考虑到土层锚杆的拉拔破坏方式以锚杆体周围的土体的屈服或破坏为主 ,根据现场拉拔试验及数值计算成果 ,本文假定在极限状态下锚杆体破坏时在土体中形成一个锥体或纺锤形的破坏体 ,以极限分析理论为基础 ,确定了锚杆极限承载能力的计算方法。通过与常规的设计理论进行对比分析 ,本文确定的计算方法从另一方面描述了土层锚杆的破坏方式 ,而且这种破坏方式在工程实践中更常见 Considering that the failure mode of soil anchor bolt is mainly yielding or damaging the soil around the anchor rod body, according to the field pullout test and numerical calculation results, this paper assumes that under the condition of anchor bolt failure, In the formation of a cone or spindle-shaped destruction body, based on the ultimate analysis theory, to determine the ultimate bearing capacity of the bolt calculation method. By comparing with the conventional design theory, the calculation method determined in this paper describes the failure mode of soil anchor on the other hand, and the way of damage is more common in engineering practice