Design and Application Research of Weakening Scheme for Thick and Hard Roof of Yuenan Coal Industry
In order to achieve safe and efficient production of the 15#fully mechanized mining face under the thick and hard roof of Yuenan Coal Industry,taking the 2152G01 mining face as the background,laboratory testing,theoretical calculation,mining pressure monitoring and other methods were used to analyze and apply the roof weakening technology.The research showed that the basic roof of the working face belongs to level IVa,and the roof pressure will be very strong.The designed roof weakening cycle step distance is 30 meters,and deep hole blasting technology is used for pre splitting.After pre splitting,the working resistance of the hydraulic support is significantly reduced,the pressure strength of the working face is reduced,and the roof weakening effect is good.
hard rock layersdeep hole blastingpressure equivalen
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