Research on graded support technology for coal seam bifurcation area in Jintong Mine
In view of the production situation that the coal seam was stratified when the 51111 return air roadway was driven to 310m in Jintong Mine,and the coal seam became two layers of 5-1 coal and 5-1 coal after stratification,and the coal seam hardness was higher than the roof rock,the hierarchical support principle and key technology were proposed,and the anchor rod,short anchor cable and long anchor cable were respectively anchored to the stable 5-1 upper coal.Combined with FLAC3D numerical simulation software to simulate the prestressed field of the graded support,the support scheme was given.After the completion of roadway support,the deformation of roadway surrounding rock was monitored.The monitoring results showed that the deformation of surrounding rock showed a trend of'rapidly increasing first and then gradually stabilizing'.The convergence of roof and floor was less than 20 mm,and the convergence of two sides was less than 16 mm.The support scheme could effectively control the roof.
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