【摘要】 相比螺栓锚的竖向上拔、下压承载性能，其抗侧向荷载作用能力较弱。为充分发挥螺旋锚承载能力，提出将螺旋锚倾斜布置，形成倾斜单螺旋锚以减小其侧向荷载效应。对黄土状粉土中4根倾斜双锚盘单螺旋锚和1根倾斜单锚盘单螺旋锚进行原位试验，阐明该形式螺旋锚的竖向和水平耦合作用下的力学特征，明确现有设计方法对其侧向和轴向承载能力评估的适用性。结果表明，由于施工对螺旋锚上方土体的扰动，拉、压承载力比值通常低于1.0;螺旋锚在标准荷载作用下的最大变形不得超过25mm,在极限荷载作用下的最大变形不应大于50mm;无水黄土状粉土双两锚盘螺旋锚的扭矩系数为21.36～29.38,螺旋锚的施工扭矩整体上随钻入深度的增加而增大；在下压和水平荷载组合作用下，压力施加于由水平荷载产生的位移处引发附加弯矩，从而会进一步增大螺旋锚顶部的水平位移。考虑到螺旋锚的柔性特质及其抗侧移构造，推荐螺旋锚侧向承载力的计算采用P-Y曲线法。更多还原

【Abstract】 Compared to the bearing performance of helical anchors under vertical uplift and downward pressure, it exhibits relatively weaker resistance to lateral loads. To fully utilize bearing capacity of helical anchors, it is proposed to arrange the helical anchors at an inclination angle, forming inclined single-helix anchors to reduce the lateral load effects. In-situ tests were conducted on four inclined double-disk single-helix anchors and one inclined single-disk single-helix anchors in loess-like silt to elucidate their mechanical behaviour under combined vertical and horizontal loading and to assess the applicability of the current design method for evaluating their lateral and axial bearing capacities. The results indicate that the tension-compression bearing capacity ratio is typically less than 1.0 due to soil disturbance above the helix anchor induced during construction. The maximum deformation of the helical anchors under standard load should not exceed 25mm, and should not be greater than 50mm under ultimate load. The torque coefficient for double-disk helix anchors in unsaturated loess-like silt ranges from 21.36 to 29.38, and the construction torque generally increases with the embedment depth. Under combined action of compression load and lateral load, the compression force acting at the displacement induced lateral load generates an additional bending moment, which further increases the horizontal displacement at the anchor head. Considering the flexible nature of helical anchors and its specific configurations, the P-Y curve method is recommended for calculating the lateral bearing capacity of helix anchors.更多还原