Research and Application of Support Parameters for Transportation Roadway of the 4305 Working Face
In order to solve the problems of large deformation amount of surrounding rock and difficult to control and others during the transportation roadway working period of the 4305 working face in Jinqiao Coal Mine,theoretical calculations are used to obtain reasonable support parameters for the roadway.A FLAC3D numerical calculation model is established to verify the rationality of the support parameters.The anchor rods length of the roadway roof and two sides is 2400 mm,with a row spacing of 1000 mm,and the length of the roof anchor cable is 6300 mm,with a row spacing of 2000 mm.The failure depth of the plastic failure zone of the roadway roof surrounding rock is 1.94 m,and the failure depth of the plastic failure zone of the two sides surrounding rock is 1.24 m.The length of anchor rod support effectively controls the surrounding rock deformation.After on-site industrial tests,the maximum force bearing values of the anchor rod and anchor cable of the roadway roof reaches 35 kN and 60 kN respectively,both of which does not exceed the stress yield values of the anchor rod and anchor cable.The maximum displacement amount of the roof and floor of the roadway is 50 mm,and the displacement amount of the two sides is 115 mm;The displacement amount of the roadway surrounding rock changes relatively small,effectively controlling the deformation of the roadway surrounding rock.
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