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Numerical modelling on the stability of an underground research facility excavation in Czech Republic
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SYSNO ASEP 0548181 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Numerical modelling on the stability of an underground research facility excavation in Czech Republic Author(s) Gong, Libin (UGN-S)
Waclawik, Petr (UGN-S) RID
Souček, Kamil (UGN-S) RID, ORCID
Vavro, Martin (UGN-S) RID, ORCID
Němčík, J. (AU)
Ram, Sahendra (UGN-S)
Kukutsch, Radovan (UGN-S) RID, ORCIDNumber of authors 7 Source Title Proceedings of the 2021 Resource Operators Conference. - Toowoomba, Queensland : University of Southern Queensland, 2021 / Aziz N. ; Mirzaghorbanali A. - ISBN 978-1-74128-335-8 Pages s. 329-348 Number of pages 20 s. Publication form Online - E Action Resource Operators Conference 2021 Event date 10.02.2021 - 12.02.2021 VEvent location University of Southern Queensland Country AU - Australia Event type WRD Language eng - English Country AU - Australia Keywords numerical modelling ; underground research facility ; stress state Subject RIV DH - Mining, incl. Coal Mining OECD category Mining and mineral processing Institutional support UGN-S - RVO:68145535 Annotation A new Underground Research Facility (URF) is planned to be constructed in the Rožná Mine, Czech Republic. It is essential to evaluate the feasibility of the current excavation design before the start of the excavation. Numerical simulation using the software FLAC3D was adopted to investigate the stability or the strength-stress ratio of the URF. Laboratory tensile strength and uniaxial compressive strength tests on the rock specimens at various inclinations of the weak planes combined with the Geological Strength Index (GSI) system provide reliable deformation and strength input parameters for the explicit continuum model. The well-known modified Hoek-Brown constitutive model was employed for the numerical evaluation of the URF stability. In situ three-dimensional stress tensors were measured from the field and applied to the model boundaries. Displacement/convergence and distribution patterns of the stress state and strength-stress ratio were analysed. It was found that the current URF layout is on the safe side and the total displacement is minor and acceptable. Locations with potentially low strength-stress ratios were mainly around the roadway-chamber intersections. The current study can provide a valuable reference to similar numerical works since such large-scale numerical simulations are rare, due to the complexity and the time-consuming nature of the study. Workplace Institute of Geonics Contact Lucie Gurková, lucie.gurkova@ugn.cas.cz, Tel.: 596 979 354 Year of Publishing 2022 Electronic address https://ro.uow.edu.au/coal/823/
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