Research on the Mechanism of Evolution of Mechanical Anisotropy during the Progressive Failure of Oil Shale under Real-Time High-Temperature Conditions

Shaoqiang Yang (), Qinglun Zhang, Dong Yang and Lei Wang
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Shaoqiang Yang: College of Engineering for Safety and Emergency Management, Taiyuan University of Science and Technology, Taiyuan 030024, China
Qinglun Zhang: College of Engineering for Safety and Emergency Management, Taiyuan University of Science and Technology, Taiyuan 030024, China
Dong Yang: Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
Lei Wang: Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China

Energies, 2024, vol. 17, issue 16, 1-19

Abstract: Real-time high-temperature CT scanning and a rock-mechanics test system were employed to investigate the mechanical properties of oil shale at temperatures from 20 to 600 °C. The results reveal that up to 400 °C, the aperture of fractures initially decreases and then increases when loading is perpendicular to the bedding. However, the number and aperture continuously increase when loading is parallel to the bedding. Beyond 400 °C, the number of pores increases and the aperture of the fractures becomes larger with rising temperature. The changes in microstructures significantly impact the mechanical properties. Between 20 and 600 °C, the compressive strength, elastic modulus, and Poisson’s ratio initially decrease and then increase under perpendicular and parallel bedding loadings. The compressive strength and elastic modulus reach minimum values at 400 °C. However, for Poisson’s ratio, the minimum occurs at 500 °C and 200 °C under perpendicular and parallel bedding loadings, respectively. Simultaneously, while the crack damage stress during perpendicular bedding loading, σ cd-per , initially exhibits an upward trend followed by a decline and subsequently increases again with temperature increasing, the initial stress during perpendicular bedding loading, σ ci-per , parallel bedding loading, σ ci-par, and damage stress, σ cd-par , decrease initially and then increase, reaching minimum values at 400 °C. These research findings provide essential data for reservoir reconstruction and cementing technology in the in situ mining of oil shale.

Keywords: real-time high temperature; oil shale; uniaxial compression; fracture propagation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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