Comparison of laboratory and field modulus of elasticity of rocks

The modulus of deformation is undoubtedly the geomechanical parameter that best represents the mechanical behavior of rock mass. In particular, when it comes to underground excavations, this modulus becomes indispensable---whatever the type of design approach to be developed.A literature review was conducted to explain the use of different types of rock mass classifications, as well as different types of in situ and dilatometer testing techniques for estimating and determining of modulus of deformation in the rock.Series of in situ dilatometer tests were conducted to determine the modulus of deformation of the rock mass and to compare them with the physical properties results obtained by static and dynamic laboratory testing on core specimens.The major goal of the work presented here is to find a correlation between in situ modulus of deformation with different type of rock mass classifications, physical properties of the rock and static and dynamic modulus of elasticity determined by laboratory testing