Analysis of the Stability of Pillarless Sublevel Caving in Large Space Mining
Received:May 06, 2015  Revised:May 21, 2015
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KeyWord:Pillarless;sublevel caving,Structure;parameter,Stress;of surrounding;rock,Displacement
     
AuthorInstitution
miaoshengjun School of Civil and Environmental Engineering University of Science and Technology Beijing
shilichao School of Civil and Environmental Engineering University of Science and Technology Beijing
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Abstract:
      The output of pillarless sublevel caving accounts for more than 85% of the total output in the mining process of underground iron mine. Small size stope structure parameters to some extent limits the efficiency in the exploitation of the mining methods, restricting the economic development of mine. FromStheSpoint of drawn-body spatialSarrangement optimization, goodness of fit for drawn-body and blasting pile body, high block structure and large space structure of two kinds of large structure parameter schemes in the application of pillarless sublevel caving mining is comparative analyzed. pillarless sublevel caving in large space can greatly reduce the extraction ratio,improve the stope ground pressure environment, control of ore loss and dilution, reduce the mining cost, and more conducive to improve the economic benefit are pointed out. Combining with mining practices, the FLAC3D is used for simulation analysis of the surrounding rock stress and displacement variation of pillarless sublevel caving in large space mining. The results show that the security stability meets the production requirements, verify that the pillarless sublevel caving in large space mining is feasible and economical.
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