Abstract: In order to extend the service life of the instable brickwork roadway, the instability mechanism and reinforcement technology were studied by analytical method and engineering practice. The results show that the vault wall back cavity or the spandrel wall back cavity are easily generated in the brickwork roadway because of the influence of over excavation, mining pressure, erosion of groundwater and so on. The interaction between brickwork structure and surrounding rock can make the bending compress stress in the local brickwork structure exceed the compress strength of the brickwork structure when the size of cavity reaches a level. This leads to instability of the brickwork roadway. In addition, the control effect of comprehensive reinforcement technology play an important role, which combined with wall back filling, grouting and bolt support based on amelioration of the brickwork support loading, improvement of surrounding rock strength and increment of the support resistance for the instable brickwork roadway.

Key words: brickwork, wall back cavity, support resistance, grouting, bolt support