A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Estimation of rock mass deformation modulus and strength of jointed hard rock masses using GSI system
Rock mass characterization is required for many applications in rock engineering practice including design of excavations, supports and stopes for these purposes, it is necessary to obtain design input parameters such as deformation moduli and strength parameters for numerical modeling. Although such parameters can ultimately be determined from in situ tests, at the preliminary design stage, where access to underground is limited, the practical way to obtain these parameters is to apply a rock mass classification system to characterize the rock mass and estimate the rock mass properties. Many classification systems, such as RQD, Rock Mass Rating, Q and Geological Strength Index (GSI) systems, have been developed. Amongst them, the Q system is widely used for rock support system design and the GSI system is used for estimating design parameters. The GSI system is the only rock mass classification system that is directly linked to engineering parameters such as Mohr-Coulomb, Hoek-Brown strength parameters or rock mass modulus. However, the application of the existing GSI system is hindered by the facts that the use of the system is to some extent subjective and requires long-term experience. A quantitative approach to assist in the use of the GSI system is presented. It employs the block volume and a joint condition factor as quantitative characterization factors. The approach is built on the linkage between descriptive geological terms and measurable field parameters such as joint spacing and joint roughness. It adds quantitative means to facilitate use of the system, especially by inexperienced engineers. The GSI system is applied to characterize the jointed rock masses at two underground powerhouse cavern sites in Japan.
Estimation of rock mass deformation modulus and strength of jointed hard rock masses using GSI system
Rock mass characterization is required for many applications in rock engineering practice including design of excavations, supports and stopes for these purposes, it is necessary to obtain design input parameters such as deformation moduli and strength parameters for numerical modeling. Although such parameters can ultimately be determined from in situ tests, at the preliminary design stage, where access to underground is limited, the practical way to obtain these parameters is to apply a rock mass classification system to characterize the rock mass and estimate the rock mass properties. Many classification systems, such as RQD, Rock Mass Rating, Q and Geological Strength Index (GSI) systems, have been developed. Amongst them, the Q system is widely used for rock support system design and the GSI system is used for estimating design parameters. The GSI system is the only rock mass classification system that is directly linked to engineering parameters such as Mohr-Coulomb, Hoek-Brown strength parameters or rock mass modulus. However, the application of the existing GSI system is hindered by the facts that the use of the system is to some extent subjective and requires long-term experience. A quantitative approach to assist in the use of the GSI system is presented. It employs the block volume and a joint condition factor as quantitative characterization factors. The approach is built on the linkage between descriptive geological terms and measurable field parameters such as joint spacing and joint roughness. It adds quantitative means to facilitate use of the system, especially by inexperienced engineers. The GSI system is applied to characterize the jointed rock masses at two underground powerhouse cavern sites in Japan.
Estimation of rock mass deformation modulus and strength of jointed hard rock masses using GSI system
Schätzung des Gesteinsverformungsmoduls und der Festigkeit von geklüfteten Gesteinen unter Verwendung des GSI-Systems
Cai, M. (author) / Kaiser, P.K. (author) / Uno, H. (author) / Tasaka, Y. (author) / Minami, M. (author)
2004
17 Seiten, 16 Bilder, 7 Tabellen, 34 Quellen
Article (Journal)
English
Felsbau , Fels , Felsmechanik , Geologie , Stein , Festigkeit , Verformung , Modul (Materialkonstante) , Gestein , Klassifizierung
Estimation of strength and deformation parameters of jointed rock masses
| British Library Conference Proceedings | 2007
Deformation Modulus of Jointed Rock Masses in Three-Dimensional Space
| British Library Conference Proceedings | 2000
Strength of massive to moderately jointed hard rock masses
| DataCite | 2019
A Method for Graphically Presenting the Deformation Modulus of Jointed Rock Masses
| British Library Online Contents | 2001