Mine pressure law of self-forming roadways by roof cutting in semi-coal rock roadways of extremely thin coal seams
To solve the problems of mine pressure anomaly and difficult support at No.1105 working face of Hecaogou No.2 Coal Mine,based on the in-site situation,gob-side entry retaining was employed.We studied the mine pressure law of self-forming roadways by roof cutting on the basis numerical simulation and field measurement.The research results show that the roof vertical stress of retained roadways has a significant decrease after roof cutting.The roof stress varies in unimodal distribution during face mining.When the influence of the advance abutment stress of the working face is more than 60 m,and that of the lateral abutment stress is about 60 m.When the working face is recovered to 90 m,the roof vertical stress change reaches the maximum.According to the results of mine pressure monitoring,after roof-cutting blasting in thin seams,the stress for the constant anchor cable was significantly reduced,and the effect of roadway forming was favorable.The deformation of the constant anchor cables and wall rock of roadways showed a trend of"stable-fast-slow-stable".The maximum deformation of roof and floor is in the middle of the roadway.The roof recovery reaches stable after 110 m,the floor does after 80 m.
thin coal seamsemi-coal rock roadwayroof cutting pressure reliefabutment pressuremine pressure law
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