Ann Hill Coal Roadway Roof Structure Destroy Mechanism And Its Control

Shallow seam zone of weathering rock roadway roof caving soft easy, difficult to supportcurrent situation seriously affected roadway high efficient excavation.So it is necessary toresearch weathering zone of roadway roof failure mechanism of rock and surrounding rockcontrol. This article in view of this situation, through the numerical simulation, the simulationand field observation, study on the shallow seam zone of weathering rock roadway roofstructure, surrounding rock failure, instability and distortion rule and the influence factors.Roof damage including the initial deformation, separation, rupture and collapse process; crackextension is divided into initial expansion, two times, three times the extension extendingsplitting and fissure through four stages.Establishment of roadway roof surrounding rock mechanics model, and analysis rocksingle beam and rock multiple beam elastic mechanics, plastic mechanical state anddeformation. Draw the belt of weathering rock roadway roof damage from the lower layer tolayer damage occurs, the lower layer is the thinner and more easily separation; Two sides ofthe roadway and the roadway floor first deformation destruction, and to expand deep seam.Using ultrasonic observation, made clear the regularity of the surrounding rock fractureroughness, filling degree, open degree, direction, number, media type, structural planecompressive strength, shear strength and the measured velocity. The measured belt ofweathering bedrock roof of Ann Hill coal mine transportation roadway, plastic auxiliarytransport crossheading and working face open-off cut layer separation range, stratification andsurrounding rock broken situation. Put forward roadway roof surrounding rock supportoptimization schemes and countermeasures. Practice has proved, timbering optimizationscheme is feasible.