The conditions for strain burst and seismic rockburst are first introduced and a ball-cliff conceptual model for rockburst is proposed in the paper. Cases of strain burst and seismic rockburst in two metal mines are presented. Strain burst is caused by stress concentration，which is usually in a small magnitude and limited to a shallow depth in the country rock. Strain burst usually occurs in the initial excavation in a depth of more than 1 000 m. Strain burst becomes significantly decreased both in number and magnitude，and could disappear completely，during excavation in disturbed/damaged rock masses. Seismic rockburst is related to slippage of pre-existing faults or creation of new faults. The magnitude of seismic rockburst spreads in a wide range and strong seismic rockburst would bring about rock damage in a larger range than strain burst does. The changes of rockburst support methods are briefly reviewed in the paper. The rockburst support experienced an evolution process from soft support，hard support to high energy support. The theoretical bases of the methods are introduced. At present，the widely used rockburst support method is to use high-energy yielding rockbolts and high-strength surface restraint support components like wire meshes and wire straps. The ideal rockburst support should be able to effectively transform rockburst energy into deformation energy of the support components and rock fracture energy to weaken the surrounding rock.
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2019, Vol. 38 
