When rock burst occurs in underground coal mine,the impact failure of mine hydraulic support often causes the destruction of roadway support system,which leads to roadway collapse and causes mine accidents.At present,it is one of the effective ways to prevent roadway rock burst by adding energy-absorbing components to improve the anti-shock support performance of support.However,different types of energy-absorbing components have different deformation patterns of crushing and exhibit different energy-absorbing and mechanical properties.In this paper,the numerical method is used to simulate the impact crushing of energy-absorbing components with different types,supports and wall thicknesses,and the relevant anti-impact energy-absorption parameters are analyzed.The comparative analysis of three different types of energy-absorbing components shows that:the pre-folded energy-absorbing components has the largest support reaction force and good energy-absorbing capacity,but the stability of the deformation process is poor;the outward-folded energy-absorbing components has strong plastic deformation capacity and the largest effective yielding stroke,but the support force is small and not suitable for individual use;the expanded energy-absorbing components has the best stability of the deformation process and its radial displacement after plastic deformation is small,saving Work space,but the support capacity is poor,suitable for small hydraulic support or used for other special purposes.
关键词
吸能构件/冲击地压/吸能特性/防冲液压支架
Key words
energy-absorbing components/rock-burst/energy-absorption characteristics/anti-impact hydraulic support
维普
万方数据