Journal Title
Title of Journal: Bull Eng Geol Environ
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Abbravation: Bulletin of Engineering Geology and the Environment
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Publisher
Springer-Verlag
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Authors: V Marinos P Marinos E Hoek
Publish Date: 2005/02/02
Volume: 64, Issue: 1, Pages: 55-65
Abstract
The geological strength index GSI is a system of rockmass characterization that has been developed in engineering rock mechanics to meet the need for reliable input data particularly those related to rockmass properties required as inputs into numerical analysis or closed form solutions for designing tunnels slopes or foundations in rocks The geological character of rock material together with the visual assessment of the mass it forms is used as a direct input to the selection of parameters relevant for the prediction of rockmass strength and deformability This approach enables a rock mass to be considered as a mechanical continuum without losing the influence geology has on its mechanical properties It also provides a field method for characterizing difficulttodescribe rock masses After a decade of application of the GSI and its variations in quantitative characterization of rock mass this paper attempts to answer questions that have been raised by the users about the appropriate selection of the index for a range of rock masses under various conditions Recommendations on the use of GSI are given and in addition cases where the GSI is not applicable are discussed More particularly a discussion and suggestions are presented on issues such as the size of the rock mass to be considered its anisotropy the influence of great depth the presence of ground water the aperture and the infilling of discontinuities and the properties of weathered rock masses and soft rocksLe Geological Strength Index GSI est un système de classification des massifs rocheux développé en mécanique des roches Il permet d’obtenir les données relatives aux propriétés de masses rocheuses données nécessaires pour des simulations numériques ou permettant le dimensionnement d’ouvragestunnels pentes ou fondations rocheuses Les caractéristiques géologiques de la matrice rocheuse ainsi que celles relatives à la structure du massif correspondant sont directement utilisées pour obtenir les paramètres appropriés relatifs à la déformabilité et la résistance de la masse rocheuse Cette approche permet de considérer une masse rocheuse comme un milieu continu le rôle des caractéristiques géologiques sur les propriétés mécaniques n’étant pas oblitèré Elle apporte aussi une méthode de terrain pour caractériser des masses rocheuses difficiles à décrire Après une décennie d’application du Geological Strength Index et de ses variantes pour caractériser des masses rocheuses cet article tente de répondre aux questions formulées par les utilisateurs concernant le choix le plus approprié de cet index pour une large gamme de massifs rocheux Des recommandations quant à l’usage du GSI sont données et de plus des cas où le GSI n’est pas applicable sont discutés Plus particulièrement des suggestions sont apportées sur des questions relatives à la taille de masse rocheuse à considérer son anisotropie l»influence des grandes profondeurs la présence d’eau l’ouverture et le remplissage des discontinuités ainsi que les propriétés des masses rocheuses altérées et des roches tendres
Keywords:
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Other Papers In This Journal:
- Discontinuity networks in mudstones: a geological approach
- Comparison of the geotechnical properties of crushed shales from Southeastern Nigeria
- GIS-based landslide susceptibility mapping with logistic regression, analytical hierarchy process, and combined fuzzy and support vector machine methods: a case study from Wolong Giant Panda Natural Reserve, China
- Interactions of overburden failure zones due to multiple-seam mining using longwall caving
- Comparison of undrained shear strength by pressuremeter and other tests, and numerical assessment of the effect of finite probe length in pressuremeter tests
- Predicting mechanical properties of mudrock from index parameters
- Assessment of the adhesion potential of kaolinite and montmorillonite using a pull-out test device
- The unique relationship between swell percent and swell pressure of compacted clays
- Influence of rock cradle block geometry on rebound hardness
- BHE logging and cement hydration heat analyses for the determination of thermo-physical parameters
- Landslide investigations in the northwest section of the lesser Khingan range in China using combined HDR and GPR methods
- Evaluation of surface settlements in the Istanbul metro in terms of analytical, numerical and direct measurements
- Vulnerability assessment for reinforced concrete buildings exposed to landslides
- “Plagioclase solution degree index”: a new index to evaluate the weathering degree of granite
- Evaluation of waste embankment slope stability: Valea Manastirii, Gorj, Romania
- Evaluation of subsurface spatial variability in site characterization based on RCPTU data
- Assessment of the earthquake potential of the west Aegean region of Turkey based on seismicity, tectonics, crustal deformation and geo-archaeological evidence and its geotechnical aspects
- The effect of frost weathering at the dinosaur tracksite in Seoyu-ri, Hwasun, Korea
- Stabilisation of old lignite pit dumps in Eastern Germany
- Significance of outward dipping strata in argillaceous limestones in the area of the Three Gorges reservoir, China
- Slope stability problems of the weak rocks in the Asarsuyu pass of the Anatolian motorway
- Landslide susceptibility zonation study using remote sensing and GIS technology in the Ken-Betwa River Link area, India
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