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Global sensitivity analysis of rockmass and support design parameters in tunnel-support system

Pandit, B and Babu, GLS (2020) Global sensitivity analysis of rockmass and support design parameters in tunnel-support system. In: 54th U.S. Rock Mechanics/Geomechanics Symposium, 28 June-1 July 2020, Virtual, Online.

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Official URL: https://link.springer.com/article/10.1007/s00603-0...


Reliability based design approaches are usually adopted to explicitly consider uncertainties in rockmass and make decisions on selection of design parameters for tunnel-support problems. However, it is difficult to accurately characterize the input random variables due to fewer sample availability and costly observations. Thus, it is necessary to efficiently allocate the resources towards the characterization and reduction of epistemic uncertainty of those input variables, which have higher relative contributions towards the variability in output. These input variables are identified using global sensitivity analysis based on Sobol indices conducted for the case of supported circular tunnel in Hoek-Brown rockmass. Convergent confinement analysis method is applied to obtain the output - radius of yield zone, tunnel convergence and induced load on installed support. Results indicate that relative contribution of variation in uniaxial compressive strength of rock is highest towards the variation in the outputs followed by geological strength index of rockmass, its deformation modulus and thickness of the liner support. © 2020 ARMA, American Rock Mechanics Association

Item Type: Conference Paper
Publication: 54th U.S. Rock Mechanics/Geomechanics Symposium
Publisher: American Rock Mechanics Association (ARMA)
Additional Information: The copyright of this article belongs to the American Rock Mechanics Association (ARMA).
Keywords: Compressive strength; Rock mechanics; Rocks; Tunnels; Uncertainty analysis, Epistemic uncertainties; Geological strength index; Global sensitivity analysis; Input random variables; Relative contribution; Reliability based design; Tunnel support problems; Uniaxial compressive strength, Sensitivity analysis
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 12 Jan 2021 06:37
Last Modified: 11 Dec 2022 04:55
URI: https://eprints.iisc.ac.in/id/eprint/67543

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