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11、问:开缝式钢管摩擦锚杆锚固失败有哪些现象? 答:一种失败是园环受拉脱落,这在问题10中已经讨论。另一种是钢管端部被压碎,这是由于安装时冲击太久所致。过度的推压能由下述原因引起: a、钻孔直径太小,安装时推力太大。 b、钻孔深度不够,园环和垫板还没有接触到岩石表面,锚杆前端已接触到了钻孔的底部。
11, Q: What are the phenomena of failure of the anchor bolt of slotted pipe friction? A: One of the failures is that the ring ring is pulled off, which has been discussed in Question 10. The other is the end of the steel pipe is crushed, which is due to the impact of installation too long. Excessive pressure can be caused by the following reasons: a, drilling diameter is too small, the thrust is too large when installed. b, drilling depth is not enough, the ring and the pad have not yet reached the rock surface, the front end of the bolt has touched the bottom of the hole.