Research on the Thickness of crown Pillar With Transition from Open Pit to Underground Mining
Received:December 11, 2012  Revised:March 24, 2013
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KeyWord:Transition from open pit to underground mining; Safe thickness of crown pillar;Numerical simulation; Finite element.
        
AuthorInstitution
Bi Jinzhong 广西北山矿业发展有限责任公司
wangping 东北大学
chencong 东北大学
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Abstract:
      In recent years, with the near-surface mineral resources dwindling,as well as the government putting more effort in raising the environmental protection requirements , many mines have been gradually transferred from open pit to underground mining.In the process of open pit transferring to underground mining, the safe thickness of the crown pillar has always been difficult to determined. If the crown pillar is too thick,it will cause the waste of resources. But if the crown pillar is too thin,it will threaten the safety in production.The article used a mine as engineering instance,according to the mine hydrogeological conditions and the physical and mechanical properties of the ore and rock,adopted synthetically structural mechanics of girder , thickness to span ratios method and K.B.Lu Peinie estimates to calculate,and compared the result with three dimensional numerical simulation analysis result,gained the relationship between the safe thickness of the crown pillar and the goaf span in the process of open pit transferring to underground mining. This has extremely vital significance for production of open pit mine and maintenance safety of operating personal and the equipments.
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