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Symmetry 2019, 11(2), 131; https://doi.org/10.3390/sym11020131

Numerical Research on Energy Evolution in Granite under Different Confining Pressures Using Otsu’s Digital Image Processing and PFC2D

1
College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2
State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao266590, China
*
Author to whom correspondence should be addressed.
Received: 5 January 2019 / Revised: 18 January 2019 / Accepted: 19 January 2019 / Published: 23 January 2019
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Abstract

Research on energy accumulation and releasing in the rock plays a key role on revealing its failure mechanism. This paper establishes a microscopic structure model of granite using Otsu digital image processing (DIP) technology and particle flow code software (PFC2D). A series of numerical compression tests under different confining pressures were conducted to investigate the macro and micro characteristics of energy evolution in granite. The results showed that the energy evolution of granite is divided into three stages: stable accumulation, slow dissipation, and rapid release. With increasing confining pressure, the strain energy accumulation ratio decreased exponentially and the peak value of strain energy increased linearly. It was found that the energy accumulation speed in the pre-peak stage increased as a linear function, while the energy release speed in the post-peak stage decreased as an exponential function. In addition, the feldspar is the main microstructure which played a major part in accumulating energy in granite. However, the unit mineral energy of mica particles was bigger than that of feldspar and quartz. When subjected to increasing confining pressure, the feldspar’s total energy growth rate was fastest. Meanwhile, the mica’s unit energy growth rate was fastest. View Full-Text
Keywords: granite; energy evolution; confining pressure; microstructures; Otsu’s method; PFC2D granite; energy evolution; confining pressure; microstructures; Otsu’s method; PFC2D
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Zhang, Y.; Zhao, T.; Yin, Y.; Tan, Y.; Qiu, Y. Numerical Research on Energy Evolution in Granite under Different Confining Pressures Using Otsu’s Digital Image Processing and PFC2D. Symmetry 2019, 11, 131.

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