Nonlinear Dynamics Mechanism of Rock Burst Induced by the Instability of the Layer-Crack Plate Structure in the Coal Wall in Deep Coal Mining

Abstract EN

The instability of layer-crack plate structure in coal wall is one of the causes of rock burst.

In the present paper, we investigate the formation and instability processes of layer-crack plate structure in coal wall by experiments and theoretical analysis.

The results reveal that layer-crack plate structure formed near the free surface of the coal wall during the loading.

During the formation of the layer-crack plate structure, the lateral displacement curve of the coal wall experiences a jagged variation, which suggests the nonlinear instability failure of the coal wall with a sudden release of the elastic energy.

Then, a dynamic model for the stability analysis of the layer-crack plate structure was proposed, which takes consideration of the dynamic disturbance factor.

Based on the dynamic model, the criterion for dynamic instability of the layer-crack plate structure was determined and demonstrated by an example.

According to the analytical results, some control methods of dynamic stability of the layer-crack plate structure was put forward.