3D Characterization of Uniaxial Compressive Strength of Transversely-Isotropic Intact Rocks

IF 1.1 Q3 MINING & MINERAL PROCESSING
V. Maazallahi, A. Majdi
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引用次数: 1

Abstract

The uniaxial compressive strength (UCS) of intact rocks is one of the key parameters in the course of site characterizations. The isotropy/anisotropy condition of the UCS of intact rocks is dependent on the internal structure of the rocks. The rocks with a random grain structure exhibit an isotropic behavior. However, the rocks with a linear/planar grain structure generally behave transversely-isotropic. In the latter case, the UCS of intact rocks must be determined by a set of laboratory tests on the oriented rock samples. There are some empirical relations available to describe the strength of these rocks. Though characterization of transversely-isotropic rocks is practically a 3D problem, but these relations provide only a 2D description. In this paper, a method is proposed to provide a 3D description of UCS of transversely-isotropic rocks. By means of this formulation, one can determine UCS along with any arbitrary spatial direction. Also, a representative illustration of UCS is proposed in the form of contour-plots on a lower hemisphere Stereonet. The method is applied to an actual case study from the Kanigoizhan dam site located in the Kurdistan Province (Iran). Application of the proposed method to the phyllite rocks of this site show that the direction perpendicular to the dam axis exhibits the most anisotropic behavior. Hence, it is essential to take the strength anisotropy into account during the relevant analysis. The results obtained, together with the statistical variation of UCS, provide a practical approach to select the proper values of UCS according to the scope of the analysis.
横向各向同性完整岩石单轴抗压强度三维表征
完整岩石的单轴抗压强度(UCS)是现场表征过程中的关键参数之一。完整岩石UCS的各向同性/各向异性条件取决于岩石的内部结构。具有随机颗粒结构的岩石表现出各向同性行为。然而,具有线性/平面晶粒结构的岩石通常表现为横向各向同性。在后一种情况下,完整岩石的无侧限抗压强度必须通过一组定向岩石样本的实验室测试来确定。有一些经验关系可以用来描述这些岩石的强度。尽管横向各向同性岩石的表征实际上是一个三维问题,但这些关系只能提供二维描述。本文提出了一种横向各向同性岩石无侧限抗压强度的三维描述方法。通过该公式,可以确定沿任意空间方向的UCS。此外,还以下半球立体网上的等高线图的形式提出了UCS的代表性说明。该方法应用于位于伊朗库尔德斯坦省Kanigoizhan坝址的实际案例研究。将该方法应用于该场地的千枚岩表明,垂直于坝轴线的方向表现出最具各向异性的行为。因此,在相关分析过程中必须考虑强度各向异性。所获得的结果,加上UCS的统计变化,为根据分析范围选择合适的UCS值提供了一种实用的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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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