Using geotechnical scenarios for underground structure analysis: A case study in a hydroelectric complex in northern Portugal

3D geological models Science & Technology Engenharia e Tecnologia::Engenharia Civil Mechanical behaviour analysis Geological heterogeneity Geotechnical modelling Uncertainty assessment Indústria, inovação e infraestruturas 01 natural sciences 0105 earth and related environmental sciences
DOI: 10.1016/j.tust.2021.103855 Publication Date: 2021-02-21T10:01:45Z
ABSTRACT
Abstract This paper presents a methodology to map the uncertainty associated with geomechanical parameters in heterogeneous rock masses, their spatial variability and the heterogeneities existing at different spatial scales. The methodology combines geostatistical simulation to produce numerous realisations of the parameters of interest, a scenario reduction technique to reduce the number of realisations with losing as little information as possible, and the numerical analysis of the selected realisations using a finite differences software. It is applied to a hydraulic underground structure built in northern Portugal and validated using a 3D numerical model. Compared with a deterministic model, the results in terms of displacements and principal stresses confirm the potential of this innovative characterisation methodology in decreasing the uncertainty linked to their characterisation and in performing a more accurate analysis of underground works.
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