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首页> 外文期刊>International Journal of Rock Mechanics and Mining Sciences >Stability assessment of stope sequence scenarios in a diminishing ore pillar
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Stability assessment of stope sequence scenarios in a diminishing ore pillar

机译：矿柱递减中采场序列情景的稳定性评估

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Numerical modelling is a vital tool in the mining industry and is widely used for planning purposes as well as for examining phenomena on a mine-wide scale. In this paper, a comprehensive rock mechanics study is conducted for the planned mining sequence within an orebody that leads to the formation of a diminishing ore pillar at the Vale Garson Mine in Sudbury, Ontario. A mine-wide numerical model is first constructed in FLAC(3D) with input parameters derived from laboratory tests and borehole log data, and is then calibrated based on in-situ stress measurements. The planned mining sequence scenario, comprising mining fronts advancing from the eastern and western sides of the orebody, is examined based on a combined numerical-volumetric analysis. A qualitative assessment of "ore at risk" is first made based on two instability indicators; the brittle shear ratio (BSR) and major principal stress (sigma(1)). In addition, two other sequence scenarios are examined in which mining is accelerated in the east. A quantitative comparison of the results is then made for the three options using the same instability indicators. Based on the optimum sequence scenario, an assessment is conducted of effects emanating from variations in constitutive models and the presence of a shear zone. In the final phase, the BSI? and the presence of tensile conditions are used as instability indicators to study the volume of "ore at risk" in snipes adjacent to an opening during a mining stage. It is shown that the proposed methodology, while simple, can nevertheless be a powerful tool for the planning and validation of stope extraction sequence scenarios, and can be used in conjunction with multiple stability indicators. (C) 2015 Elsevier Ltd. All rights reserved,
机译：数值建模是采矿业中至关重要的工具，被广泛用于计划目的以及检查整个矿山范围内的现象。在本文中，针对矿体内的计划采矿顺序进行了全面的岩石力学研究，从而导致了安大略省萨德伯里的维尔加森矿山上逐渐减少的矿柱形成。首先在FLAC（3D）中使用从实验室测试和钻孔测井数据得出的输入参数构建一个全矿山的数值模型，然后根据现场应力测量结果进行校准。基于组合的数值-体积分析，检查了计划的开采顺序方案，包括从矿体的东侧和西侧推进的开采前沿。首先基于两个不稳定指标对“处于风险中的矿石”进行定性评估。脆性剪切比（BSR）和主要主应力（sigma（1））。此外，还研究了另外两个序列情景，其中东部开采加速。然后使用相同的不稳定性指标对三种选择的结果进行定量比较。基于最佳序列方案，对本构模型中的变化和剪切区的存在所产生的影响进行评估。在最后阶段，BSI？拉伸条件的存在和不稳定性指标被用作研究采矿阶段邻近孔口的剪口中“有危险的矿石”量的不稳定性指标。结果表明，所提出的方法虽然简单，但仍然可以作为规划和验证采场顺序场景的强大工具，并且可以与多个稳定性指标结合使用。 （C）2015 Elsevier Ltd.保留所有权利，

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