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
Afiliação do autor:	Universidade de Brasília, Faculdade de Tecnologia, Engineering, Avenue Professor Mário Werneck, 60, Belo Horizonte, MG, Bucknell University, DF+ Engineering, Avenue Professor Mário Werneck, 60, Belo Horizonte, MG, Brazil Universidade de Brasília, Faculdade de Tecnologia Bucknell University, 1 Dent Drive, Lewisburg, PA 17837, USA Universidade de Brasília, Faculdade de Tecnologia Universidade de Brasília, Faculdade de Tecnologia
Data de publicação:	2024
Editora:	Elsevier
Referência:	KOMODROMOS, Michail et al. Implementation of linear strain elements for image-based Finite Element Analysis of cemented natural sand. Computers and Geotechnics, [s. l.], v. 174, p. 106606, out. 2024. DOI: https://doi.org/10.1016/j.compgeo.2024.106606. Disponível em: https://www.sciencedirect.com/science/article/pii/S0266352X24006062. Acesso em: 23 maio 2024.
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
DOI:	https://doi.org/10.1016/j.compgeo.2024.106667
Fonte:	Computers and Geotechnics
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