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Abstract
Herein, a finite discrete element method was used to simulate the rockburst phenomenon of elliptical caverns with different axis ratios. Two situations were employed, namely when the disturbance direction is perpendicular and parallel to the ellipse. Based on the peak stress, maximum velocity, stress nephogram, and image fractal characteristics, the influence of axis ratio and direction of the disturbance on rockburst were analyzed. The results show that the samples with different axis ratios experienced the same process of quiet period, slab cracking period, and rockburst. The rockburst pit had V shape, and the failure modes of rockburst primarily included shear cracks, horizontal tension cracks, and vertical tension cracks. With the rise in axis ratio, the peak stress and maximum speed increased. Furthermore, the pressure area on the left and right sides of the sample cavern decreased when the disturbance direction was parallel to the short axis of the ellipse, while it increased for the sample with a disturbance direction perpendicular to the short axis. The fractal dimension value of the crack was gradually amplified with disturbance. The fractal dimension value of the sample whose disturbance direction was perpendicular to the minor axis of the ellipse was lower, and it was more difficult to damage.
Highlights
Tunnel is the main part of underground engineering [1,2]
Under the same axis ratio conditions, the peak strength value of the VD sample was higher, indicating that the load level was higher. These results show that the sample with the disturbance direction perpendicular to the short axis of the ellipse can clearly increase the bearing capacity of the cavern structure and slow the damage of the rockburst
These results show that the sample with the disturbance direction perpendicular to the short axis of the ellipse can clearly increase the bearing capacity the cavern structure and(V-50), slow (b) theH-40, damage of the
Summary
Tunnel is the main part of underground engineering [1,2]. Rockburst is a common disaster in underground engineering. Research on the mechanism of rockburst is of great significance in the construction arena. The current research on the rockburst mechanism has primarily focused on laboratory tests. With the development of science and technology, an increasing number of numerical analysis software sets have been developed. Numerical analysis software sets have the advantages of a low cost and ease of operation, and can provide information that cannot be obtained in experiments; they are widely used in rockburst research. The emergence of related numerical software has greatly promoted the development of rock mechanics and has provided a convenient and effective method for the design and analysis of on-site engineering [5]. Common rockburst simulation methods include finite element methods (FEM), finite difference methods (FDM), discontinuous deformation methods (DDA), discrete element methods (DEM), etc
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