Geomechanics and Engineering

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Compression characteristics of filling gangue and simulation of mining with gangue backfilling: An experimental investigation

  • Wang, Changxiang (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Shen, Baotang (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Chen, Juntao (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Tong, Weixin (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Jiang, Zhe (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Liu, Yin (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Li, Yangyang (College of Mining and Safety Engineering, Shandong University of Science and Technology)
  • Received : 2019.11.16
  • Accepted : 2020.02.17
  • Published : 2020.03.25
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Abstract

Based on the movement characteristics of overlying strata with gangue backfilling, the compression test of gangue is designed. The deformation characterristics of gangue is obtained based on the different Talbot index. The deformation has a logarithmic growth trend, including sharp deformation stage, linear deformation stage, rheological stage, and the resistance to deformation changes in different stages. The more advantageous Talbot gradation index is obtained to control the surface subsidence. On the basis of similarity simulation test with gangue backfilling, the characteristics of roof failure and the evolution of the supporting force are analyzed. In the early stage of gangue backfilling, beam structure damage directly occurs at the roof, and the layer is separated from the overlying rock. As the working face advances, the crack arch of the basic roof is generated, and the separation layer is closed. Due to the supporting effect of filling gangue, the stress concentration in gangue backfilling stope is relatively mild. Based on the equivalent mining height model of gangue backfilling stope, the relationship between full ratio and mining height is obtained. It is necessary to ensure that the gradation of filling gangue meets the Talbot distribution of n=0.5, and the full ratio meets the protection grade requirements of surface buildings.

Keywords

Acknowledgement

Supported by : Shandong Provincial Natural Science Foundation, National Natural Science Foundation of China, Ministry of Science and Technology

The research described in this paper was financially supported from the funding of the Shandong Provincial Doctoral Program for Overseas Studies, Taishan Scholar Talent Team Support Plan for Advantaged & Unique Discipline Areas and Key research and development plan of Shandong Province (2018GSF117018; 2018GSF120003; 2019GSF111024), Shandong Provincial Natural Science Foundation (ZR2019BEE013) and National Natural Science Foundation of China(51804179; 51604167; 51974173), State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology(MDPC2016ZR01).

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