Research on the characteristics and mechanism of bottom expansion backfilling anchoring reinforcement in fractured surrounding rock roadway
Abstract The weak anchoring force and poor stability of the anchoring system in fractured surrounding rock roadway often lead to anchor rod slip failure, which seriously affects the safe and efficient mining of the mine. Therefore, this article intends to use theoretical analysis, indoor experiments...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-07-01
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| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-11417-9 |
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| Summary: | Abstract The weak anchoring force and poor stability of the anchoring system in fractured surrounding rock roadway often lead to anchor rod slip failure, which seriously affects the safe and efficient mining of the mine. Therefore, this article intends to use theoretical analysis, indoor experiments, numerical simulations, and industrial experiments to study the migration law of wedge-shaped borehole grout and the reinforcement characteristics of surrounding rock grouting, the axial anchoring force reinforcement characteristics of the expanded bottom backfill anchoring technology and self-expanding enlarged head anchor rods, and the anchoring reinforcement mechanism of expanded bottom backfill anchoring technology and self-expanding enlarged head anchor rods. Firstly, The dimensions of the numerical simulation model are 2000 mm × 2000 mm. The study of the migration law of wedge-shaped borehole grout and the reinforcement characteristics of surrounding rock grouting reveals the diffusion law of wedge-shaped borehole grout and the mechanical changes in surrounding rock modification and replacement; Secondly, indoor anchor rod pull-out tests were conducted on three different anchoring forms, and the anchoring force changes of the three anchoring tests were compared and analyzed, as well as the interaction results between the filling body and the surrounding rock interface in the comparison group. The reinforcement characteristics of the expanded bottom filling anchoring using self expanding head anchor rods were obtained; Simultaneously, establish a mechanical model for expanding bottom backfill anchorage through theoretical analysis; Finally, on-site industrial inspections were carried out in Roadway 050001-07, the roadway is a 2.6 m × 2.6 m three arch roadway. It was found that after using self expanding head anchor rods for bottom filling and anchoring support, the roadway surrounding rock deformation shifted from axial-dominant to transverse-dominant. In comparison with the original support scheme, the maximum roof-to-floor displacement of the roadway decreased by 94%, and the maximum displacement of the two sides decreased by 88%. The stable time of the roadway was reduced from the original 300 days to 150 days, with the stable time advanced by 150 days. Further evidence shows that this anchoring support technology can achieve a significant increase in anchoring force with a small increase in engineering investment, effectively ensuring the stability of the roadway. |
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| ISSN: | 2045-2322 |