Technology of coal solidification and roof reinforcement for composite regenerated roof
To improve the safety and mining efficiency of the composite regenerated roof working face,we did experiments on coal body water injection solidification,roof grouting reinforcement,and split set roof reinforcement on No.16-17-31020 composite regenerated roof face at Pingmei No.12 Mine.We explored the law of mine pressure behavior on the composite regenerated roof working face,and evaluated the support effect of reinforcement measures.The research results indicate that with reinforcement on the roof,the integrity of the working face is significantly improved,and the risk of roof caving and support crushing is reduced.The average weighting interval is increased from 22.15 m to 29.92 m,and the roof pressure decreased from 25～31 MPa to 19～26 MPa.The amount of roof subsidence has been reduced by 50.4%,ensuring normal and safe mining on the working face,and bringing 16.7%increase in the mining rate.The coal solidification and roof strengthening measures have achieved good benefits,which can provide a reference for working faces under composite regenerated roofs.
regenerated roofcoal seam water injectioncoal solidificationroof groutingroof reinforcement
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