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Abstract In order to prevent the filling wall along gob-side entry retaining being crushed when roof caves in deep well，the deep borehole blasting forced roof caving was taken to release the roof pressure and improve the supporting roadway gob-side entry retaining effect. The pressure relief mechanism of deep borehole blasting to forced roof caving was expounded by numerical simulation and theoretical analysis method. After dynamite blasting in hard rock，the surrounding rock of blasting boreholes produces a large number of fissures and the significant displacement by the explosion stress waves；and stresses were redistributed. So the additional load of filling body and the deformation of the surrounding rock were reduced which play the role of supporting roadway. Finally，in the working face 1252(1) of eastern area of Panyi coal mine，the deep borehole blasting was applied to forced roof caving field test；and the filling wall kept stable after mining. It provides a good reference for gob-side entry retaining under similar conditions.
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Received: 24 January 2013
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2013, Vol. 32 
