|Document ID (ISN)||100751|
|Convention or series no.
||Etudes et recherches R-312
||Aubertin M., Li L., Simon R.
||Effect of damage on the stability of underground hard rock excavations
||Effet de l'endommagement sur la stabilité des excavations souterraines en roche dure [in French]|
||Institut de recherche en santé et en sécurité du travail du Québec (IRSST), 505 boul. de Maisonneuve Ouest, Montreal (Quebec) H3A 3C2, Canada, Sep. 2002. [1 vol.] Illus. 80 ref. An electronic version of the report in PDF format is also included on a CD-ROM.
||http://www.irsst.qc.ca/htmfr/pdf_txt/R-312.pdf [in French]
||The mechanical behaviour of rocks and rock masses around underground openings depends on many factors. For hard rocks, the onset of crack propagation, which can eventually lead to stress-induced failure, is a fundamental property called the damage initiation threshold. This threshold and the short term failure strength of rocks are represented using a multiaxial criterion in stress space. This criterion, named MSDPu, which has been extended to rock mass, allows the introduction of key factors that influence opening stability, namely small scale intact rock strength. Once all the components are properly defined, the MSDPu criterion is applied to various situations corresponding to actual conditions. In the applications described in this report, the approach is first used to analyse the stability of boreholes under idealized (laboratory) conditions, followed by the stability of large underground openings (with well documented information). Finally, the method is applied to a mine to evaluate its applicability and its limitations.
||stability; mining industry; underground work; drilling and boring (rock, earth)
||strength of materials; gallery tests; material failure; materials testing; crack detection; description of technique; material damage
||E - Books, reports, proceedings
|Country / State or Province||Canada|
||Mines and quarries
|Broad subject area(s)
||Mechanical hazards, transport
||Mining and quarrying