TY - JOUR
TI - Mechanical behavior investigation of Longmaxi shale under high temperature and high confining pressure
AU - Lu Hui-Jun
AU - Hu Dong-Feng
AU - Zhang Ru
AU - Li Cun-Bao
AU - Wang Jun
AU - Ren Li
JN - Thermal Science
PY - 2019
VL - 23
IS - 3
SP - 1521
EP - 1527
PT - Article
AB - Triaxial compression tests are conducted on Longmaxi shale under high temperature and high confining pressure condition corresponding to a depth of 3000 m for two typical bedding plane orientations (0° and 90°). It is found that the crack initiation stresses and crack damage stresses of the Longmaxi shale specimens with different vein orientations are different, reflecting that the inclination of the bedding plane has a non-negligible influence on the microcrack initiation and propagation. In addition, the brittleness index of the Longmaxi shale with a bedding plane orientation of 90° is greater than that with an orientation of 0°, which confirmed that the brittleness index is related to the structural orientation under a high temperature and high confining pressure condition. Concerning the failure patterns, both the shear and tensile fracture modes has been observed.