Experimentation study of the temperature-pressure effect on original gas transport in granite sample
In order to investigate the gas transport behavior due to the rupture of rock, the granite sample from Creighton mine,Canada,was subjected to the temperature-pressure effects using the rock mechanics testing machine and a high resolution monitoring device. Its loading path is followed the characteristic for stress state changes in surrounding rock due to the deep mining. It is shown that some gas stored in cleat and pore was released with the increasing temperature. When the granite sample was splitting under the combination of temperature and pressure,the intensive acoustic emission was presented. The instantaneous occurrence of crack provided the gaseous reservoir to free gas,resulting in a gas pressure gradient between fracture and the environment due to gas pressure decrease. This change can be able to drive the gas back to the emerging crack. When the fracture network is filled with backflow gas,gas pressure rose back quickly. Some gas is released,such as CO2,CH4 and H2S. The confining pressure was applied on the deformed sample for squeezing the fracture from which large mounts of gas was ejected. The feature for the gas emission determined by the rupture of rock sample is discussed and analyzed.
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