|
| Stability analysis of goaf and horizontal pillars under large-scale mining conditions |
|
Received:September 11, 2025
Revised:November 30, 2025
Accepted:December 16, 2025
Published Online:April 30, 2026
|
| View Full Text View/Add Comment Download reader |
| DOI：10.3969/j.issn.1005-7854.2026.02.001 |
| KeyWord:mined-out area;horizontal pillar;upper stope wall;numerical simulation;stability analysis |
|
| 1.China Railway Resources Group Co. Ltd., Beijing 100039, China;2.BGRIMM Technology Group, Beijing 100160, China;3.National Centre for International Research on Green Metal Mining, Beijing 102628, China |
| Hits: 44 |
| Download times: 9 |
| Abstract: |
| The stability of goafs and horizontal pillars is a critical issue affecting the safety of underground mine production. To evaluate the stability of the high end walls of the upper open-pit goafs and the large-area horizontal pillars under large-scale mining conditions in a specific mine, this study established a three-dimensional numerical model based on the actual engineering conditions of the mine using the 3DMine-Rhino-FLAC3D coupled modeling technique. The model systematically simulated the entire process of stoping and backfilling at various levels, and stability analysis was conducted based on the distribution characteristics of the displacement and stress fields.The results indicate that the maximum displacements of the high end walls of the goafs in Orebody No. 1 and No. 9 are 23.130 mm and 30.193 mm, respectively (both less than 50 mm), with maximum principal stresses of 6.603 MPa and 10.378 MPa, respectively (both below the ultimate compressive strength of the rock mass). The maximum displacements of the horizontal pillars are 38.312 mm and 49.961 mm, respectively (both less than 50 mm), with maximum principal stresses of 10.547 MPa and 9.513 MPa, respectively (both below the ultimate strength limit of the rock mass). These findings demonstrate that, during the mining process, the high end walls of the upper goafs and the horizontal pillars remain in an overall stable state. However, the displacement of the horizontal pillar in Orebody No. 9 approaches the stability threshold, suggesting that real-time monitoring should be implemented during production, and support reinforcement should be carried out as necessary based on field conditions. To validate the reliability of the numerical simulation results, an on-site industrial test was conducted at the 3903P slope in the 930–885 m level of Orebody No. 9. Monitoring after the stoping process showed that the slope and the high end walls of the upper goafs remained stable, with no observed failures such as collapse or spalling. The settlement displacement of the horizontal pillar measured by multi-point displacement meters was 9.26 mm, which aligns well with the numerical simulation results, thereby verifying the accuracy of the established model. This study provides both theoretical and practical references for the safe production of the mine. |
| Close |
|
|
|