关键词: 封闭柔性支护, 底板冲击矿压, 抑制, 数值模拟

Abstract: In view of the support technique of coal seam roadway with floor burst hazard, theoretical analysis and numerical simulation methods were used in this paper to study the control function of closed compressible supporting structure made up of anchor net and “O” type shed on floor burst. The results show that high horizontal stress is also distributed in the roadway floor supported with the closed compressible supporting structure, and floor burst risk also exists, compared to the other supporting forms in similar mining geological conditions. Under the dynamic load disturbance, floor burst may happen with the displacement increasing suddenly and the horizontal stress reducing at the same time. However, the roadway does not show obvious floor failure but radial deformation of surrounding rock, and the deformation is relatively small, which shows that the closed compressible supporting structure can’t eliminate rock burst hazard entirely, but can reduce the damage degree. The results can provide reference to roadway support in similar coal mine conditions.

Key words: closed compressible support structure, floor burst, controlling, numerical simulation