Journal Published Online: 01 December 1987
Volume 10, Issue 4

Triaxial Testing of Brittle Sandstone Using a Multiple Failure State Method



The first phase of a recent research program undertaken to investigate sandstone/methane outbursts in coal bearing rocks required the use of a sandstone reference material in the development and trial of the testing procedures to be used. This was because the number of specimens of outburst-prone rocks from the affected mine was limited. Thus another goal of the first phase was to determine a triaxial testing method for characterizing rock properties that minimized the number of specimens required. The International Society for Rock Mechanics (ISRM) multiple failure state method is attractive in this regard because an approximate strength envelope can be determined from a single specimen.

In this test program however the brittle nature of the reference material made control of failure by monitoring axial strain (the ISRM method) impossible; specimens always failed at the first, low or zero confinement, stage. An alternative method of detecting imminent failure in the specimen was developed and applied, yielding results almost identical to those obtained by conventional single state testing.

Author Information

Cain, P
Cape Breton Coal Research Laboratory, CRL, CANMET, Energy, Mines and Resources Canada, Sydney, Nova Scotia, Canada
Yuen, CMK
Golder Associates, Mississauga, Ontario, Canada
Le Bel, GR
Golder Associates, Mississauga, Ontario, Canada
Crawford, AM
University of Toronto, Ontario, Canada
Lau, DHC
University of Toronto, Ontario, Canada
Pages: 5
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Stock #: GTJ10547J
ISSN: 0149-6115
DOI: 10.1520/GTJ10547J