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Gao X.,Heilongjiang University | Gao X.,National Professional Center Laboratory of Safety Basic Research for Hydrocarbon Gas Pipeline Transportation Network | Liu W.-X.,National Professional Center Laboratory of Safety Basic Research for Hydrocarbon Gas Pipeline Transportation Network | Liu W.-X.,Heilongjiang University | And 7 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2015

The accurate mechanical property measurements of gas hydrate-bearing coal are primarily important for coal and gas outburst prevention based on hydrate method. Authors investigated the bulk strength of the specimens at different levels of methane hydrate saturation, using a self-developed integrated gas hydrate formation and triaxial compression apparatus. The results show that the stress-strain curves exhibit strain softening under confining pressure 1 and 2 MPa while exhibiting strain hardening under 3 MPa. The results also show that confining pressure has significant impact on the failure strength. The failure strength linearly increases with the increase of saturation, with little fluctuation. The friction angle and cohesion are weakly dependent on saturation. Comparing with those of gas-bearing coal, the methane hydrate formation increases failure strength, deformation modulus and internal angle, with no obvious cohesion variation. © 2015, China Coal Society. All right reserved.

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