Deformation and failure analysis and control of deep roadway with intercalated coal seam in roof
Aiming at the problem of large deformation and failure of soft rock roadway in deep coal seam roof,taking the belt transport roadway in No.Wu2 mining area of No.3 horizontal plane in No.6 Mine of Pingdingshan Coal Group as the engineering background,the failure mechanism and control countermeasures of surrounding rock in intercalated coal seam roadway were studied.Firstly,the combined arch mechanical model of the original scheme of belt was constructed,and the stability discriminant of the straight wall semi-circular arch roadway was derived.Secondly,the joint repair technology of "anchor cable-beam-grouting-composite mortar anchor cable" was proposed,that was,the roadway was expanded along the roof of No.Wu8 coal seam,and the basic support of the roadway was completed by anchor cable and ladder beam.The deep and shallow hole grouting of surrounding rock was used for reinforcement support,and the composite mortar anchor cables were arranged at the key parts of the roof and the two sides to strengthen the roadway support.The distribution characteristics of stress and displacement field before and after roadway repair were analyzed by numerical simulation.Finally,the industrial test of the roadway was carried out.The monitoring results of mine pressure show that the maximum convergence of the two sides and the roof and floor are 93 mm and 112 mm respectively,and the deformation rate of the surrounding rock of the roadway is less than 1 mm/d in the later stage.The deformation has been effectively controlled and the repairing effect is good.
roofintercalated coal seamdeformation and failure of surrounding rockcontrolling measuresoft rock roadwaycomposite arch
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