Fault fracture zone is a common geological structure in coal mining.Large deformation and even collapse often occur in tunnels passing through fault fracture zone,which limits the safe and efficient production of mines.Based on the engineering background of material tunnel in 16205 working face of Binhu Coal Mine,this paper studies the characteristics and causes of deformation damage of tunnel surrounding rock under the influence of fault fracture zone through field investigation,and puts forward the combined support scheme of"closed U-shaped steel frame+shotcrete+grouting+anchor mesh cable",and carries out field industrial test.The results show that within 90 days of observation,the maximum deformation of the roof,floor and two sides of the tunnel is 81 mm and 49 mm respectively,and the surface of the tunnel is smooth without concrete cracking and bolt fracture.
fault fracture zonedeformation damagecombined supportfield test
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