Damage, failure and stability control of evolutionary process caused by re-exploitation of the residual resources

Abstract

On the basis of considering the heterogeneity and using the finite element numerical simulation, this thesis investigates the damage of the roof and coal as well as the failure of evolutionary process during the re-exploitation of the residual coal. According to the analysis of the damage field, stress field and the failure process, it explores the damage evolution, stress distribution laws and the damage models. Besides, this thesis puts forward the idea of penetrating and establishing drilling steels aimed at solving the problem of wall carving and roof fall, meanwhile this suggestion accomplishes the successful application effect in the testing ground. This thesis demonstrates that the re-exploitation of the residual coal can be carried out and the safe production can be ensured by adopting some measures. What’s more, the research result provides the theoretical and practical experience for the re-exploitation of the residual coal in the similar conditions.