Abstract
To apply the compression-type anchor to deep roadways, this paper analyzes and summaries the bearing mechanism, shear stress distribution of the grout body and engineering application of the compression-type anchor. The analysis shows that the compression-type anchor has the advantages of reasonable grout body stress form, high loading capacity, good corrosion resistance and durability. The analysis also indicates that further study on the stress distribution of the compression-type anchor’s grout body and the design of a new compression-type anchor with high strength initial support, simple structure, and small diameter that is suitable for the surrounding rock in deep roadway engineering is necessary to apply compression-type anchor supporting technology to the deep roadway.
Highlights
At present, the pre-stressed anchor support is the major form applied in deep roadway anchor support
The analysis shows that the compression-type anchor has the advantages of reasonable grout body stress form, high loading capacity, good corrosion resistance and durability
The analysis indicates that further study on the stress distribution of the compression-type anchor’s grout body and the design of a new compression-type anchor with high strength initial support, simple structure, and small diameter that is suitable for the surrounding rock in deep roadway engineering is necessary to apply compression-type anchor supporting technology to the deep roadway
Summary
The pre-stressed anchor support is the major form applied in deep roadway anchor support. After the application of the pre-tightening force, the grout body, which is already bound to the anchor body, is in a most disadvantaged stress state: the brittle materials of the grout body are under tension, causing the supportive effect of the grouting anchor to further decrease and even become invalid. It is necessary to renovate the structure of the grouting anchor (tension-type anchor) to best maintain its active support effect, which will improve the integrity of the surrounding rocks and provide a sufficient pre-tightening force at the initial phase of support and enable the brittle materials of the anchor’s grout body to remain in an optimal compression state. The tension-type anchor’s grout body that is in a bound state with the anchor can apply and sustain a higher level of pre-tightening force As a result, it can significantly improve the reinforcement and support of the surrounding rocks. That which enables the grout body to effectively relay the pre-stressed load and enables the anchor to stay in an optimal working state is the key to realizing the active supporting effect of the anchor, which is a focal issue that has been continuously studied by researchers
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