Surface subsidence pit exposure patterns and dynamic greening in Xiaowanggou Iron Mine
The caving mining method is widely used in underground iron ore mining,but the resulting surface sub-sidence damages vegetation,leading to significant carbon sink losses.Safely controlling the extent of surface subsidence and implementing dynamic greening are common challenges that need to be addressed for low-carbon mining.To tackle this issue,the exposure patterns of surface subsidence pits are statistically analyzed.Using the calculation formula for the distance between subsidence pits,the exposure locations of the pits along the advancing direction of the mining working face are predicted,identifying dangerous areas to avoid during truck backfill of waste rock.Two perpendicular directions around the subsidence pits are selected,where the lower edges are well-covered by loose materials,as back-fill sites for waste rock.Trucks transport waste rock from the open-pit stripping operation and safely backfill the subsi-dence pits in these two perpendicular directions.After the subsidence pits are backfilled to the predetermined height,dynamic greening with soil covering is performed in non-active mining areas,while surface cracks are filled with gravel and clay.After implementing these measures,the greening area of the subsidence zone in Xiaowanggou Iron Mine reached 87%,effectively maintaining the ecological environment of the mining area and significantly reducing carbon sink losses.
underground miningsurface subsidencesubsidence pit backfilldynamic greeningcarbon sink loss
NETL
NSTL
万方数据
