空场嗣后充填开采充填体与围岩作用机理研究
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摘要
为了分析空场嗣后充填采矿过程中充填体与围岩的作用机理,以某矿山M1矿体开采为工程背景,采用FLAC3D数值模拟软件分析了矿体开采后围岩的应力、应变及塑性分布以及采场被充填以后充填体与围岩之间的作用关系。结果表明:充填体可有效缓解或转移矿房底板及矿柱的应力集中状态,对矿房底板及矿柱的位移抑制作用较明显,能够改善采场围岩的塑性分布范围但改善的程度有限。
With the mining of M1section orebody in a mine taken as engineering background,stress,strain and plastic distribution of surrounding rock after the orebody is mined and the mechanism of interaction between surrounding rock and filling body after the stope is backfilled are analyzed by FLAC3Dnumerical simulation software.Results show that the filling body could effectively alleviate or transfer the stress concentration of stope floor and pillar and has an apparent inhibitory effect on the displacement of the stope floor and pillar.It could make limited improvement on the plasticity distribution of the stope surrounding rock.
With the mining of M1section orebody in a mine taken as engineering background,stress,strain and plastic distribution of surrounding rock after the orebody is mined and the mechanism of interaction between surrounding rock and filling body after the stope is backfilled are analyzed by FLAC3Dnumerical simulation software.Results show that the filling body could effectively alleviate or transfer the stress concentration of stope floor and pillar and has an apparent inhibitory effect on the displacement of the stope floor and pillar.It could make limited improvement on the plasticity distribution of the stope surrounding rock.
引文
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[2]Fall M,Benzaazoua M,Ouellet S.Effect of Tailings properties on Paste Backfill Performance.Proceedings of the 8th International Symposium in Mining with Backfill[C].Beijing:2004,193-201.
[3]Li P,Villaescusa E,Tyler D.Factors Influencing the Quality of Minefill for Underground Support.Proceedings of the 8th International Symposium in Mining with Backfill[C].Beijing:2004,248-252.
[4]V.M.Seryakov.Implementation of the Calculation Method for Stress State in Rock Mass with Backfill[J].Journal of Mining Science,2008,44(5):439-450.
[5]M.Fall,D.Adrien,et al.Saturated hydraulic conductivity of cemented paste backfill[J].Minerals Engineering,2009,22:1307-1317.
[6]Li Li,Michel Aubertin.Horizontal pressure on barricades for backfilled stopes.Part I:Fully drained conditions[J].Can.Geotech.J.2009,46:37-46.
[7]Hu K X,Kemeny J.Fracture mechanics analysis of the effect of backfill on the stability of cut and fill mine workings[J].International Journal of Rock Mechanics and Mining Sciences,1994,31(3):231-241.