Mechanical behavior investigation of Longmaxi shale under high temperature and high confining pressure

Thermal Science

Wang Jun¹  Li Cun-Bao¹  Ren Li¹  Hu Dong-Feng²  Lu Hui-Jun³  Zhang Ru⁴ 

[1] Key Laboratory of Deep Earth Science and Engineering (Sichuan University), Ministry of Education, Chengdu, China;Sinopec Exploration Company, China;State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, China + College of Water Resource & Hydropower, Sichuan University, Chengdu , China;State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, China + Key Laboratory of Deep Earth Science and Engineering (Sichuan University), Ministry of Education, Chengdu, China;

关键词: high temperature;    high confining pressure;    shale;    brittleness;    failure;   

DOI  :  10.2298/TSCI180823219L

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown