确定性块体理论在摩洛哥某露天矿边坡稳定性设计中的应用

IF 2.8 Q2 MINING & MINERAL PROCESSING Mining of Mineral Deposits Pub Date : 2023-06-30 DOI:10.33271/mining17.02.053
Y. Zerradi, M. Souissi, A. Larabi
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引用次数: 1

摘要

意图岩体中的不连续性是界定各种块体形状和大小的自然裂缝,这些块体可以从挖掘中坠落、滑动或倾倒,并在自重作用下坍塌,可能导致严重损坏。因此,在开始任何地表或地下挖掘项目之前,进行块体分析是至关重要的。本文提出了一种基于关键块体理论分析的方法,以选择摩洛哥某露天矿不同不连续岩体的合适边坡。方法。首先,确定每个台阶的主要不连续性,并将其投影到具有开挖平面最大倾角的立体网上。然后,根据块理论,利用可移除性定理可以识别可移除块。之后,进行极限平衡分析,以确定稳定块体所需的失效模式和摩擦角。当发现坡面的选定倾角不合适时,将其改变并减小一度,并重复相同的方法,直到获得最大安全坡面倾角。调查结果。基于关键块体理论分析的所提出方法的结果表明,所研究台阶的最大安全边坡角在63-73°范围内。与矿山中使用的58-78°之间的倾角相比,本研究的结果接近现场条件。独创性本研究通过消除引起不稳定块体(关键块体)的边坡角,并利用关键块体理论的立体投影方法,对裂隙岩体的最大安全边坡角进行了优化。实际意义。使用这种方法,在岩土数据非常有限的情况下,可以设计或评估土木或采矿工程项目中岩石边坡的稳定性。
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Application of the deterministic block theory to the slope stability design of an open-pit mine in Morocco
Purpose. Discontinuities in rock masses are natural fractures that delimit various block shapes and sizes, which can fall, slide or topple from the excavation and collapse under their own weight inducing probably severe damage. Thus, it is essential to carry out a block analysis before beginning any surface or underground excavation project. This paper proposes a methodology based on key block theory analysis to select the suitable slope of different discontinuous rock masses of an open-pit mine in Morocco. Methods. At first, the main discontinuities of each bench are determined and projected onto a stereonet with a maximum dip angle of the excavation plane. Then, it is possible to identify the removable blocks by using the theorem of removability according to block theory. After that, a limit equilibrium analysis is performed to determine the failure mode and the friction angle required to stabilize the blocks. When the selected dip angle of the slope plane is found to be unsuitable, it is changed and reduced by one degree, and the same approach is repeated until the maximum safe slope dip angle is obtained. Findings. The results of the proposed methodology based on key block theory analysis have shown that the maximum safe slope angles of the studied benches are in the range of 63-73°. When compared to the slope angles used in the mine, which are between 58-78°, the results of this study are close to in-situ conditions. Originality. In this research, the maximum safe slope angle of fractured rock masses was optimized by eliminating slope angles inducing unstable blocks (key blocks) and by using the stereographic projection method of key block theory. Practical implications. Using this methodology, stability of rock slopes in civil or mining-engineering projects can be designed or assessed when geotechnical data are very limited.
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来源期刊
Mining of Mineral Deposits
Mining of Mineral Deposits MINING & MINERAL PROCESSING-
CiteScore
5.20
自引率
15.80%
发文量
52
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