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Gold Science and Technology >

2019 , Vol. 27 >Issue 4: 513 - 521

DOI: https://doi.org/10.11872/j.issn.1005-2518.2019.04.513

Mining Technology and Mine Management

Numerical and Entropy Coupling Optimization of Mining Methods in Urban Underground Mines

  • Jianhua HU , 1 ,
  • Shuohan XU 1 ,
  • Zelin XU 2 ,
  • Lei HAN 2
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  • 1. School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China
  • 2. Chuzhou Tongxin Mining Co. , Ltd. ，Chuzhou 239011，Anhui，China

Received date: 2019-06-29

  Revised date: 2019-07-15

  Online published: 2019-08-19

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Highlights

On the premise of ensuring safe production，efficient exploitation has become an important mode of urban mining resources exploitation and utilization.The mining activities in urban underground mines will cause the stress field redistribution and displacement deformation of the upper and lower layers and surrounding rock masses.Langya Mountain copper mine in Anhui Province is a typical urban underground mine， dangerous accidents such as ground subsidence and structure collapse caused by mining must be avoided.Taking mining methods and techniques optimization as a goal，three mining method were put forwarded，which are upward horizontal cut and fill method，two-step open stope afterwards back-filling mining method and upward high stratification filling mining method.MIDAS GTS NX three-dimensional numerical calculation model of ore bodies based on the three mining methods was established.12 surface monitoring were decorated by using FLAC3D software to simulate the orebody in -365 m to 245 m middle section，Langya Mountain copper mine.Orebodies in different mining methods under the condition of stope mining and surface stability was researched，and the surface tilt，curvature and level displacement deformation parameters was calculated.On this basis，three schemes are evaluated and optimized by entropy weight according to the comprehensive mining technical and economic indexes.The results show that：（1）The distribution of the settlement area extends evenly and outward in a circle，and the settlement trend is consistent with the strike of ore body.According to the deformation data of 12 monitoring points of three mining schemes，the monitoring surface settlement displacement and horizontal displacement of each point are U-shaped distribution affected by the distribution rule of ore body，and the maximum deformation reaches 25 mm.（2）The displacement inclination，curvature and horizontal deformation calculated at monitoring points with dense surface buildings meet the safety requirements，and with the maximum values of 0.099 mm/m，0.17×10-3 ·m-1 and 0.0248 mm/m，respectively.（3）The calculated surface deformation indicators are scored by experts，and the scoring results of surface indicators and technical and economic indicators are normalized.The comprehensive evaluation index values of three different schemes are obtained in the model of entropy weight method，and the evaluation results show that plan 3 is the optimal scheme.The coupling of numerical simulation and entropy weight evaluation integrates the objective data and fuzzy evaluation，and makes scientific and reasonable comprehensive evaluation of different mining methods，thus putting forward new ideas and directions for the comprehensive evaluation of urban underground mines.

Cite this article

Jianhua HU , Shuohan XU , Zelin XU , Lei HAN . Numerical and Entropy Coupling Optimization of Mining Methods in Urban Underground Mines[J]. Gold Science and Technology, 2019 , 27(4) : 513 -521 . DOI: 10.11872/j.issn.1005-2518.2019.04.513

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