Título:	The impact of discontinuities on spalling failure in excavations under high-stress conditions
Autor(es):	Soares, Erick Rógenes Simão Gomes, Alessandra dos Santos Farias, Márcio Muniz de Fávero Neto, Alomir Hélio Freire, Germán Marcelo Martins Vinueza Rasmussen, Leandro Lima
ORCID:	https://orcid.org/0000-0001-7272-2721 https://orcid.org/0000-0002-1202-2958
Afiliação do autor:	University of Brasília, Faculty of Tecnology DF+ Engineering, Avenue Professor Mário Werneck, 60, Belo Horizonte, MG, Brazil Bucknell University, 1 Dent Drive, Lewisburg, PA 17837, USA DF+ Engineering, Avenue Professor Mário Werneck, 60, Belo Horizonte, MG, Brazil University of Brasília, Faculty of Tecnology Bucknell University, 1 Dent Drive, Lewisburg, PA 17837, USA University of Brasília, Faculty of Tecnology University of Brasília, Faculty of Tecnology
Assunto:	Escavações subterrâneas Modelo continuo de blocos Voronoi Rede de fraturas discretas
Data de publicação:	2024
Editora:	Elsevier
Referência:	RÓGENES, Erick et al. The impact of discontinuities on spalling failure in excavations under high-stress conditions. Computers and Geotechnics, [S. l.], v. 175, 106607, nov. 2024. DOI: https://https://doi.org/10.1016/j.compgeo.2024.106667. Disponível em: https://www.sciencedirect.com/science/article/pii/S0266352X24006062?via%3Dihub. Acesso em: 7 maio 2026.
Abstract:	The Continuum Voronoi Block Model (CVBM), a pseudo-discontinuum modeling technique based on the Finite Element Method, was employed to investigate the impact of discontinuities on spalling phenomena around excavations in rocks under high-stress conditions. The CVBM’s ability to produce numerical results consistent with spalling was demonstrated through a case study of the Mine-by tunnel. The results show that the model can explicitly capture the formation of macro-fractures parallel to excavation walls, intact rock slabs, and V-shaped notches. The results of this case study support the application of CVBM for parametric analyses to investigate the role of discontinuities in spalling failure, integrating discrete fracture network (DFN) into the model. The influence of DFN parameters such as dip angle, spacing, persistence, position, and mechanical properties is also evaluated. It was found that discontinuities promote stress relief due to shear, thereby altering spalling damage around the excavation in highly stressed rock. This finding highlights the crucial role of discontinuities in influencing the behavior of excavations under such conditions.
Unidade Acadêmica:	Faculdade de Tecnologia (FT) Departamento de Engenharia Civil e Ambiental (FT ENC)
DOI:	https://doi.org/10.1016/j.compgeo.2024.106667
Versão da editora:	https://www.sciencedirect.com/science/article/pii/S0266352X24006062?via%3Dihub
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