Strata Behavior Of Fully Mechanized Coal Face With Sublevel Caving By Light Supports In Faults Pillar

At present, most of the mines faced resource shortage which producted in the 1950s and 1960s on the domestic, many of the mines went into mining the corner coal pillar of residual mining stage. So the saftey problem of variety of island pillar was mined because of the dangerous of stress concentration and impulsion pressure. The conditions of mining methods and surrounding rock control technology were less studied. The structure character of surrounding rock of island pillar face and the technology of roadway driving the gate road on "down original site" as well as the strata behavior regularity of fault island pillar coal face were futher studied by way of theory analysis, numerical simulation, field exploring. And industrial field tests was implement successfully in the 2123 coal face of fault island pillar of Shi gejie colliery of Lu'an mining area.Firstly, the mechanical structure model of island pillar light top-coal coal face was established by way of analyses top-coal, immediate roof and main roof's mechanics property, and the spatial structure of surrounding rock masses of island from three to four island type in the process of mining, it was the theoretical foundation of further studying island pillar stope. The first time concept of roadway driving the gate road on "down original site" was proposed, and the reasonableness of layout was proved by way of theory analysis, the dimension of narrow pillar and roadway section and support parameters were further determined. Then the deformation failure and stress distribution of roadway and the distribution law of abutment pressure face were studied by the way of FLAC3D numerical simulation. Finally site implementation was tested in 2123 face, hydraulic support force and deformation of roadway and roof coal movement and anchor rod acting force were monitored comprehensive, the deformation law of surrounding rock and stress distribution and roadway deformation law of the island pillar face being mined were mastered relatively accurate. The research had guiding role of universal for the island pillar and the similar working condition can use for reference.