DBPapers
DOI: 10.5593/sgem2011/s02.116

ESTIMATION OF ROCK MASS MODULUS USING ROCK MASS CLASSIFICATION SYSTEM

AUTHOR/S: J. GHOLAMNEJAD, M. RASTEGAR, H. BAHAADDINI
Monday 1 August 2011 by Libadmin2011

11th International Multidisciplinary Scientific GeoConference SGEM2011, www.sgem.org, SGEM2011 Conference Proceedings/ ISSN 1314-2704, June 20-25, 2011, Vol. 1, 445-450 pp

ABSTRACT

Rock mass deformation modulus is an important input parameter in any stability
analysis in the surface and underground structures. This parameter can be obtained
through in-situ tests, empirical relations between deformation modulus and rock mass
classification, and estimating from back analysis method. Field tests are developed to
determine this parameter directly, but these methods are time consuming and expensive.
Therefore, some researchers have proposed empirical formula for estimation of rock
mass modulus on the basis of characterization schemes such as RMR, Q, GSI, etc. In
this paper new empirical equations were proposed for empirical estimations of the
deformation modulus of rock mass based on an extensive data set gathering from the insitu
tests around the world by the help of DATAFIT software. Although the empirical
equations are simple, fast and cost-effective, the equations include some uncertainties
relating to the limited data availability, variability of rock type and the heterogeneous
nature of the rock masses.

Keywords: Rock mass, modulus of deformation, RMR.