|
Abstract Testing system MTS 815 is used to carry out triaxial compression tests for specimens from Barnett，Haynesville，Eagle Ford in North American，and Longmaxi shale in South China. Their failure modes and mechanical behaviors under different confining pressures are obtained correspondingly. The similarities and differences between them are analyzed in detail. Splitting failure and splitting-shear mixed failure modes are the main failure modes for shale samples under low confining pressures，while shear failure modes predominate under higher pressures. The types of shale，burial depth，coring direction and confining pressures are all factors affecting the mechanical behavior of specimens. More quartz and carbonate contained specimen tends to be more brittle. In addition，the peak strength and Young?s modulus of shale are proportional with confining pressure，especially when the confining pressure is higher than 30 MPa. The peak strength of Barnett shale is higher than Haynesville，but lower than Eagle Ford. Shale samples from South China，compared with that from North America，have higher strength and Young?s modulus，while lower Poisson?s ratio. The brittleness characteristics of shale samples from China is similar to that from America.
|
|
Received: 25 November 2011
|
|
|
|
2012, Vol. 31 
