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首页> 外文期刊>Engineering Geology >Failure process and modes of rockfall induced by underground mining: A case study of Kaiyang Phosphorite Mine rockfalls
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Failure process and modes of rockfall induced by underground mining: A case study of Kaiyang Phosphorite Mine rockfalls

机译：地下开采诱发崩塌的破坏过程与模式-以开阳磷矿崩塌为例

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摘要

The analysis of the failure processes and mechanisms of rockfalls that are associated with underground mining activities is presented. The study area is located in Kaiyang Phosphorite Mine in Southwest China, where the geological condition is dominated by anti-dip slopes with layers inclined backward into the natural slope with decreasing strength in the rock mass from the upper (dolomite-rich) to the lower (shale-rich) strata. The analysis is based on field investigation and laboratory experimental study using a gravitational simulation device. The results support the proposed failure mechanism by demonstrating the process of failure from the deformation of the roof and floor in the stopes, to the development of surface cracks near the top of slopes, and eventually to the formation of rockfalls as the surface cracks propagate along pre-existing joints. The rockfalls are classified into one of three failure modes: crack-toppling, crack-sliding, and crack-slumping, in which the failures are governed by the corresponding characteristics of the rock mass structure. The study of the failure process and their spatial and temporal correlation with the underground workings reveals warning signs or indicators of impending slope instability. Improved understanding of the failure process and indicators can aid in early identification and timely warning of geohazards in phosphorite mines. (C) 2015 Elsevier B.V. All rights reserved.
机译：提出了与地下采矿活动相关的崩塌的破坏过程和机理的分析。研究区域位于中国西南部的开阳磷矿，其地质条件主要是反倾坡，其层向后倾斜到自然坡中，而岩体的强度从高（白云石）到低处逐渐减小。 （富含页岩）地层。该分析基于使用重力模拟设备的现场调查和实验室实验研究。结果表明了破坏过程，包括从采场顶板和底板的变形到斜坡顶部附近的表面裂缝的发展以及最终随着表面裂缝的传播形成落石的形成，从而支持了所提出的破坏机理。预先存在的关节。落石分为三种破坏模式之一：裂缝倾覆，裂缝滑动和裂缝塌陷，其中的破坏由岩体结构的相应特征决定。对破坏过程及其与地下工程的时空相关性的研究揭示了即将发生边坡失稳的警告信号或指示。更好地了解破坏过程和指标可以帮助及早发现和及时警告磷矿山的地质灾害。 （C）2015 Elsevier B.V.保留所有权利。

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