Improvement of analytical factor of safety estimation of falling failure mode in roof wedge stability

Autor(es): Napa-García, G. F.; Santos, R. A.; Beck, A.T.; Celestino, T.B.
Resumo: (EN) The stability of underground openings at low stress levels is usually controlled by structural features of the rock mass. Hence, the most common failure mode in shallow underground openings, in hard rock masses, is block fall. This type of failure can occur by translational, rotational or mixed modes.1 Much effort has been dedicated to the analytical solution of the problem of wedge stability in underground openings.2–7 Simplifications have been adopted in order to find analytical solutions, such as: planarity, infinite stiffness, limit equilibrium and persistency, among others. Goodman and Shi4 developed a rational topological-based method called Block Theory to identify potentially unsafe block configurations. The authors considered discontinuities as being planar-shaped entities, persistent over the analysis domain. The intact rock was considered to be rigid. This method serves to identify the kinematic feasibility of a rock block to slide. The original Block Theory considered only translational kinematics. Rotational kinematics was later introduced by Mauldon and Goodman.
Periódico: International Journal of Rock Mechanics and Mining Sciences
Ano: 2018
Volume: v. 103
Páginas: p. 116-122
DOI: https://doi.org/10.1016/j.ijrmms.2018.01.002
Ano de publicação: 2018
Disponível em: https://www.sciencedirect.com/science/article/pii/S1365160917302265?via%3Dihub
Editora com ISSN: Elsevier