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- W2088910059 abstract "Uncertainty plays a critical role in geotechnical design projects. In addition to the natural variability of geomaterials, testing, transformation and modelling errors must also be considered to accurately characterize rockmass behaviour. By using statistical methods to quantify the intact rock strength and a measure of rockmass quality, a greater understanding of the variability in ground response and support performance can be achieved. This paper examines the issue of quantifying uncertainty in rockmass strength by using the generalized Hoek–Brown approach, which defines rockmass strength according to the intact strength envelope (based on test data) and the geological strength index (GSI). While uncertainty in GSI can be quantified through either a qualitative or quantitative approach, it is more difficult to assess the uncertainty in the intact strength envelope as it is defined by two correlated variables: the uniaxial compressive strength (UCS) and the Hoek–Brown material constant. A new set of linear and nonlinear regression approaches is proposed that can be used to accurately determine the mean intact strength envelope and quantify uncertainty from test data. A reliability-based design method is then presented that quantifies and utilizes uncertainty information at each stage of design to obtain a more complete understanding of rockmass behaviour. To demonstrate the usefulness of this approach, a reliability assessment is performed for a circular excavation under hydrostatic loading conditions." @default.
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- W2088910059 date "2015-02-01" @default.
- W2088910059 modified "2023-10-13" @default.
- W2088910059 title "Quantifying uncertainty in Hoek–Brown intact strength envelopes" @default.
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- W2088910059 doi "https://doi.org/10.1016/j.ijrmms.2014.12.008" @default.
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