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ESTIMATION OF ROCK MASS MODULUS USING ROCK MASS CLASSIFICATION SYSTEM
Abstract
Rock mass deformation modulus is an im portant input parameter in any stability analysis in the surface and underground structures. This parameter can be obtained through in-situ tests, empirical relations be tween 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 in- situ 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 av ailability, variability of rock type and the heterogeneous nature of the rock masses.
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