Deformation mechanism and control of roadways with broken roofs under bedding degradation influence
To solve the difficulty in supporting the roadways under broken roofs,we studied the deformation and failure mechanism for the roof under laminated deterioration in No.4 east belt extension roadway at Xinzhi Coal Mine,and accordingly put forward the supporting plan and employed it on site.This plan used the interface unit from FLAC3D to build a roof model of the laminated roadway,analyzed the deformation and damage characteristics of the broken roof under bedding influence,and compared the deformation law of roadway wall rocks with different support plans.For the laminated roof,the high prestressed bolt can fully improve the self-bearing capacity of the roof,and then reduce the bolt support density,which can also control the deformation of the roadway surrounding rocks and improve the development speed.According to the supporting plan,the monitoring data showed that the support measures can ensure the stability of the roadway surrounding rocks and help to improve the roadway tunneling speed,and provide a reference for similar laminar deterioration of the roadway supports under the broken roofs.
soft coal seam with soft roof and floorbolt-mesh supportinstability mechanismresin boltroadway support
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