Research on the Failure Characteristics and Support Technology of Roadway Surrounding Rock Under the Condition of Different Coal Seam Dipping Angles
The transportation roadway in the 43lower06 working face of Qiwu Coal Industry has severe section convergence during production period,which affects safety production.Numerical simulation,on-site monitoring and other methods are used to study the failure characteristics of the roadway surrounding rock under different coal seam dipping angles,and their failure patterns are obtained.The results show that the vertical displacement amount of the roadway and the failure area of plastic zone increase positively with the increase of coal seam dipping angle;The plastic failure form of the roadway surrounding rock changes from a symmetric distribution state to an asymmetric distribution state with the increase of the coal seam dipping angle,and is mainly shear tensile failure.The reinforcement support is carried out using ways of anchor rods,anchor cables,and steel wire mesh.After on-site monitoring,the deformation of the roadway surrounding rock tends to stabilize around 40 days,with the subsidence amount of the roadway roof>convergence amount of the two sides>floor heave amount.The maximum displacement amounts are 53 mm,42 mm,and 40 mm,respectively,effectively controlling the deformation of the roadway surrounding rock and improving the quality of the roadway service.
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