Research on surrounding rock control technology for mining roadway under residual coal pillars in close distance coal seams
In response to the difficulty in controlling the surrounding rock of No.24202 return air roadway under the residual coal pillar in the close distance coal seam of Nanyangpo Mine during excavation,the vertical stress distribution and plastic zone expansion morphology after excavation were analyzed using FLAC3D numerical simulation software.The maximum depth of roof failure was 3.5 meters,and the two sides were 1.5 meters.Based on numerical simulation results and actual engineering conditions,a high-strength prestressed long and short anchor rod(cable)collaborative bearing support scheme was designed.Within an observation period of 50 days,the maximum movement of the two sides of the 24202 tailgate was controlled at 87 mm,and the maximum movement of the top and bottom plates was 92 mm.This effectively prevented disasters such as roadway roof caving and fragmentation,providing a certain idea for controlling the surrounding rock of the roadway under the same type of geological conditions.
close distance coal seamsresidual coal pillarnumerical simulationsurrounding rock control
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