Mechanical Characteristics of Similar Weakly Cemented Soft Rock under Directional Shear Stress Path and Modified Lade–Duncan Criterion
Publication: International Journal of Geomechanics
Volume 24, Issue 11
Abstract
To avoid engineering challenges during roadway excavation or workface mining in weakly cemented soft rock, the characteristics of this rock under the influence of associated stress paths must be explored. Therefore, this study investigates the principal strain and generalized shear strain of weakly cemented soft rock under a directional shear stress path, through a series of principal-stress directional shear tests conducted using a hollow cylinder apparatus. The damage morphology characteristics for different major principal-stress directions are also discussed. The results show that the major principal strain (ɛ1) gradually increased with increasing major principal-stress direction angle (α), when α ranges from 0° to 45°, whereas the minor principal strain (ɛ3) and intermediate principal strain (ɛ2) gradually decreased. The peak stress of the soft rock gradually decreased and a main slip-damage crack developed in the major principal-stress direction. The peak generalized shear strain increased slowly in the first compression–torsion stage and rapidly in the second. As α ranges from 45° to 90°, ɛ1 and ɛ2 decreased gradually whereas ɛ3 increased gradually. The peak stress also increased slowly, with the main crack developing in the minor principal-stress direction. Additionally, the peak generalized shear strain rapidly decreased in the first tension–torsion stage and then slowly decreased in the second. The principal-stress rotation space transformation matrix was introduced to modify the Lade–Duncan (L-D) criterion, and the criterion reliability was verified using the peak value of the soft rock deviatoric stress under different principal-stress directions. The modified L-D criterion considered the effects of both the principal-stress magnitude and direction. The results are of great significance for studying the influence of principal-stress direction and provide an important method to investigate the mechanical properties of rocks with complex stress paths comprehensively.
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Data Availability Statement
All data, models, and codes generated or used during the study appear in the published article.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant Nos. 52104088 and 52374091), the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering (No. SKLGME022021), and the China Postdoctoral Science Foundation (Grant No. 2022M713383). The authors gratefully acknowledge the helpful comments made by the reviewers.
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Information & Authors
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Published In
International Journal of Geomechanics
Volume 24 • Issue 11 • November 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: May 21, 2024
Accepted: Jun 3, 2024
Published online: Sep 12, 2024
Published in print: Nov 1, 2024
Discussion open until: Feb 12, 2025
ASCE Technical Topics:
- Cement
- Concrete
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Geology
- Geomechanics
- Geotechnical engineering
- Laboratory tests
- Material mechanics
- Material properties
- Materials engineering
- Mechanical properties
- Rock mechanics
- Rocks
- Shear stress
- Shear tests
- Strain
- Stress (by type)
- Structural analysis
- Structural engineering
- Tests (by type)
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