The Influence of Backfilling on Surface Deformation in the Eastern Subsidence Zone of Zhangfushan Mining Area
Non-pillars sublevel caving mining often leads to surface subsidence as well as cracking and deformation of surrounding areas,which affects the safety of surrounding buildings.Backfilling in subsidence zone is a common means to control the deformation of rock and soil around subsidence zone.Studying the inhibitory effect of backfilling in subsidence zone on surface deformation is helpful to the protection of buildings in key areas.Based on the deformation monitoring data and discrete element calculation results before and after backfilling in the eastern subsidence zone of Zhangfushan mining area of Jinshandian Iron Mine,the inhibitory effect of backfilling on surface deformation in different areas and the influence of backfilling amount on the surface deformation were analyzed.The results show that the backfilling in subsidence zone has a good inhibitory effect on the footwall,but it is affected by the backfilling amount and backfilling position.The footwall measuring points near the backfilling area are greatly inhibited.The hanging wall and end measuring points are less inhibited.When the backfilling amount reaches a certain level,backfilling can effectively inhibit soil deformation of the footwall and the hanging wall.At present,the backfilling amount in the eastern mining area is still at a low level.Increasing the backfilling amount can effectively inhibit the deformation of the hanging wall and the end.The research results can provide a reference for the management of subsidence zone.
Backfilling in subsidence zoneSurface deformationDeformation monitoringDiscrete element
NETL
NSTL
万方数据
