Based on the limit equilibrium theory and the hypothesis of planar sliding surface, a formula for calculating the Angle of shear failure was deduced considering cohesion and cut slope Angle.
基于极限平衡理论及平面滑裂面假定，在考虑土黏聚力及放坡角度的基础上，推导了平面滑裂面剪切破坏角的数学表达式。
Finally, the limit cohesion strength between the soil and the nail was obtained by in-situ test, and the results were also compared with those regulated by the technical specification.
最后通过试验土钉抗拔力反算土体与锚固体的极限粘结强度，并与规范推荐值进行了比较。
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