Experimental study on static and dynamic mechanical properties of supporting materials and components in Binchang mining area

JIAO Biao; FENG Youliang; HUANG Yiliang; ZHOU Penghe

doi:10.11799/ce202512009

Abstract：To provide design basis for surrounding rock support of rock burst roadway in Binchang mining area,support materials and components commonly used in roadway support system were selected for static and impact dynamic load tests.We systematically analyzed the static mechanical properties of bolts,anchor cables,trays and metal meshes,as well as the mechanical response characteristics and failure modes under the action of impact dynamic load.The test results show that:under the action of static load,the ultimate bearing capacity of the bolt specimen is 293.7 kN,and the elongation rate is 12.5％.The tensile strength of the anchor cable specimen reaches 1980 MPa,and the elongation rate is 9.9％.The compression load-deformation curve of the bolt tray develops in multiple stages,and the maximum load is 386 kN.Under the action of drop hammer impact,the impact force-displacement curve of the bolt varies in three stages:the elastic stage,the plastic stage and the rebound stage.The bolt can withstand a maximum of 8 rounds of impacts,with an impact elongation rate of 9.98％,and its brittleness is enhanced.The impact force-displacement curve of the anchor cable develops in four stages:tightening,rapid growth,stable deformation and rebound.The maximum peak value of the impact force is 550 kN,the elongation rate under dynamic load is 1.57％,and the absorbed energy is 1.35×104 J.The impact force-displacement curves of the butterfly bolt tray and the W-shaped tray successively go through four stages:slow growth,linear growth,steady growth and sharp decay.Compared with the butterfly bolt tray,the W-shaped bolt has smaller impact resistance in early stage.The impact force-displacement curve of the metal mesh roughly goes through three stages:linear growth,violent fluctuation and rapid decay.With the increase of the impact energy,the peak value of the impact force basically shows an increasing trend,the deformation continues to increase,the mesh basically maintains its original shape,and it has good cushioning performance.