Blasting Parameters of Gob Side Entry Retaining with Roof-cutting Pressure Relief
The 3218 air return roadway of Shuguang Coal Mine was affected by two times of dynamic pressure,and the surrounding rock damage was relatively serious,therefore the blasting roof-cutting pressure relief technology was proposed to reduce the energy released during the collapse of the basic roof,so as to achieve the purpose of protecting the roadway.Through numerical simulation,the cutting height was determined to be 9 m,the angle was 15°,and the strengthening support method of"anchor net cable+scaffolding"was proposed to further improve the strength of the surrounding rock.After construction,the maximum coal side displacement and roof subsidence of the roadway were 115 mm and 173 mm respectively,which proved that the use of blasting roof-cutting pressure relief technology and strengthening support can effectively ensure the safe use of the roadway.
roof-cutting pressure relief technologyroof cavingreinforced support
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