Effect of long-term bedrock damage on the stability of deep underground excavations Abstract Mine workers are exposed to the risk of falling earth resulting from the instability of rock masses around mining excavations. Since classical analyses have simplifications that limit their validity, the authors want to evaluate a progressive damage model for cases of excavations into hard rock subjected to large stresses. The model studied, more representative of the actual behavior of rocks and rock masses, takes into account time and scale effects on the strength of materials. This more realistic method of analysis is a safer forecasting model, allowing a better evaluation of the support requirements, and therefore a better design of the underground mine excavations. The report includes examples of the application of the model in the laboratory and in an actual situation. Produced Under this Project Scientific Reports Effect of damage on the stability of underground excavation into hard rock Research Report: R-312 Scientific Publications Evaluating the large scale strength of rock mass with the MSDPu criterionAubertin M., Li L., Simon R.Source : in Proceedings of the 38th US Rock Mechanics Symposium (38th : 2001, Washington D.C.). Elsworth, D.; Tinucci, J.P.; Heasley, K.A. [dir.]. Rotterdam, A.A. Balkema, 2001, p. 1209-1216Stability analyses of underground openings using a multiaxial failure criterion with scale effectsLi L., Aubertin M., Simon R.Source : In Frontiers of Rock Mechanics and Sustainable Development in The 21st Century : ISRM International Symposium/2nd Asian Rock Mechanics Symposium (2nd : September 11-14, 2001 : Beijing, China). Sijing, W.; Bingjun, F.; Zhongkui, L. [dir.]. Rotterdam, A.A. Balkema, 2001, p. 251-256A multiaxial stress criterion for short- and long-term strength of isotropic rock mediaAubertin M., Li L., Simon R.Source : International Journal of Rock Mechanics and Mining Sciences, vol. 37, no 8, 2000, p. 1169-1193Analyses de la stabilité d'un tunnel non supporté avec un nouveau critère de rupture multiaxialLi L., Aubertin M., Simon R.Source : Canadian Tunnelling Journal, vol. 2000, 2000, p. 119-130Formulation and application of a short-term strength criterion for isotropic rocksAubertin M., Li L., Simon R., Khalfi S.Source : Canadian Geotechnical Journal; vol. 36, no 5, 1999, p. 947-960A unified representation of the damage and failure criteria for rocks and rock massesAubertin M., Li L., Simon R., Khalfi S. E.Source : in Proceedings of the 9th International Congress on Rock Mechanics (9th : September, 1999 :Paris, France). Vouille, G.; Berest, J. [dir.]. Rotterdam, A.A. Balkema, 1999, p. 843-848Multiaxial failure criterion with time and size effects for intact rockLi L., Aubertin M., Simon R.Source : in Proceedings of the 37th US Rock Mechanics Symposium (37th : June 6-9, 1999 : Vail, Colorado). Amadei, B.; Kranz, R.L.; Scott, G.A.; Smeallie, P.H. [dir.], Rotterdam, A.A. Balkema, 1999, p. 653-659Keynote Lecture: The semi-brittle behavior of low porosity rocksAubertin M., Julien M. R., Li L.Source : in Rock Mechanics in Mining, Petroleum and Civil Works: Proceedings of the 3rd North American Rock Mechanics Symposium (3rd, June 3-5 : 1998 : Cancun, Mexico), 1998, vol. 2, p. 65-90 Additional Information Type: Project Number: 0098-0040 Status: Completed Year of completion: 2002 Research Field: Mechanical and Physical Risk Prevention Team: Michel Aubertin (Polytechnique Montréal)Luc Vandamme (Centre de technologie Noranda)Denis Labrie (Centre canadien de la technologie des minéraux et de l'énergie)