Study On Deformation And Failure Mechanism And Subsidence Visualization Of Overburden In Coal Seam Mining Based On GIS Technology

With the continuous mining of coal seam,the overburden rock above the goaf bends and breaks,and then collapses.Overburden movement spreads to the surface,resulting in surface deformation and subsidence,causing ground collapse,ground fissures and other geological hazards.By monitoring the deformation of overburden and analyzing the parameter characteristics of rock and soil changes,the deformation and fracture evolution characteristics of mining overburden can be effectively identified.It has important theoretical and practical value for ensuring the safety of mine production and reducing the impact of underground mining on the ecological environment of the mining area.In this paper,the deformation and failure characteristics of overlying strata under mining conditions are studied by using distributed optical fiber sensing technology and similar simulation experiments.Based on the sensing optical fibers laid in overlying strata,the relationship between the height of caving zone and fracture zone and the value of strain monitoring is analyzed,and a method for determining the height of water-conducting fracture zone based on optical fiber sensing technology is established.By introducing optical fiber monitoring data of mining overburden into GIS system,the contour maps of overburden strain in the process of coal seam mining are obtained.Combining with the mechanical characteristics of overburden,the deformation and failure characteristics of overburden are discussed,and the regional division of overburden is carried out.The prediction model of surface movement and deformation in Zhanghuaizhu working face of Zhangzhuang Coal Mine is established.Combined with MSPS mining subsidence prediction system,the rapid prediction of mining subsidence is completed.The digital elevation model of mining subsidence area is established by combining the prediction results with GIS,and the visual expression of mining subsidence area are realized.Based on the powerful spatial analysis function of GIS and the analytic hierarchy process(AHP),the risk assessment model of ground subsidence in Duji area is constructed.Through superposition analysis and grid calculation,the ground subsidence hazard zonation in Duji district is completed.