Limestone Roof top Cutting Technology for Pressure Relief and Along the Optimization Design
According to the principle of roof cutting,pressure relief and gob retention,seam cutting is car-ried out along one side roof of mined-out area of mining roadway.After the stope,the roof is automatically cut off along the seam under the action of mine pressure,the coal wall that forms the roadway.This can not only maintain the integrity of the roadway but also separate the goaf from the roadway,then the automatically formed channel is used as the gob roadway of the next working face.But there are many difficulties in actual operation,in order to further optimize the way of retaining roadway along the goaf.After the study,it was de-cided to use the unit stent,Anchor wire rope,Coal gangue blocking I iron,single support combined support re-places original goaf retaining support.
cut the top pressure reliefcombined supportalong the empty left lane
NETL
NSTL
万方数据
