本文总结了锚杆握裹力与位移关系的四种模型,对其中三种模型的握裹力分布、荷载位移关系和极限抗拨力等问题从理论上进行了分析.得出了极限抗拔力并不是随着锚固长度的增加而线性加大的结论,而是存在着临界锚固长度,当锚固长度超过临界锚固长度后,极限抗拔力的增加变得不明显,并给出了临界锚固长度的取法. This paper summarizes four models of the relationship between the anchor and the displacement of the anchor, and theoretically analyzes the distribution of the holding force, the load-displacement relationship and the ultimate anti-drag force of the three models, and obtains the ultimate pullout The force does not increase linearly with the increase of anchorage length, but exists the critical anchoring length. When the anchorage length exceeds the critical anchoring length, the increase of ultimate pull-out force becomes insignificant, and the critical anchorage The length of the method.