Practice of Grouting Reinforcement Technology for Small Coal Pillar Roadways along Goaf in Fully Mechanized Working Face
In order to improve the working environment of fully mechanized working face of 8230 and enhance the stability of roadway,8m small coal pillar in a mine face in Shanxi is reinforced by grouting to enhance the strength of coal pillar and improve the structure of surrounding rock.The grouting reinforcement scheme is designed as follows:the coal pillar grouting hole is arranged as"three flowers",the sealing material and the grouting material are inorganic double liquid grouting material,and the grouting pressure is not more than 5 MPa.The results of mine pressure observation show that the maximum deformation of coal pillar side in the section without grouting reinforcement is about 0.8 m,and the maximum deformation of coal pillar side after grouting reinforcement is less than 0.1 m.The integrity and stability of roadway surrounding rock can be guaranteed by grouting reinforcement of small coal pillar,and the safety of working face can be ensured.
Fully mechanized working faceSmall pillarGrouting reinforcementRoadway deformation
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