Abstract:

The fracture of underground rock mass in Zhangfushan mining area of Jinshandian Iron

Mine is developed，and the stability of roadway under the original support scheme is poor.In view of this

problem，the support measures are improved on the basis of the original support scheme，and the displace⁃

ment，stress and plastic zone of the scheme are calculated and analyzed by using 3DEC numerical simula⁃

tion software. Finally，a reliable support scheme is selected.The results show that the anchor cable can effec⁃

tively limit the displacement of the surrounding rock of the roadway，especially has a better effect on control⁃

ling the roof settlement of the roadway.The side wall of the surrounding rock of the roadway is mainly subject⁃

ed to tensile stress，the near rock mass of the roof and floor is mainly subjected to tensile stress，and the far

rock mass is mainly subjected to compressive stress.The plastic zone is obviously controlled by the fracture

occurrence，and the tensile and shear failure of the surrounding rock of the roadway coexists，and the shear

failure volume is much larger than the tensile failure volume.Based on the displacement，stress distribution

and plastic zone range of each support scheme，the roadway stability of the support scheme using spray an⁃

chor net + anchor cable is the best.

Key words:

fractured rock mass, roadway support, DFN fracture reconstruction, roadway stability