Research and practice of perimeter rock support technology for deep high-stress roadway

Aiming at the problem of a large range of loosening circle of the surrounding rock in the transport roadway of 8320 working face in Fowu Mine, the causes of deformation and damage of the surrounding rock in the roadway were analysed, and the joint support scheme of "anchor rod + anchor cable + metal mesh + anti-bottom arch + concrete" was put forward. FLAC^3D numerical simulation software was used to simulate the distribution of vertical and horizontal stresses in the peripheral rock under the original and optimised support schemes, which verified the effectiveness of the scheme and was successfully applied in field practice. The results show that the deformation rate of the peripheral rock of the roadway is large at the beginning, and gradually tends to be stable after 55 d. During the monitoring period, the maximum subsidence of the top plate, the maximum convergence of the two gangs, and the maximum bottom bulge were 59.1 mm, 48.1 mm, and 66.7 mm, respectively; the subsidence rate of the top plate was reduced to 0.02 mm∙d⁻¹, the convergence rate of the two gangs to 0.02 mm∙d⁻¹, and the rate of the bottom bulge was reduced to 0.01 mm∙d⁻¹. The effect of this support scheme in the control of the stability of the peripheral rock of the roadway was remarkable.