诱导冒落法回采挂帮矿引发的边坡失稳
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摘要
在露天转地下过渡期利用诱导冒落法回采挂帮矿时将引发边坡大规模失稳,这将对坑底的露天采矿、露天运输系统以及地表设施和建筑产生威胁.岩体结构对边坡失稳的发展有着关键的控制作用,通过非连续变形分析(DDA)方法研究了不同边坡岩体结构下,采用诱导冒落法回采挂帮矿时引发的边坡失稳过程.通过7组岩体结构各不相同的边坡模型,得到三种边坡失稳模式:滑移失稳、倾倒失稳、复合失稳,不同的边坡失稳模式导致不同的边坡破坏程度及破坏规模.最后以海南铁矿为背景,对诱导冒落法回采挂帮矿引发的边坡失稳过程进行了实例分析,为挂帮矿的开采设计和边坡失稳风险预测及预防提供技术支撑.
Induced caving is a new underground mining method,which contributes to the smooth connection of ore production during the transition from open pit to underground.However,large scale of slope failure can be triggered when mining hanging-wall ores by this method,which would pose a threat to the open-pit mining,the open-pit transportation system and the surface infrastructure.The discontinuous geological structure of the rock mass is a key factor for slope stability.In this paper,the discontinuous deformation analysis(DDA)was used to study the slope failure process caused by hanging-wall-ore mining excavated by the induced caving method in different rock mass structures.Three slope failure modes,namely,sliding,toppling and complex failures,were concluded based on seven models with different rock mass structures,leading to different failure modes.A case of slope failure was analyzed based on Hainan iron mine.This study provides some technical supports for mining design of induced caving,as well as risk prediction and prevention of slope failure.
Induced caving is a new underground mining method,which contributes to the smooth connection of ore production during the transition from open pit to underground.However,large scale of slope failure can be triggered when mining hanging-wall ores by this method,which would pose a threat to the open-pit mining,the open-pit transportation system and the surface infrastructure.The discontinuous geological structure of the rock mass is a key factor for slope stability.In this paper,the discontinuous deformation analysis(DDA)was used to study the slope failure process caused by hanging-wall-ore mining excavated by the induced caving method in different rock mass structures.Three slope failure modes,namely,sliding,toppling and complex failures,were concluded based on seven models with different rock mass structures,leading to different failure modes.A case of slope failure was analyzed based on Hainan iron mine.This study provides some technical supports for mining design of induced caving,as well as risk prediction and prevention of slope failure.
引文
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[8]Xu N X,Zhang J Y,Tian H,et al.Discrete element modeling of strata and surface movement induced by mining under openpit final slope[J].International Journal of Rock Mechanics and Mining Science,2016,88:61-76.
[9]Goodman R E,Kieffer D S.Behavior of rock in slopes[J].Journal of Geotechnical and Geoenvironmental Engineering,2000,126(8):675-684.
[10]李海英,任凤玉,严国富,等.露天转地下过渡期岩移危害控制方法[J].东北大学学报(自然科学版),2015,36(3):419-422.(Li Hai-ying,Ren Feng-yu,Yan Guo-fu,et al.Control method of rock caving hazard during transition from open pit to underground mining[J].Journal of Northeastern University(Natural Science),2015,36(3):419-422.)
[2]Atzeni C,Barla M,Pieraccini M,et al.Early warning monitoring of natural and engineered slopes with ground-based synthetic-aperture radar[J].Rock Mechanics and Rock Engineering,2015,48(1):235-246.
[3]Fotopoulou S,Pitilakis K.Predictive relationships for seismically induced slope displacements using numerical analysis results[J].Bulletin of Earthquake Engineering,2015,13(11):3207-3238.
[4]Adhikary D P,Dyskin A V,Jewell R J,et al.A study of the mechanism of flexural toppling failure of rock slopes[J].Rock Mechanics and Rock Engineering,1997,30(2):75-93.
[5]Cundall P.Recent advances in numerical modelling for largescale mining projects[R].Minneapolis:Itasca Consulting Group,Inc,2008.(277)
[6]Vyazmensky A,Stead D,Elmo D,et al.Numerical analysis of block caving-induced instability in large open-pit slopes:a finite element/discrete element approach[J].Rock Mechanics and Rock Engineering,2010,43(1):21-39.
[7]Woo K S,Eberhardt E,Rabus B,et al.Integration of field characterisation,mine production and InSAR monitoring data to constrain and calibrate 3-D numerical modelling of block caving-induced subsidence[J].International Journal of Rock Mechanics and Mining Sciences,2012,53:166-178.
[8]Xu N X,Zhang J Y,Tian H,et al.Discrete element modeling of strata and surface movement induced by mining under openpit final slope[J].International Journal of Rock Mechanics and Mining Science,2016,88:61-76.
[9]Goodman R E,Kieffer D S.Behavior of rock in slopes[J].Journal of Geotechnical and Geoenvironmental Engineering,2000,126(8):675-684.
[10]李海英,任凤玉,严国富,等.露天转地下过渡期岩移危害控制方法[J].东北大学学报(自然科学版),2015,36(3):419-422.(Li Hai-ying,Ren Feng-yu,Yan Guo-fu,et al.Control method of rock caving hazard during transition from open pit to underground mining[J].Journal of Northeastern University(Natural Science),2015,36(3):419-422.)
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