Treatment scheme of goaf group in Alhada Lead-zinc Mine

Aiming at the governance problem of the historical goaf group of Alhada Lead-zinc Mine,based on 3D laser scanning technology,the stability of goaf is analyzed qualitatively,the volume of each goaf is calculated quantitatively,and the filling sequence of goaf is given continuously. The mechanical and physical properties of the backfill were tested by laboratory tests. The results showed that the cement-sand ratio 1∶6, and the solid content 75% of backfill can be used for artificial sill pillars in winter. The cement sand ratio 1∶8,and the solid content 75% of backfill can be used as routine filling. Finally,a hydrostatic level system was used to monitor the surface of the empty area group. The monitoring results showed that the maximum accumulated settlement was about 8.5 cm,the surface settlement tended to be stable,and the rationality of the goaf treatment scheme is verified. The research results can provide a reference for the management of large-scale mined-out areas in similar metal mines.