LU Yugen,DUAN Xin,SUN Guoquan,et al. Research and practice on backfill treatment of surface dynamic collapse pit[J]. China Mining Magazine,2023,32(S2):49-54. DOI: 10.12075/j.issn.1004-4051.20230592
    Citation: LU Yugen,DUAN Xin,SUN Guoquan,et al. Research and practice on backfill treatment of surface dynamic collapse pit[J]. China Mining Magazine,2023,32(S2):49-54. DOI: 10.12075/j.issn.1004-4051.20230592

    Research and practice on backfill treatment of surface dynamic collapse pit

    • Subsidence pit backfilling treatment is of great significance for protecting the surface environment and ensuring the safety of underground mining. Since surface subsidence pit mining by caving method has the characteristics of dynamic development, it is of great safety risk for the implementation of backfill treatment project. Therefore, it is necessary to understand the dynamic development characteristics of subsidence pit and formulate reasonable backfill treatment process plan and safety guarantee measures on this basis. Taking the dynamic subsidence pit backfilling treatment project being implemented in Dahongshan Iron Mine as a successful case, this paper introduces the deformation characteristics of the dynamic subsidence pit, that is, each point of the subsidence pit is in a slow, steady and linear state of subsidence every month, and the maximum subsidence speed of the center of the subsidence pit is about 0.8-1.0 m/month, with an annual subsidence volume of about 910 000 m3. Introduces the backfill treatment scheme of the collapse pit, that is, the cover backfill treatment method of direct vehicle transport and bulldozer, which is piled up by steps from bottom to bottom. At present, the amount of waste rock has been backfilled about 7.293 million m³. And the relevant backfill management safety measures are emphatically expounded, which has important reference significance for similar subsidence pit management.
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