Research and practice on pressure relief effect of drilling in island working face
Aiming at the problem that the high stress field of the surrounding rock of the island working face can easily cause local rock burst disaster,No.N1206 heading face of Longhua Mine was taken as the engineering background,FLAC3D was used to establish a numerical model to simulate the stress distribution around the borehole with different borehole depths and different borehole spacings when the drilling pressure relief was used to prevent rock burst in the roadway affected by dynamic pressure.According to the simulation results,it was preliminarily determined that the large-diameter drilling pressure relief technology adopted a single-row eye arrangement.The drilling diameter was 113 mm,the drilling length was 10 m,and the borehole spacing was 0.7 m.Using the selected drilling parameters to carry out field drilling pressure relief and monitor the changes of surrounding rock stress with time on the left and right sides,it was found that the stress changes of surrounding rock at different depths were basically the same,and the stress value in the deep was greater than that in the shallow,and finally the surrounding rock stress tended to be stable.This study provided guidance for drilling pressure relief in dynamic pressure roadway under the condition of island working face.
isolated working facedrilling pressure reliefstress in the surrounding rockfield monitoringnumerical simulationmining pressure
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