Experimental study on dynamic mechanical properties of mining anchor mesh

YUAN Xinliang; WU Yongzheng; ZHOU Penghe

doi:10.11799/ce202404018

Abstract：To reasonably select mesh for rock bolt support in rock burst roadways,a comparative study was conducted on the dynamic mechanical properties of commonly used machine welded steel mesh and steel plastic composite polyester mesh in coal mines,including deformation,bearing capacity,displacement,and energy absorption,using laboratory testing methods and a drop hammer impact testing machine.The deformation,failure mode,and energy absorption characteristics of the mesh under impact load were obtained.The research results indicate that under impact load,the failure and deformation concentration areas of machine welded steel mesh and steel plastic composite polyester mesh are different.The machine welded steel mesh deforms in a cross-shape towards the center,and the failure mainly concentrates at the contact between the steel mesh and the fixed pressure plate.The failure of steel plastic composite polyester mesh mainly concentrates at the center of the impact load and the contact between the polyester mesh and the fixed pressure plate;The time history curve of the impact force of the mesh can be divided into slow bearing stage,fluctuating stable bearing stage,and attenuation stage.As the impact load increases,the peak impact force of the machine welded steel mesh is significantly greater than that of the steel plastic composite polyester mesh.The machine welded steel mesh has stronger support ability for the rock burst roadway;The displacement and deformation of the mesh gradually increase with the increase of impact energy.Machine welded steel mesh can resist impact energy greater than 5000 J,and steel plastic composite polyester mesh can resist impact energy of 2000 J.The test results can provide a reference for the selection of anchor mesh in different support areas of the rock burst roadway.