Stability control technology of dynamic pressure roadway in close coal seam
In view of the current situation of the underlying 3403 working face needing excavation during the mining of the o-verlying 3205 working face in the 1-3 mining area of a mine in Shanxi,the superposition influential law of the mining stress of the overlying working face and the excavation stress of the underlying working face was analyzed by numerical simulation,and the influential range was determined to be 70 m before the horizontal layer encountering to 20 m after encountering.The support parameters for the relevant anchor-net-cable were designed in a zoning way.The changes of subsidence and the dis-placement of the two sides are controlled within 10 mm,and the deformation is effectively controlled,which verifies that the design of the support parameters is reasonable for ensuring the safe and efficient production of the mine.
close coal seamroadway excavationmining stresssurrounding rock controlroadway deformation
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