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Gold Science and Technology >

2018 , Vol. 26 >Issue 4: 503 - 510

DOI: https://doi.org/10.11872/j.issn.1005-2518.2018.04.503

Regress Optimize Model of Limit Exposure Area to Stope in Wohushan Iron Mine

  • Jianhua HU , 1 ,
  • Qifan REN 1 ,
  • Zhonghua QI 2 ,
  • Jiwei ZHANG 2
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  • 1School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China
  • 2Shandong Hualian Mining Co.，Ltd.，Yiyuan 256119，Shandong，China

Received date: 2018-03-31

  Revised date: 2018-05-23

  Online published: 2018-10-17

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Highlights

In the mining of underground mines，the reasonable exposure area of stope is precondition to ensure the safety of mining operation.As the main structural parameter of underground mines，it is necessary for exposure area to be optimized.Taking Wohushan mine 27-31 line as the research object，a refined model of surface，orebody and stope model was built by using 3DMine-Midas-Flac3Dcoupling modeling technology was built by .10 calculation schemes of stope exposure area were designed under the length conditions of 30 m and 40 m for stope.Maximum tension stress of stope roof and maximum compressive stress of wall rock were obtained through numerical simulation.The regression optimization model of exposure area with tensile stress of roof and compressive stress of wall rock was established to determine the reasonable limit exposure area of stope under the protection of safety factor.The results showed that：（1）Maximum compressive stress mainly occurs in stope pillar and maximum tensile stress appears in stope roof by stope stability analysis；（2）The relationship between exposure accumulation and stress was obtained by establishing regression function curve of exposed area and maximum tensile stress and maximum compressive stress of stope.Under the same stope exposure area condition，the longer the stope，the smaller tensile stress.With same stress limit case，the longer the stope，the bigger exposure limit；（3）Taking the mine production safety coefficient of 1.3 as the base，according to occurrence condition of orebody and stope，the limit exposed area of Wohushan mine was determined to be 450 m2and 600 m2by the regression function curve using 30 m and 40 m length of stope. When rock mass mechanical parameters change，the limit exposure area and span value of stope was confirmed through adaptive decision of the regression function curve.

Cite this article

Jianhua HU , Qifan REN , Zhonghua QI , Jiwei ZHANG . Regress Optimize Model of Limit Exposure Area to Stope in Wohushan Iron Mine[J]. Gold Science and Technology, 2018 , 26(4) : 503 -510 . DOI: 10.11872/j.issn.1005-2518.2018.04.503

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