Abstract
Hard rock masses are encountered in a majority of countries and extensive underground excavation work is being carried out through such rocks. This chapter discusses the engineering properties of hard rock masses. The properties of hard rock masses are required for designing engineering structures. Hard rock is defined as rock material having uniaxial compressive strength (UCS) of more than 100 MPa. On the other hand, hard rocks are geologically very old and have well developed and highly weathered joints. Therefore, there are serious problems of rock falls and seepage in tunnels due to such joints, if left unsupported. In the case of rock foundations, knowledge of deformation modulus of rock masses is of prime importance. The geomechanics classification is a useful method for estimating insitu deformability of rock masses.
Published Version
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