Analysis and mechanism of ground movement, deformation and fracture induced by underground backfill mining

According to large quantity of data obtained from the ground GPS monitoring and underground investigation,the current status of the ground movement,deformation and fracture induced by underground backfill mining in Jinchuan Mine No.2 was given.Based on the detailed analysis of its development process,the main reason and mechanism of the ground movement,deformation and fracture lagged behind the backfill mining were studied,and the intense aftereffect was analyzed and the formation mechanism was also given.At the same time,the mechanism was well studied in the respect of space development process,indicating the relationship between the rock mass movement,deformation,fracture and the whole mine during the period of cut-and-fill.The obtained conclusion was consistent with that obtained in situ and might be used to guide the future production.