Open AccessMechanical behavior investigation of Longmaxi shale under high temperature and high confining pressure
Author(s) -
Huijun Lu,
Dongfeng Hu,
Ru Zhang,
Cun-Bao Li,
Jun Wang,
Li Ren
Publication year - 2019
Publication title -
thermal science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.339
H-Index - 43
eISSN - 2334-7163
pISSN - 0354-9836
DOI - 10.2298/tsci180823219l
Subject(s) - bedding , overburden pressure , materials science , bed , brittleness , oil shale , shear (geology) , ultimate tensile strength , composite material , fracture (geology) , compression (physics) , geology , geotechnical engineering , anisotropy , paleontology , physics , biology , quantum mechanics , horticulture
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.
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