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| Study on instability mechanism and support technology of an iron mine roadway in Yunnan |
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Received:March 05, 2024
Revised:April 07, 2024
Accepted:April 08, 2024
Published Online:March 24, 2025
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| DOI： |
| KeyWord:soft rock roadway; surrounding rock instability mechanism; plasticity district theory; road crowning lining |
| Author | Institution |
| AN Nan |
College of Land and Resources Engineering, Kunming University of Science and Technology |
| CHEN Junzhi |
College of Land and Resources Engineering, Kunming University of Science and Technology |
| REN Chunfang |
College of Land and Resources Engineering, Kunming University of Science and Technology |
| YANG Lixin |
College of Land and Resources Engineering, Kunming University of Science and Technology |
| WEI Hang |
College of Land and Resources Engineering, Kunming University of Science and Technology |
| CHEN Zhen |
College of Land and Resources Engineering, Kunming University of Science and Technology |
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| Abstract: |
| In order to solve the problem of serious damage to the two gangs of the roadway and deformation and damage to the surrounding rock such as bottom drum caused by the overall failure of the roadway support structure of a deep soft rock roadway in an iron ore mine in Yunnan, we analyze the reasons for the deformation and destabilization of the part of the roadway in the section of 1452 m through the on-site field surveys, ground pressure monitoring data, and XRD diffraction experiments, etc., and derive the radius of the plastic zone and the peripheral displacement through theoretical calculations, and theoretically analyze how the various factors affect the roadway. Theoretically analyze how each factor affects the destabilizing deformation of the roadway. Based on the orthogonal experiment method, 16 numerical models were established by using FLAC3D numerical simulation software to analyze the influence of anchor length, row spacing between anchors and spray layer thickness on the stability of the surrounding rock of the roadway based on the determination of the top and bottom plates of the roadway, the displacements of the two gangs, and the volume of the plastic zone. The joint support method of "resin anchor + anchor cable + pipe slit anchor + concrete spraying" is proposed, and the displacement monitoring of the roadway in the field test section is carried out through on-site industrial test, and the results show that the joint support method can effectively control the deformation of the peripheral rock of the roadway in the 1452 m segmental damage in the long term. |
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