Evolution of Contact State during Shear of Rough Rock Joints and Its Influence on Seepage Characteristics
Publication: International Journal of Geomechanics
Volume 22, Issue 12
Abstract
The seepage characteristics of fractured rock mass under compression and shear are one of the important factors affecting the stability of rock mass engineering. In order to understand the effect of shear action on the variation of joint surface aperture and reveal the mechanism of shear action on the seepage behavior of joint surface, in this paper, laboratory tests and numerical simulations were used to study the shear flow in the rough rock joints. Based on the results of shear tests in the laboratory, a numerical seepage model considering the contact mode of joints surface was established by introducing contact mode into the elastic deformation of rock, and the changing trend of the fluid flow characteristics in the shear process was studied. The results show that the numerical model can restore the stress distribution and contact region evolution, and the inhomogeneous distribution and evolution of the apertures are closely related to the distribution and evolution of the fluid flow velocity inside the fracture, with the area of higher flow velocity showing a distribution trend perpendicular to the flow direction. This model can be used to predict the effect of shear on rock seepage in underground projects with fracture surfaces under complex stress conditions, and it is a guide for the study of shear-flow models with rough connection surfaces.
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Acknowledgments
This study has been partially funded by the Natural Science Foundation of China (Grant Nos. 52079062, 52004127, 52179102, and 51969015). The support is gratefully acknowledged.
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© 2022 American Society of Civil Engineers.
History
Received: Jan 24, 2022
Accepted: Jun 4, 2022
Published online: Sep 22, 2022
Published in print: Dec 1, 2022
Discussion open until: Feb 22, 2023
ASCE Technical Topics:
- Engineering fundamentals
- Flow (fluid dynamics)
- Fluid dynamics
- Fluid flow
- Fluid mechanics
- Geology
- Geomechanics
- Geotechnical engineering
- Hydrologic engineering
- Laboratory tests
- Models (by type)
- Numerical models
- Rocks
- Seepage
- Shear flow
- Shear tests
- Soil mechanics
- Soil properties
- Stress (by type)
- Stress distribution
- Structural analysis
- Structural engineering
- Tests (by type)
- Velocity distribution
- Water and water resources
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