Research on Grouting Reinforcement Technology of Broken Roof in a Fully Mechanized Mining Face
When fully mechanized mining face meets geological structure,it is common for coal wall and roof to fall under the influence of tectonic stress and mining movement.During the period of a fully mechanized mining face passing through iggenetic rock and fault structure,roof breakage is prone to roof fall and sheet side accidents.By analyzing the causes of roof accidents and the mechanism of grouting reinforce-ment,combined with the actual working conditions of the site,Malisan chemical grouting reinforcement and filling scheme is adopted for the serious areas of the face roof fall and sheet side.Practice has proved that the physical and mechanical properties of crushed coal and rock mass and the integrity of coal body have been improved by grouting filling and reinforcement in the structural fracture zone,the maximum wall depth of the working face has been reduced from 1.8 m to 0.4 m,and the maximum roof falling height has been re-duced from 2.9 m to 0.6 m,which has improved the safety and efficiency of the working face.
fully mechanized mining working facetectonic beltstability of coal and rock massgrouting reinforcement
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