Modelling the Sensitivity of Underground Space Stability to the In Situ Stress Uncertainties: Case Study at the Bukov Underground Research Facility Phase II (Rožná Mine, Czechia)

0546770 - ÚGN 2022 RIV CZ eng J - Journal Article
Gong, Libin - Souček, Kamil - Waclawik, Petr - Vavro, Martin - Staš, Lubomír - Němčík, J. - Ram, S.
Modelling the Sensitivity of Underground Space Stability to the In Situ Stress Uncertainties: Case Study at the Bukov Underground Research Facility Phase II (Rožná Mine, Czechia).
Acta geodynamica et geomaterialia. Roč. 18, č. 3 (2021), s. 319-334. ISSN 1214-9705. E-ISSN 2336-4351
Institutional support: RVO:68145535
Keywords : numerical modeling * in situ stress * strength-stress ratio * roadway convergence * stability model
OECD category: Mining and mineral processing
Impact factor: 1.000, year: 2021
Method of publishing: Open access
https://www.irsm.cas.cz/index_en.php?page=acta_detail_doi&id=403

Numerical modelling has been widely used in the underground excavation design, where the in situ stress state plays a crucial role in the stability analysis. However, determination of an exact
stress state for a specific geological region remains uncertain due to the complicated tectonic nature and measurement limitations. The stability is thus better analysed by considering the in situ
stress as a finite spectrum and pinpointing the possible worst-case scenario. The most probable scenarios of in situ stress states in the Rožná mine area were analysed based on the varying trends
in principal stress ratio and mean stress values obtained from four different measurement/analysis campaigns. The influence of different in situ stress judgement on the deformation and failure
characteristics of the Bukov Underground Research Facility (URF) (Phase II, Czech) were investigated by the finite volume program FLAC3D. Results show that the increased horizontal
stress anisotropy and the mean stress level jointly increase the overall deformation and lower the URF stability. Such influences on the roadway horizontal convergence are more considerable than
the vertical ones. A mathematical model considering mean stress and horizontal stress ratio was proposed to quantitatively describe the overall stability, especially useful for excavations possessing complicated configuration.

Permanent Link: http://hdl.handle.net/11104/0323161