锚杆随着锚固长度的增加，极限抗拔力并不是线性增加的，而是增加得越来越不明显。
With the increase of the anchorage length of the anchor rod, the ultimate pull - out resistance of the anchor rod does not increase linearly, but is less and less obvious by gradual increase.
直接拧入式螺杆的极限抗拔力随着拆装次数的增多而下降，但是，当拆装次数为8-9时，极限抗拔力仍然可达到尼龙预埋螺母的水平。
It declines with the increase of times of direct assembling bolt knocked-down. But it can still reach that of nylon inbuilt nut after knocked-down 8 to 9 times.
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。
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。
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.
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