Abstract
Rock engineering occupies an important position in the 21st century. In the face of rock engineering disasters, we are only looking for the essential problems through experiments on rocks, but rock experiments cannot be realized in large numbers, so the article uses numerical simulation software RFPA (Realistic Failure Process Analysis) 2D Basic to simulate rock under different size conditions numerically. In this paper, a rock model with a diameter of 50 mm is used for simulation research. Meanwhile, five calculation models of height-to-diameter ratios of 1.0, 1.5, 2.0, 2.5, and 3 are used. Through simulation calculation, we find that the rock model failure is more than complicated when the value of the height-to-diameter ratio is exceedingly low (1), but as the height-to-diameter ratio increases, the failure mode will become simpler. The stress-concentrated failure will be in the form of axial failure. When the height-to-diameter ratio increases (1.5–2), other damage cracks appear on the basis of axial cleavage failure. As the height-to-diameter ratio continues to increase (about 2.5), only shear failure occurs. When the height-to-diameter ratio reaches a relatively high level (3), there will be both axial rip and other damage. When the height-to-diameter ratio is oversize, there will be both axial rip failure and end damage.
Highlights
With the advancement of science and technology, in order to meet human needs for resources and production space, the development scale of underground space is getting larger and the depth is getting deeper; besides, the problems of rock engineering encountered are becoming more and more complicated. erefore, further comprehensive exploration of the contents of rock geological characteristics, physical properties, mechanical properties, and other aspects has become a problem to be solved urgently [1,2,3].In the 21st century, rock engineering occupies an important position
E RFPA software mainly simulates the failure process of brittle media, and it uses the degree of homogeneity (m) to describe the heterogeneity of brittle media, which is in line with the destruction nature of brittle rock masses. e acoustic emission energy of the whole process of brittle rock mass destruction can be continuously simulated and displayed, which can realize the comparative analysis of acoustic emission characteristics of brittle rock masses of various sizes [15]. erefore, the RFPA software is chosen to study the failure mechanism of uniaxially compressing rocks under different loading rates
The advantages of RFPA (Rock Fracture Process Analysis) software are used to reproduce the physical experiment of rock through numerical simulation, which avoids the disadvantages of physical experiment
Summary
Received 13 October 2020; Revised 30 November 2020; Accepted 19 December 2020; Published 15 January 2021. A rock model with a diameter of 50 mm is used for simulation research. Five calculation models of height-to-diameter ratios of 1.0, 1.5, 2.0, 2.5, and 3 are used. Rough simulation calculation, we find that the rock model failure is more than complicated when the value of the height-to-diameter ratio is exceedingly low (1), but as the height-to-diameter ratio increases, the failure mode will become simpler. When the height-to-diameter ratio increases (1.5–2), other damage cracks appear on the basis of axial cleavage failure. As the height-to-diameter ratio continues to increase (about 2.5), only shear failure occurs. When the height-to-diameter ratio reaches a relatively high level (3), there will be both axial rip and other damage. When the height-to-diameter ratio is oversize, there will be both axial rip failure and end damage
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