Compressive Failure Analyses of Rock-Like Materials by Experimental and Numerical Methods
Publish place: Journal of Mining and Environment، Vol: 12، Issue: 3
Publish Year: 1400
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JMAE-12-3_012
تاریخ نمایه سازی: 18 مهر 1400
Abstract:
Investigating the crack propagation mechanism is of paramount importance in analyzing the failure process of most materials. This process may be exposed during each kind of loading on the materials. In this work, the cracking mechanism in rock-like materials is studied using the numerical methods and compared with the experimental test results. However, the mechanism of crack growth in brittle materials such as rocks is influenced by different parameters. This research work focuses on the effect of the initial crack angles on the crack growth paths of these materials. Some cubic samples containing pre-existing cracks are tested in compression by considering different flaw orientations. The specimens are made of cement, water, and sand. Moreover, the mentioned process is numerically simulated using three different methods: the finite difference method for discontinuous bodies or discrete element method, the displacement discontinuity method, and the versatile finite element method. The micro-parameters for simulation are gained by the trial-and-error procedure for the discrete element method. Eventually, the crack growth paths observed in the experiments are compared with the numerically simulated models. The results obtained show that these central cracks propagate in two ways, which are dependent on their initial angle. By increasing the initial crack angle to greater than ۳۰° (α > ۳۰°), the wing crack path moves further away from the initial crack, and by decreasing α to smaller than ۳۰° (α < ۳۰°), only the shear cracks are initiated. Therefore, the validity and accuracy of the results are manifested by comparing all the corresponding results obtained by different methods. Based on these results, it can generally be concluded that the strength of the cubic (rock material) specimens increases with increase in the crack angles with respect to the applied loading direction.
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Authors
M. Yavari
Department of Mining Engineering, Bafgh Branch, Islamic Azad University, Bafgh, Iran
H. Haeri
State Key Laboratory for Deep GeoMechanics and Underground Engineering, Beijing, China
V. Sarfarazi
Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran
M. Fatehi Marji
Mine Exploitation Engineering Department, Faculty of Mining and Metallurgy, University of Yazd, Yazd, Iran
H. A. Lazemi
Department of Mining Engineering, Bafgh Branch, Islamic Azad University, Bafgh, Iran
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