与埋深比三者之间的相互关系,并初步探究螺旋叶片表面的土压力分布规律。结果表明,在试验研究范围内,安装扭矩和极限承载力都随埋深比的增加呈线性增大,二者受共同因素影响,线性相关程度明显;在上拔过程中,叶片上表面土压力增量从根部到边缘呈逐渐增大趋势,下表面土压力增量则远小于上表面,且大部分区域压力基本保持不变,少数边缘区域增大;叶片上下表面土压力合力随上拔荷载的增加而增大;桩土之间摩阻力的发挥则呈抛物线形,当上拔位移达到土体破坏极限位移量时,摩阻力达到峰值,而后逐渐减小到零;可以通过叶片表面土压力的分布来计算螺旋锚桩的拉拔承载力。 Self-made full-size single-leaf helical anchor piles embedded with miniature earth pressure boxes were vertically pulled and recorded. The installation torque, pile displacement and soil pressure at different depths were recorded. Analysis of the installation torque, ultimate pull-out bearing capacity and depth of the relationship between the three, and preliminary study of spiral blade surface pressure distribution. The results show that both the installation torque and the ultimate bearing capacity increase linearly with the increase of burial depth ratio within the scope of the experimental study. Both of them are affected by the common factors and the linear correlation degree is obvious. During the process of pull-up, the earth pressure The increment of soil pressure increases from the root to the edge, and the increment of soil pressure on the lower surface is much smaller than that of the upper surface. The pressure in most of the areas remains unchanged and the marginal area increases. The friction resistance between pile and soil is parabolic. When the uplift displacement reaches the ultimate displacement of soil mass, the frictional resistance reaches the peak value and then decreases to zero gradually. It can be calculated by the soil pressure on the blade surface The distribution of helical anchor pile pull capacity calculation.