ANALYSIS OF SHOCK ABSORPTION AND ANTI-IMPACT EFFECT OF ENERGY-ABSORBING SUPPORT IN ROADWAY

Rock burst is the main dynamic disaster of coal mining, the energy-absorbing support in roadway is a new support method and effective means to prevent rock burst disasters. The energy-absorbing support is a kind of roadway support formed by adding damping energy dissipation components up rigid supports. Based on the dynamic model of interaction between roadway roof and support, the dynamic response of the roof-support system with roadway rigid support and energy-absorbing support is analyzed, the influence of distributed characteristics of damping components on the effect of shock absorption and anti-impact is investigated, and the effect of energy absorption, shock absorption and anti-impact of damping components in support with series, and parallel as well as hybrid distributed characteristics are studied. The results show that: compared with the rigid support, the energy-absorbing support can effectively suppress the impact response of roof and has self-protection ability to the impact response of support body. The energy-absorbing support with series and hybrid connection have similar control effects on roof impact displacement and acceleration of support body, which are better than the energy-absorbing support with parallel connection. The roof impact displacement decreases by about 89% and the acceleration of support body decreases by about 55% in the energy-absorbing support with series connection. Further optimization of the series mode shows that: when the energy-absorbing components are arranged in series at the upper end of the support, the energy-absorbing effect of the component is the best, the deformation, stress and equivalent plastic strain of support body change smoothly and the amplitude is small, and the equivalent plastic strain of support body decreases by about 77% and 96% respectively compared with that of the lower end and the two ends connected in series. This study provides ideals for the dynamic reliability design of anti-impact and for the energy-absorbing support in the dynamic disaster of rock burst.