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首页> 外文会议>International UDEC/3DEC Symposium on Numerical Modeling of Discrete Materials in Geotechnical Engineering, Civil Engineering, and Earth Sciences; 20040929-1001; Bochum(DE) >Numerical modeling with 3DEC and risk assessment for a geometrically complex and highly stressed sill pillar at Onaping Mine
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Numerical modeling with 3DEC and risk assessment for a geometrically complex and highly stressed sill pillar at Onaping Mine

机译：Onaping矿山中几何复杂且高应力的门槛支柱的3DEC数值建模和风险评估

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摘要

The 53-900 Block is the deepest of the highly stressed ore sill pillars that remain in between mined-out horizons at the Falconbridge Limited Onaping underground nickel mine located on the north side of the Sudbury Basin in Canada. This pillar holds considerable good grade reserves, and, as such, was planned to be recovered. In the Summer of 2002 the Ground Control Group at the mine and Itasca Consulting Canada undertook a study to design its recovery. As part of this work a detailed numerical modeling exercise was conducted in the form of a strain-softening 3DEC model. The combination of the complex geometry of the ore body, different mining methods implemented in the region over the years, and complex stress interactions between the different ore lenses and rock units resulted in a challenging modeling problem. This paper describes the model constructed for this project, shows how it was used to evaluate various mining sequences and illustrates the level of geometrical detail that can be achieved with 3DEC. It also discusses how the modeling results were used, along with other practical mining considerations, to derive a risk assessment system for the purpose of ranking the various sequencing options analyzed.
机译：53-900区块是位于加拿大萨德伯里盆地北侧的Falconbridge Limited Onaping地下镍矿的高应力矿石基柱中最深的部分，它们位于开采层之间。该支柱拥有相当多的优质品位储量，因此计划予以回收。 2002年夏季，该矿场的地面控制小组和加拿大Itasca Consulting进行了一项研究，以设计其采收率。作为这项工作的一部分，以应变软化3DEC模型的形式进行了详细的数值建模练习。矿体复杂的几何形状，多年来在该地区实施的不同采矿方法以及不同矿石透镜和岩石单元之间复杂的应力相互作用共同导致了一个具有挑战性的建模问题。本文描述了为该项目构建的模型，展示了如何将其用于评估各种采矿序列，并说明了3DEC可以实现的几何细节水平。它还讨论了如何使用建模结果以及其他实际的采矿考虑因素来得出风险评估系统，以对所分析的各种排序选项进行排名。

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