Experimental study on the synergistic anchoring effect of umbrella-shaped anchor and grouting body
The umbrella-shaped anchor can be used to quickly anchor the soil slope.After tension,the anchor can be anti-corrosively treated by grouting.At the same time,by studying the deformation and stress char-acteristics of the umbrella-shaped anchor-grouting body,the superposition of the two anchoring effects can be realized,which is helpful to the full play of the reinforcement effect of the anchoring system.At present,there are few related studies.In order to study the control method of umbrella-shaped anchor-grouting body cooperative anchoring,the pull-out tests of conventional grouting bolts,non-grouting umbrella-shaped an-chors and grouting umbrella-shaped anchors with different effective lengths were carried out in the soil slope.The results show that:the ultimate anchorage force of conventional grouted anchors under the shear damage condition of slurry-soil interface shows a nearly linear growth trend with the increase of the length of the grouted body;the ultimate anchorage force of deeply buried umbrella-shaped anchors under the con-dition of no grouting shows a rapid growth with the displacement firstly,and then tends to stabilize the characteristics of the change;under the condition of no grouting,the anchorage force of deep buried umbrel-la-shaped anchor increases slowly with the displacement,and then increases rapidly.Under the condition of grouting,by isolating the grouting body from the umbrella-shaped anchor,the stress mode of the grouting body is changed from tension to compression,and the plastic displacement generated during the growth of the anchoring force of the umbrella-shaped anchor is eliminated by cyclic tension,so as to realize the coordi-nation of the displacement of the grouting body and the umbrella-shaped anchor.The effectiveness of the synergistic control method of the superposition of the anchoring force of the umbrella-shaped anchor and the grouting body is verified by the field failure test.Through the synergistic control of umbrella-shaped anchor-grouting body,the economic benefits of umbrella-shaped anchor in the permanent reinforcement and repair project of slope can be further improved.
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