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| EPSCA3D ANALYSIS ON LOCAL GROOVING AND TOP-CAVING OF ABANDONED STOPE BY CONTROLLED BLASTING |
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Revised:October 20, 2003
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| DOI： |
| KeyWord:Abandoned stope disposal,Grooving top-caving,Controlled blasting,Finite element analysis,Seepage-mechanical coupling |
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| Abstract: |
| A new method,the technique for local top-caving of an abandoned stope by controlled blasting,is proposed to treat gently-inclined abandoned stope The mechanical principle of EPSCA3D is outlined and the mechanical character of the top-caving method is studied by EPSCA3D The comparison between the analytical results obtained by two-dimensional finite element analysis or EPSCA3D is actualized The study results show that when the united method is used,the roof stress will redistribute to keep safety production,and obvious surface subsidence and rock movement can be prevented The grooving location is basically same,and the trend of stress distribution and surface subsidence and rock movement is basically consistent for two-dimensional finite element analysis and EPSCA3D,but the results of EPSCA3D is further close to practice EPSCA3D shows that local grooving top-caving at a distance in strike and along incline can not only meliorate local ground pressure,but also decrease surface subsidence and rock movement For the seepage tension,the stress of lower levels and the tension stress at insulation wall increase,and the compression stress at insulation wall decreases before roof cutting And the rock movement of top-caving and non-dilapidated roof decreases faintly |
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