Santos Tatiana B, Lana Milene S, Santos Allan E M, Silveira Larissa R C
Departamento de Engenharia de Minas, Universidade Federal de Ouro Preto, Rua Diogo Vasconcelos, 122, 35400-000 Ouro Preto, MG, Brazil.
An Acad Bras Cienc. 2017 Apr-Jun;89(2):859-872. doi: 10.1590/0001-3765201720160065.
Many authors have been proposed several correlation equations between geomechanical classifications and strength parameters. However, these correlation equations have been based in rock masses with different characteristics when compared to Brazilian rock masses. This paper aims to study the applicability of the geomechanical classifications to obtain strength parameters of three Brazilian rock masses. Four classification systems have been used; the Rock Mass Rating (RMR), the Rock Mass Quality (Q), the Geological Strength Index (GSI) and the Rock Mass Index (RMi). A strong rock mass and two soft rock masses with different degrees of weathering located in the cities of Ouro Preto and Mariana, Brazil; were selected for the study. Correlation equations were used to estimate the strength properties of these rock masses. However, such correlations do not always provide compatible results with the rock mass behavior. For the calibration of the strength values obtained through the use of classification systems, stability analyses of failures in these rock masses have been done. After calibration of these parameters, the applicability of the various correlation equations found in the literature have been discussed. According to the results presented in this paper, some of these equations are not suitable for the studied rock masses.
许多作者提出了地质力学分类与强度参数之间的若干相关方程。然而，与巴西岩体相比，这些相关方程所基于的岩体具有不同的特性。本文旨在研究地质力学分类在获取巴西三个岩体强度参数方面的适用性。使用了四种分类系统，即岩体质量指标（RMR）、岩体质量（Q）、地质强度指标（GSI）和岩体指数（RMi）。研究选取了位于巴西欧鲁普雷图和马里亚纳市的一个坚硬岩体以及两个不同风化程度的软弱岩体。使用相关方程来估算这些岩体的强度特性。然而，这种相关性并不总是能提供与岩体行为相符的结果。为了校准通过使用分类系统获得的强度值，对这些岩体中的破坏进行了稳定性分析。在对这些参数进行校准之后，讨论了文献中发现的各种相关方程的适用性。根据本文给出的结果，其中一些方程不适用于所研究的岩体。
