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| Numerical Simulation of Approach Rock Stability under Interlocking Vertical Mining of Adjacent Layered Approaches |
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Received:May 28, 2023
Revised:June 14, 2023
Accepted:June 27, 2023
Published Online:March 24, 2025
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| DOI： |
| KeyWord:Staggered vertical mining; Stability of surrounding rock; Cementitious filling method; No false top edge route |
| Author | Institution |
| Wang Kaijie |
Jinchuan Group Co., Ltd. Mining Area 3 |
| Liu Lining |
Jinchuan Group Co., Ltd. Mining Area 3 |
| He Junfeng |
Jinchuan Group Co., Ltd. Mining Area 3 |
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| Abstract: |
| Abstract: In the downward stratified infill mining method, for the problem of the stability of the approach surrounding rock under the staggered vertical mining of adjacent stratified approaches, a structural stress model of the approach surrounding rock is established, the influence characteristics of the infill dummy roof on the stability of the approach surrounding rock under different mining conditions are analyzed, and the mechanical state of the infill dummy roof under the three-phase approach mining is obtained; the numerical simulation of the lower stratified "three-phase The simulation analysis of the stress evolution characteristics of the approach surrounding rock under the "three stages" approach mining is carried out by using FLAC3D numerical simulation. It was obtained that: ① During backfilling of the first and second phase of the lower stratified approach, the horizontal stress of the two ore bodies side gang in the direction of advancement is hump-shaped distribution, and during the first phase of mining, the vertical displacement of the two gangs of the approach appears symmetrical positive and negative values; ②Dduring the backfilling of the third phase of the approach, the ore bodies of the unrecovered approach carry increasingly large overburden loads and the hazard factor gradually increases; ③ Affected by mining, the stability of the lower stratification edge approach is poor, especially when there is no false top edge approach back to mining, the rock stability is poor, the risk factor is high, and the support needs to be strengthened when back to mining. |
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