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Gold Science and Technology ›› 2017, Vol. 25 ›› Issue (4): 81-86.doi: 10.11872/j.issn.1005-2518.2017.04.081

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Research on Pillaring Blasting Location Under Level Gob Group Conditions

BAI Zhaoyang1，WANG Guowei2，ZHANG Peng1，LIU Shuanping1   

  1. 1.Shaanxi Taibai Gold Mining Ltd.，Co.，Baoji    721607，Shaanxi，China；
    2.Institute of Safety Science and Engineering，South China University of Technology，Guangzhou   510640，Guangdong，China
  • Received:2017-02-16 Revised:2017-05-24 Online:2017-08-30 Published:2017-10-30

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Abstract:

In order to determine the best blasting location of pillar blasting under level goaf group conditions，combined with a large gold ore mining engineering in Shaanxi Province，this article adopts the numerical simulation software FLAC3D，and three pillar stoping schemes of“cone”，“waist” and “inverted cone”are simulated under the condition of level goaf group.The results show that displacement change of X direction of waiting pillar in goaf group is “waisted” program> “cone” program>“inverted cone” program，the influence span ratio of “waist”cut column method for 2 #，3 # and 4# cavity roof stress is 50.8%，68.5% and 28.5% respectively，are less than other schemes，to ensure stability of goaf group，it shows that“waist” cutting column method is the best blasting position of pillar stoping.The results also show that there is a plastic area in the process of blasting pillar，and tensile failure is the main factor，so proper reinforcement measures should be taken.

Key words:  pillar mining, cutting column method, blasting location, goaf group, FLAC3D software, numerical simulation, stress distribution

CLC Number: 

  • TD853

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