Research and practice of surrounding rock supporting technology in deep composite roof roadway

Aiming at the problems of serious roof subsidence and poor reinforcement support during the tunneling process of the composite roof roadway in Dongtan Mine, the deformation and damage characteristics of the composite roof roadway and the principle of support were analysed through the combination of on-site monitoring, theoretical analysis and numerical simulation, and the spacing of the rows of anchors between the “2400 mm×2400 mm, 2-2” arrangement was adjusted to “1600 mm×1600 mm, 2-3-2” arrangement for the original roadway support scheme, and the feasibility of the support parameters was verified through numerical simulation. The arrangement of “2400 mm×2400 mm, 2-2” in the original support scheme is adjusted to “1600 mm×1600 mm, 2-3-2”, and the feasibility of the support parameters is verified by numerical simulation. Through on-site measurement, the amount of roof subsidence and anchor cable force were controlled within 56mm and 260kN respectively, which effectively controlled the deformation and damage of the roadway roof.