Quantifying the Influence of Variations in Rock Mass Properties on Stope Stability

IF 0.7 Q4 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Shahé Shnorhokian, H. Mitri
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引用次数: 0

Abstract

Abstract Variations in rock mass properties are well-established in rock mechanics and underground mining. The literature is replete with methods of assessing them and determining values that are used in design or numerical analysis. In this paper, a simplified 3D model is constructed for a tabular orebody in the Canadian Shield and instability is quantified using the ”brittle shear ratio” criterion to calculate the volume at risk. A 1-4-7 stope pillar sequence is implemented on four active levels, and three variations in the properties of the host formation are assessed. It is observed that the locations of ore at risk follow the formations of stope pillars and are then transferred to the sill pillars above and below. Instability in the footwall and the hanging wall is observed to be lesser in volume but remains persistent. With the allocation of weak properties to the host rock, at-risk volumes increase in the orebody, footwall, and hanging wall, and the reverse trend occurs with strong greenstone properties. It is concluded that the stress increase in the orebody is due to transfers from the weaker host rock, while that in the greenstone formation is due to the use of a lower compressive strength value.
量化岩体性质变化对采场稳定性的影响
岩体性质的变化在岩石力学和地下采矿中是公认的。文献中充满了评估它们和确定设计或数值分析中使用的值的方法。本文对加拿大盾构某型板状矿体建立了简化的三维模型,并采用“脆性剪切比”准则对失稳进行量化,计算危险体积。在4个活动层上实施了1-4-7采场矿柱序列,并对主地层性质的3种变化进行了评估。观察到,有危险的矿石位置遵循采场矿柱的形成,然后转移到上面和下面的基柱。观察到下盘和上盘的不稳定性体积较小,但仍持续存在。随着弱物性分配给主岩,矿体、下盘和上盘的危险体积增大,而强绿岩则相反。结果表明,矿体的应力增加是由较弱的寄主岩传递引起的,而绿岩组的应力增加是由于使用较低的抗压强度值引起的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Sustainable Mining
Journal of Sustainable Mining Earth and Planetary Sciences-Geology
CiteScore
1.50
自引率
10.00%
发文量
20
审稿时长
16 weeks
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