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《Chinese Journal of Underground Space and Engineering》 2010-02
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Stability Analysis on Stope Mining of Nanjing Yinmao Lead-zinc Mine

Wang Fanghan1,2,Liu Xin1,Xu Maolin1(1.College of Civil Engineering,Chongqing University,Chongqing 400045,China;2.Nanjing Yin Mao Lead-Zinc Mine Co Ltd,Nanjing 210033,China)  
The stability of the surrounding rock mass around stope is studied during the mining process by using FEM.The stress field,displacement field and plastic zone around stope is analyzed.In overall,the tension stress is mainly concentrated in the central part of the roof in the excavation face.With the excavation height increases,the tension stress became more and more and the area of tension stress distribution in stress field became wider and wider.The stress is concentrated highly in the pillar and this would have a strong influence on the overall stability of the stope and a part of the rock is seriously deformed.The phenomenon of roof caving would happen.As the backfill material is easy to yield,large tracts of plastic zone would appear to limit the deformation of pillar when contacted with the pillar.This would have a smaller influence on overall stability of the stope.
【CateGory Index】: TD311
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