Numerical analysis of burst of soft rock and the rate criterion

摘要

The burst of soft rock is studied by Software ANS YS in this paper. By analyzing the generated data, the criterion of generalized stress (or strain) rate is proposed as a means to predict rockburst occurrence. In detail, this approach has the following features: during rockburst, the stress and the strain change more rapidly at the location nearer to the burst point than at any other location at the same time; and also the two valuables vary faster at the moment nearer to the burst point than at any other moment considering the same location. As a practice, the criterion is employed to forecast the rockburst during the extracting, and a rational conclusion is obtained.