Influence of the distribution of external dump on composite slopes stability in Open-pit Coal Mine
董蒙蒙1
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作者信息
1. 新疆天池能源有限责任公司,新疆 昌吉 831100
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摘要
为探究新疆某露天煤矿外排土场的分布情况对采场-排土场复合边坡的影响程度,对复合边坡排土场-采场内部应力分布规律和滑坡理论模型进行分析,通过FLAC3D软件建立不同安全距离的复合边坡模型进行稳定性分析.结果表明:复合边坡滑坡机理为采场边坡在上部荷载高应力状态下径向卸荷区产生裂缝并持续发育至贯通;随着距离的增加,排土场"压力推移"效应逐渐减弱,距离为 300 m时外排土场对采场边坡几乎无影响;边坡稳定性系数为 1.44,满足长期安全要求;采场与外排土场间的安全距离为 300 m.
Abstract
In order to explore the influence degree of the distribution of the external dump of the open-pit coal mine in Xinjiang on the composite slope of the stope-dump,this article analyzes the stress distribution law and landslide theoretical model of the composite slope dump-stope,and establishes the composite slope model with different safety distances for stability analysis through FLAC3D software.The results show that the landslide mechanism of the composite slope is that cracks are generated in the radial unloading area of the stope slope under the high stress state of the upper load and continue to develop to penetration.With the increase of the distance,the"pressure transfer"effect of the dump is gradually weakened,and when the distance is 300 m,the external dump has almost no effect on the slope of the quarry.The slope stability is 1.44,which meets the long-term safety requirements.Therefore,we consider that the safe distance between the quarry and the external dump is 300 m.
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