نوع مقاله : مقاله پژوهشی
نویسنده
Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسنده [English]
Confining pressures are one of the critical factors in causing damage to the rocks surrounding underground spaces. Analyzing the role of confining pressures on damage caused to rocks by considering the rock microstructure is a design requirement for rock engineering purposes. In this study, the damage of granite rock was investigated by generating irregular, medium-regular, and regular grain networks and applying confining pressures of 3, 6, 9, 12, and 15 MPa to the models using a combination of the grain-based model (GBM) and a constitutive damage model. The results of this study revealed that the trends of Weibull distribution parameters (m and F0) are more sensitive to irregular grain networks. In other words, with increasing confining pressures in irregular networks from 3 to 15 MPa, the values of m and F0 decreased and increased, respectively. Conversely, no clear trends were observed for the damage parameters of granite rocks with medium-regular and regular grain networks. Theoretically, it can be said that the more different the distribution of grains, the grain aspect ratio, the way grain boundaries collide with each other, and the number of boundaries that the crack passes through, cause differences in the failure pattern of the internal structure of the rocks. In this case, the crack chooses shorter paths to pass and failure the rock, which in turn will cause differences in the failure angles. Generally, the results of this study showed that the microstructure of rocks, as well as the external loads applied to rocks, play a significant role in the study of rock damage.
کلیدواژهها [English]
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