Practice of dense hole pre-splitting roof cutting and roadway retention technology in Ruineng Coal Mine
In the automatic roadway formation technology of cutting top and relieving pressure,pre-splitting and cutting top is an important part of pillar free mining technology.The top-cutting effect of pre-splitting is one of the decisive factors to de-termine the quality of roadway retention.Two-way blasting plays a good role in the pre-splitting seam cutting and blasting free pre-splitting has become the development trend of the future pre-splitting technology.Through field practice in the study mine,dense holes are used for pre-splitting and slit cutting.This paper analyzes the method of cutting the top of dense holes and believes that by constructing continuous holes of a certain diameter,angle,depth and density,the"compressive and ten-sile"characteristics of rock can be fully utilized to destroy the continuity of rock mass and further reduce the bending strength of rock mass,thus forming a sliding surface between roadway and goaf under the action of mine pressure,and finally forming a cutting line.The on-site practice shows that the pre-splitting cutting by dense hole has resulted in a quality retai-ning roadway.
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