Characteristic Of The Coal-Concrete With Bolting Used In Driving Roadway Along Goaf

Coal mining without pillars can substantially improving coal recovery rate and ProlongMine Service Life. Driving along next goaf in coal pillar concrete anchor bar sandwich wall isdifficult along goaf in soft broken seam with high gas and implementation of pillarless miningof coal seam with large mining height and invented an advanced technology, use continuityform the wall of coal body, high-strength concrete anchor bolt on either side forming a bolt incoal for coal pillar concrete wall reinforced rib sandwich. The structure of coal body infulfilled continuity and high-strength concrete sealing, anchor the anchor properties form acomplex of reinforced, high strength three forming a tight seal along the wall.Under conditions of fully mechanized top-coal roadway driving along next goaf of coalpillar concrete wall anchor bar sandwich programme, according to the mechanicalenvironment of tunnel surrounding rock, pillar strength theory, theory of load and exported onthe basis of narrow coal pillar stability analysis of coal pillar width calculation formula,theoretically can be reached driving along next goaf with narrow coal pillar width. Drivingalong the bolt-reinforced wall surrounding rock pressure under certain conditions, andsandwich coal pillar width wall sprayed concrete thickness, anchor bar spacing parameter.This article discusses the anchor bar sandwich pillar concrete wall structures and mechanicalmechanisms, This article discusses the anchor bar sandwich pillar concrete wall structures andmechanical mechanism, using numerical simulation of rock and MIDAS/GTS soil analysis ofwall model simulation software, came to the wall there is an optimal combination ofrelationship between three variables.This article about Shanxi huangling4103face in new mine roadway driving along nextgoaf coal column of the wall anchor bar sandwich programme for simulation validation, bymonitoring results in the process of building new mines, structural strength and stability tomeet the face of safety requirements. And to build a new mining working face with realities made the anchor bar sandwich pillar concrete wall combined with bolt-mesh-anchor supportprogramme for subsequent design guidance.