Central Soil and Materials Research Station, New Delhi, India
Online published on 18 September, 2018.
Deformation modulus of rock mass is an important parameter for all geotechnical applications. However, its determination is highly expensive and time consuming. For this reason, rock engineers and engineering geologists have proposed numerous empirical equations for estimation of deformation modulus based on rock mass and intact rock properties. In the present study, validity of existing empirical equations has been undertaken. The data obtained from medium grained grey sandstone rock mass of Dagshai and Kasauali formation of Indian Himalaya by uniaxial jacking tests was used. The tested rock mass are medium to strong sandstone. Rock mass rating (RMR), rock tunnelling quality index (Q) and geological strength index (Qc) were used for estimation of deformation modulus. The deformation modulus values of rock mass using empirical relations were calculated. Among the empirical equations, none of them could estimate the modulus values comparable to the actually measured. Further, in this study, the influence of geological features on deformability characteristics has also been studied.
