Chiloane Nhleko Monique, Sengani Fhatuwani, Mulenga Francois
Department of Mining Engineering, University of South Africa, Florida Campus Private Bag X6, Johannesburg, 1710, South Africa.
Department of Geology and Mining, University of Limpopo, Private Bag X1106, Sovenga, 0727, South Africa.
Sci Rep. 2024 Jan 6;14(1):734. doi: 10.1038/s41598-024-51464-2.
The behaviour of a stratified backfilled stope in terms of strength development and stress distribution has not been well established in the field of rock engineering. Yet, the mining industries with massive ore bodies are looking into high production with a high standard of safety which is mainly governed by large excavation with backfill as a support system. It is difficult to fill these large excavations at one time. Therefore, a subsequent backfilling of the stope layer by layering is adopted, which results in a layered backfill structure. The purpose of this study was to explore the strength development, stress distribution and deformation across the stope supported by both layered and non-layered backfill. It has been observed that the backfill support system gain its strength with time, however, the layered backfill support system loses its strength when more layers are introduced, this is due to the shearing effect around the interfaces of the backfill layers. The impact of layering was validated by 3D numerical simulation. It is therefore concluded that non layered backfill support system are more suitable for stoping mining methods rather than layered support system.
在岩石工程领域，分层回填采场在强度发展和应力分布方面的特性尚未得到充分明确。然而，拥有块状矿体的采矿业正寻求高产量且具备高标准安全性的作业方式，这主要通过大规模开挖并以回填作为支撑系统来实现。一次性填充这些大型开挖区域很困难。因此，采用了采场分层后续回填的方式，从而形成了分层回填结构。本研究的目的是探究在分层回填和非分层回填支撑下采场的强度发展、应力分布及变形情况。据观察，回填支撑系统会随时间增强其强度，然而，引入更多分层时，分层回填支撑系统的强度会降低，这是由于回填层界面周围的剪切效应所致。分层的影响通过三维数值模拟得到了验证。因此得出结论，非分层回填支撑系统比分层支撑系统更适合空场采矿法。
