Experimental study on anchorage mechanism and performance of rock umbrella anchor

The existing reinforcement technology of rock slope and cavern cannot provide large anchoring force and high time efficiency at the same time, which leads to being unable to achieve rapid and effective prevention and rescue in case of landslide, collapse and other dangerous situations. As a new type...

Full description

Saved in:
Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2021-10, Vol.861 (7), p.72116
Main Authors: Chen, Hang, Cheng, Yong-Hui, Hu, Sheng-Gang, Wang, Han-Wu, Xiong, Yong
Format: Article
Language:English
Subjects:
Anchor bolts
Anchorages
Bearing capacity
Composition
Compressive strength
Deformation
Failure analysis
Failure mechanisms
Failure modes
Landslides
Rock masses
Rocks
Tensioning
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The existing reinforcement technology of rock slope and cavern cannot provide large anchoring force and high time efficiency at the same time, which leads to being unable to achieve rapid and effective prevention and rescue in case of landslide, collapse and other dangerous situations. As a new type of mechanical anchoring bolt, rock umbrella anchor is based on the principle of compressing rock mass by tensioning the metal wedge and then producing friction force, finally using the compressive strength of rock mass and interface action to obtain large enough anchoring force. The new anchor can adapt to the deformation of the rock mass, realize rapid anchorage, and obtain larger anchoring force while continuously tensioning. In this paper, the structure composition of rock umbrella anchor is introduced at first. Secondly, based on the geometric characteristics of the structure composition, the anchoring mechanism is analysed and supposed. Thirdly, in-door pull-out model test is conducted to study the structural and anchorage performance of the rock umbrella anchor. In the tests, the deformation characteristics of the anchor are recorded and analysed in the whole pull-out process. Meanwhile, the anchorage failure modes, failure mechanism together with corresponding bearing capacity are obtained, and the influence factors are analysed. Finally, the supposed anchorage mechanism has been verified and the suggestion for application of this new type of anchor is proposed. The results of this paper provide experimental support for the design and engineering application of rock umbrella anchor.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/861/7/072116