THERMAL SCIENCE

International Scientific Journal

Hui-Jun Lu

,

Dong-Feng Hu

,

Ru Zhang

,

Cun-Bao Li

,

Jun Wang

,

Li Ren

MECHANICAL BEHAVIOR INVESTIGATION OF LONGMAXI SHALE UNDER HIGH TEMPERATURE AND HIGH CONFINING PRESSURE

ABSTRACT
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.
KEYWORDS
high temperature, high confining pressure, shale, brittleness, failure
PAPER SUBMITTED: 2018-08-23
PAPER REVISED: 2018-11-21
PAPER ACCEPTED: 2019-02-27
PUBLISHED ONLINE: 2019-05-26
DOI REFERENCE: https://doi.org/10.2298/TSCI180823219L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Issue 3, PAGES [1521 - 1527]
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Mechanical behavior investigation of Longmaxi shale under high temperature and high confining pressure

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