Isaac Scientific Publishing

Geosciences Research

Comparison between the In Situ Tests’ Data and Empirical Equations for Estimation of Deformation Modulus of Rock Mass

Download PDF (1362.5 KB) PP. 47 - 59 Pub. Date: November 28, 2016

DOI: 10.22606/gr.2016.11005

Author(s)

  • Mohsen Rezaei
    Geology Departement, Ferdowsi University of Mashhad, Iran
  • Mohammad Ghafoori*
    Geology Departement, Ferdowsi University of Mashhad, Iran
  • Rasoul Ajalloeian
    Geology Departement, Isfahan University, Iran

Abstract

The rock mass deformation modulus (Erm) is a significant input parameter in any analysis of rock mass behavior. To find Erm, both in situ tests as well as indirect methods can be utilized. The in situ tests are not only time consuming and expensive, but also the reliability of these tests’ results is sometimes questionable. Therefore, several researchers have proposed empirical equations for estimating Erm on the basis of rock mass classification systems or geomechanical properties of rock mass. In this paper, these equations are reviewed based upon data obtained from a large number of in situ tests performed in Bakhtiari and Khersan II dam sites- in southwest parts of Iran. Among the equations related to rock mass rating (RMR), the ones provided by Hoek-2002 and Shen-2012 have presented the best predictions. It appears that Hoek-2002 equations have provided more acceptable results than other equations correlated to geological strength index (GSI).

Keywords

mass deformation modulus, in situ test, indirect methods, Bakhtiari dam, Khersan II dam.

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