Characteristics of Gas Transport within Uniaxial Compression of Granite Sample

Abstract:

The physical processes triggering the fluid flow within the stressed rock are highly complex and not fully understood. The granite sample obtained from Creighton mine, Canada, was subjected to the temperature-pressure effects using a special rock mechanic testing machine equipped with a high precision gas monitor. It is shown that when the sample approached to the peak stress during the uniaxial compression test, the connective cracks instantaneously occurred accompanied by a swarm of AE activities, which suddenly decrease the fluid pore pressure. This change can be able to drive the gas back to the newly emerging crack due to the formation of gas pressure gradient within the damage zones. It is indicated that the different permeabilities among the zones can dominate the suction-exhaust proceeding of pore fluids within rock mass. Beyond the volumetric strain at null, the deformation of the stressed rock leads to a reversely change in pore pressure of closed pores. The feature for the gas emission determined by the changes in pore structure of rock is also discussed and analyzed.

• Periodical: Advanced Materials Research (Volumes 594-597)
• Pages: 2136-2141
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.594-597.2136
• Online since: November 2012
• Authors: Chun Guang Wang, Chaojun Li, Xueqiang Hu, Bingqian Li
• Keywords: AE Activity, Gas Transport, Granite, Uniaxial Compression, Volumetric Strain

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