Abstract
In order to strengthen the prediction of rockburst and inquire the relationship between the rockburst proneness of rock and its surface fractal characteristic, the surface fractal of the rock was studied by fractal method and uniaxial compression test. The change rules of surface fractal of different types of rock were compared by calculating its fractal dimension of rock before experiment and after experiment. Based on the prediction results, we found that the dimension after test is bigger than before test for four kinds of rocks. The rock with stronger rockburst proneness has more intense failure in the loading process and its crack morphology is more complex.
Highlights
With the great progress of social and economic, more and more underground engineering gradually developed deeper
We study the change rule of rock’s surface fractal dimension by collecting and analyzing the surface characteristic of rock before and after test
We study the relationship between surface fractal dimension and the rockburst proneness
Summary
With the great progress of social and economic, more and more underground engineering gradually developed deeper. Rockburst is a nonlinear dynamic phenomenon that rock mass along the international airport of excavation surface release energy [1]. It is a complicated problem and there is neither a set of mature theory in use of prediction in nor systematic and comprehensive understanding its reasons because of complicated problems existing in the rockburst and different theories of grading. Fractal geometry was introduced to analysis the rock damage and fracture by Xie Heping, and it indicates a new development direction for rockburst[3]. Recent researches showed that the fractal phenomenon is remarkable during the breaking process of rock fracture. We study the relationship between surface fractal dimension and the rockburst proneness
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