关键词: 动压巷道, 多次扰动, 失稳机理, 开采顺序

Abstract: The instability mechanism of 1113(1) working face mining roadway under repetitious disturbances during excavating in multi-seam mining environment has been studied by means of integrated research methods of numerical simulation, field measurement and theoretical analysis. According to the data calculated through simulating different mining sequences of four working faces in coal seam group, diverse mechanical environments of surrounding rock mass of mining roadway have been reproduced. The results show that the mining of 1113(1) working face activates disturbed overlying interlayer appearing continuous rock mass, discontinuous rock mass, and bulk solid structure, exacerbates wide range of constant severe deformation of 1113(1) working face mining roadway in shallow high stress environment, and the outstanding characteristic is large amount of floor heave in present mining conditions. That is the mechanical nature of instability of 1113(1) working face roadway. Mining sequences have a significant effect on the stability of surrounding rock of mining roadway in coal seam group mining. The deformation and destruction are also smallest by adopting downward mining and underlying mining. If adopting neighbor coal seams riding mining at the same time, failure area of the surrounding rock and deformation of 1113(1) working face mining roadway will be most severe in the environment of floor aggregate high stress of 1113(3) working face, 1113(1) working face mining disturbance, and the excavation of 1113(1) working face roadway. Downward mining should be adopted as the first choice, and multiple mining effect should be avoided.

Key words: dynamic pressure roadway, multiple disturbance, instability mechanism, mining sequence