2002•Journal of Central South University of Technology(Natural Science)Requires access
Analysis and prediction of rock burst dangerous areas in Dongguashan Copper Mine under deep well mining
Tang Li
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Abstract
Dongguashan Copper Mine is a new and the first deep hard rock metal mine in China. The distribution of the rock burst proneness of the rock strata of Dongguashan Copper Mine is determined with the results of tension tests, total stress strain tests and tests of stress relaxation after peak strength, and the geological structure and distribution of rocks of the deposit. The characteristics of the actual rock bursts occurring in the development workings surrounding rocks in the deposit are analyzed. Prediction of rock burst dangerous areas of stope surrounding rocks in the course of mining is carried out by means of numerical simulation method, in which the ratio of the maximum tangential stress at stope perimeter to rock uniaxial compressive strength is used as the criterion of rock burst. The results show that rock burst proneness of the ore body and its foot wall rocks is moderate and that of the hanging rocks is weak, the rock burst proneness is inductive, and that rock bursts occur in areas where the rock burst proneness and stress are larger and energy stored in rocks can be released violently, which is mainly located in the cross of workings, the hard rock side of different rock contact zone, and the roof and corners of stope and ore pillars.