Bibliographic Details
| Title: |
Investigation of the anisotropic mechanical response of layered shales |
| Authors: |
Min Gao, Bin Gong, Zhengzhao Liang, Shanpo Jia, Jiuqun Zou |
| Source: |
Energy Science & Engineering, Vol 11, Iss 12, Pp 4737-4754 (2023) |
| Publisher Information: |
Wiley, 2023. |
| Publication Year: |
2023 |
| Collection: |
LCC:Technology
LCC:Science |
| Subject Terms: |
anisotropy, failure criterion, layered shales, shale gas development, triaxial compression, Technology, Science |
| More Details: |
Abstract Layered shales exist widely and are often encountered during shale gas development. However, the mechanical response of layered shales is significantly affected by the existence of beddings, resulting in the obvious anisotropy characteristics regarding deformation, strength and failure mode. To clarify the underlying mechanisms of shale anisotropy that control the safety of engineering projects, the numerical simulation and theoretical analysis were conducted. The results show that with the growth of confining pressure, the compressive resistance of shales gradually increases, the shear fractures govern the instability and the anisotropy index decreases. Furthermore, several strength criteria for layered rock masses were summarized, and the modified Jaeger strength criterion was proposed by introducing the anisotropic parameter Rcθ. It can effectively reflect the failure modes and strength features of layered shales under triaxial conditions with a higher accuracy. Besides, the variation of cohesion and internal friction angle of layered shale samples was comprehensively analysed under the triaxial conditions. Clearly, as the inclination angle of bedding planes increases, the cohesion of layered shales first decreases, but then increases under triaxial compression, showing the ‘U’‐shaped changing trend. Additionally, the internal friction angle of layered shales gradually increases with the increase in the inclination of bedding planes. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
2050-0505 |
| Relation: |
https://doaj.org/toc/2050-0505 |
| DOI: |
10.1002/ese3.1611 |
| Access URL: |
https://doaj.org/article/00542192571f45879fb4a801d08c5272 |
| Accession Number: |
edsdoj.00542192571f45879fb4a801d08c5272 |
| Database: |
Directory of Open Access Journals |
