Strata Behavior Law of Full-mechanized Caving Stopping Roadways in Close Coal Seams

Aiming at the problem of intense strata behaviors of lower stopping roadways in close coal seam, based on the geological and mining conditions of 10303 fully mechanized working face in a mine, the stress distribution and regions of plastic deformation of stopping roadways were calculated through FLAC^3D, and the field geological data of roadway deformation were surveyed in the same working panel. The result shows that the roadway deformation between roof and floor is 1 947 mm and the deformation between the ribs is 2 086 mm under the coupling of effect of pillar left in the upper coal seam and the stress distribution causing by the influence of mining moves, which leads to serious deformation and destruction of roadway. It is suggested that the roadway should be assigned in stress-relaxed area under the goaf, the width of pillar in section should be reduced, so that the roadway can be stable in strengthened support.