- Title
- Laboratory study on three-dimensional characteristics of gravity flow during longitudinal sublevel caving
- Creator
- Jia, Qingqing; Tao, Ganqiang; Liu, Yongjin; Wang, Shanyong
- Relation
- International Journal of Rock Mechanics and Mining Sciences Vol. 144, Issue August 2021, no. 104815
- Publisher Link
- http://dx.doi.org/10.1016/j.ijrmms.2021.104815
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2021
- Description
- Ore recovery and dilution in caving mines are strongly determined by the flow characteristics of broken rock, especially under inclined boundary conditions. A physical draw model was designed and used to investigate the gravity flow characterization of granular materials during longitudinal sublevel caving. The three-dimensional (3D) shapes of flow axis, isolated extraction zone (IEZ) and ore remnants under inclined walls were obtained using the discharged quantity method and 3Dmine software, which indicated that stope boundary conditions and orebody dip have an impact on the characteristics of gravity flow. The experimental results also showed that the gravity flow characteristics of 3D draw experiments under the inclined walls were significantly different from those of the two-dimensional (2D) draw experiments. The flow axis is a line segment and lies in the same plane and only the width of the IEZ can be displayed in 2D experiment. However, the flow axis is a space curve segment in 3D draw experiment. Since being cut off by the front and inclined upper walls simultaneously, the 3D IEZ is more complicated than the 2D IEZ and both the width and thickness of the draw body are displayed simultaneously in 3D state. The shape and location of ore remnants in 3D state are also different from that in 2D state. Therefore, the 3D IEZ is more consistent with the actual situation than 2D IEZ for sublevel caving stope. The 3D gravity flow presented may be used to determine the design of the extraction layout and improve ore recovery during longitudinal sublevel caving.
- Subject
- longitudinal sublevel caving; gravity flow; ore drawing; 3D draw body; 3D flow axis
- Identifier
- http://hdl.handle.net/1959.13/1464214
- Identifier
- uon:46932
- Identifier
- ISSN:1365-1609
- Language
- eng
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