类岩材料压缩破坏的实验与数值分析

IF 1.1 Q3 MINING & MINERAL PROCESSING
M. Yavari, H. Haeri, V. Sarfarazi, M. F. Marji, H. A. Lazemi
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引用次数: 0

摘要

在分析大多数材料的失效过程中,研究裂纹扩展机制至关重要。该过程可能在材料上的每种装载过程中暴露出来。本文采用数值方法研究了类岩石材料的开裂机理,并与试验结果进行了比较。然而,岩石等脆性材料的裂纹扩展机制受到不同参数的影响。本研究工作的重点是初始裂纹角度对这些材料裂纹扩展路径的影响。通过考虑不同的缺陷方向,对一些含有预先存在的裂纹的立方体样品进行压缩试验。这些样品是由水泥、水和沙子制成的。此外,使用三种不同的方法对上述过程进行了数值模拟:不连续体的有限差分法或离散元法、位移不连续法和通用有限元法。通过离散元法的试验和误差程序,获得了用于模拟的微观参数。最后,将实验中观察到的裂纹扩展路径与数值模拟模型进行了比较。结果表明,这些中心裂纹有两种扩展方式,这取决于它们的初始角度。通过将初始裂纹角增加到大于30°(α>30°),翼裂纹路径进一步远离初始裂纹,并且通过将α减小到小于30°(a<30°),仅引发剪切裂纹。因此,通过比较不同方法获得的所有相应结果,表明了结果的有效性和准确性。基于这些结果,通常可以得出结论,立方体(岩石材料)试样的强度随着相对于施加载荷方向的裂纹角的增加而增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The compressive failure analysis of rock-like materials by experimental and numerical methods
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 30° (α > 30°), the wing crack path moves further away from the initial crack, and by decreasing α to smaller than 30° (α < 30°), 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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来源期刊
Journal of Mining and Environment
Journal of Mining and Environment MINING & MINERAL PROCESSING-
CiteScore
1.90
自引率
25.00%
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