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首页> 外文期刊>Rock Mechanics and Rock Engineering >Numerical Analysis of Block Caving-Induced Instability in Large Open Pit Slopes: A Finite Element/Discrete Element Approach
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Numerical Analysis of Block Caving-Induced Instability in Large Open Pit Slopes: A Finite Element/Discrete Element Approach

机译：大型露天采场边坡崩落诱发失稳的数值分析：有限元/离散元方法

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摘要

This paper addresses one of the most challenging problems in mining rock engineering—the interaction between block cave mining and a large overlying open pit. The finite element modeling/discrete element modeling (FEM/DEM) approach was utilized in the analysis of block caving-induced step-path failure development in a large open pit slope. The analysis indicated that there is a threshold percentage of critical intact rock bridges along a step-path failure plane that may ensure the stability of an open pit throughout caving operations. Transition from open pit to underground mining at Palabora mine presents an important example of a pit wall instability triggered by caving. Using combined FEM/DEM-DFN (discrete fracture network) modeling, it was possible to investigate the formation of a basal failure surface within an open pit slope as a direct result of cave mining. The modeling of Palabora highlighted the importance of rock mass tensile strength and its influence on caving-induced slope response. Keywords Block caving - Open pit–block cave mining interaction - Slope stability - Numerical modeling - FEM/DEM - DFN
机译：本文解决了采矿岩石工程中最具挑战性的问题之一，即块状洞穴开采与大面积的露天矿之间的相互作用。有限元建模/离散元建模（FEM / DEM）方法用于分析大露天矿边坡中崩落引起的阶梯路径破坏。分析表明，沿着阶梯路径破坏面存在临界完整岩石桥的阈值百分比，可以确保整个探矿作业中露天矿的稳定性。 Palabora矿山从露天开采过渡到地下开采的过程是崩落引发的井壁失稳的一个重要例子。使用FEM / DEM-DFN组合模型（离散裂缝网络），可以研究露天开采边坡内基底破坏面的形成，这是洞穴开采的直接结果。 Palabora的模型强调了岩体抗拉强度的重要性及其对崩落引起的边坡响应的影响。关键词崩落-露天矿-崩落采矿相互作用-边坡稳定性-数值模拟-FEM / DEM-DFN

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