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      저자 : ( Vassilis Marinos ) (검색결과 1 건)
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      • Respecting the Engineering Geological Differentiations in Application of GSI in the Hoek-Brown Failure Criteria for Rock Engineering Design

        ( Vassilis Marinos ),( Trevor Carter ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2

        The necessity for reliable estimates of strength and deformation characteristics of the rockmasses on which or within which engineering structures are to be created, after the significant advances that have occurred in recent years in numerical modelling capability, is essential. The development of these tools has to be comparative with the improvement in geologic base data. GSI characterization, linked with Hoek-Brown strength determination as a basis for modelling has been widely adopted by engineers and geologists involved in rock engineering design. Back-analyses of tunnels, slopes and foundation behaviour using GSI and its reliable application in rock engineering designs attest to its reliability, however, greater understanding is needed in the definition of input constants, for establishing both GSI and intact rock properties. This need for improved evaluation, particularly from a geological perspective, is addressed. Geological processes of tectonism, weathering and alteration all affect GSI and are analysed based on real rockmass cases. Illustrations are given of how geological differentiation dictates variability in geotechnical properties of most common rocks. The need for geological definition of rockmass properties required as inputs into numerical analysis, constitutes one of the greatest reasons for application of the GSI chart, allowing characterization of even difficult-to-describe rockmasses. This chart allows selection of appropriate GSI ranges for any specific rock suite. Specific key engineering geological characteristics that differentiate igneous, metamorphic and sedimentary one from each other are highlighted through discussion of various example rock units (including gneisses, granites, ophiolites, limestones, schists, siltstones/mudstones/shales, and molassic and flysch formations).

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