Study on Sliding Mechanism and Dynamic Support Method of Roadway with Weak Interlayer
Aiming at the serious problem of roadway deformation in the mining process of 45203 mud-bearing interlayer roadway in Sandaogou Coal Mine,the mechanism of roadway deformation and dynamic support technology under the disturbance of mining face are systematically studied by the method of field monitoring,theoretical analysis and numerical simulation.The results show that the deformation of mud-stone interlayer roadway is mainly two-wall deformation,the maximum displacement of two walls of roadway is 357 mm,the maximum failure depth is 1.89 m,and the roadway should be strengthened.Due to the inter-action between the horizontal shear stress of coal and the friction generated by the contact surface of mud-stone interlayer,the roadway of mudstone interlayer shows different sliding characteristics at different stag-es.Based on this,a multi-stage dynamic support method of roadway with weak interlayer based on"rein-forced bolt+prestressed anchor cable"support is proposed.Through the field test,the displacement of top and bottom is reduced by 48.3%,the displacement of two sides is reduced by 58.3%,and the roadway defor-mation is effectively controlled.