There are quantity of steep seams whose angle are generally from 65° to 87° in the Wulumuqi Coal Region. Owing to the effect of the original non-symmetrical distribution of stress state and local defor-mation, the process of excavation disturbance led to obvious local nonsymmetrical distribution of stress in the surrounding rock mass of the horizontal sub-level top-coal caving workings, thereby the large scale destabiliza-tion and dynamic hazard occurred. In this paper, firstly, the special characteristics of rock mass conditions were investigated; Afterwards, the simplified mechanical model of surrounding structure were outlined; finally, insitu acoustic emission (AE) characteristic indicators monitoring and rock mass damage borehole optic peeping were carried out. The dynamic destabilization process of damage-deformation-fracturemovement-instability was illustrated.
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