A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Permeability Evolution of Argillaceous Sandstone Subjected to Hydromechanical Loading
https://orcid.org/http://orcid.org/0000-0001-8609-608X
Understanding the permeability properties and mechanical behavior of rock under coupled hydromechanical loading is crucial for deep-underground engineering applications. In this study, a set of triaxial compression-permeability tests under various confining pressures (pc) and pore pressures (pw) were carried out to understand the mechanical properties and permeability evolution of argillaceous sandstone. The experimental results show that the deformation and permeability evolution can be divided into different stages by stress thresholds, including crack-closure stress, crack-initiation stress, and peak strength. With the increase of pc, the stress thresholds increase, and the rock permeability decreases, whereas pw exhibits the opposite influence. The strain sensitivity of permeability when pc=10MPa is greater than that when pc=30MPa, which can be attributed to the initial rock compaction. The permeability first declines exponentially with the increase of the external load before it recovers. Compared to the permeability recovery when pc=10MPa, the permeability recovery when pc=30MPa is much less obvious, which may be attributed to the pore collapse within the rock under high confining pressure. We proposed a damage-based permeability model to fit the experimental results. This model considers the interaction of the matrix, fractures within the matrix, and fractures between the matrix. This study shed light on the rock permeability evolution under coupled hydromechanical loading.
The confining pressure increases the stress threshold and decreases the permeability of sandstone.
The pore pressure has the opposite effect on the stress threshold and permeability.
A permeability model considering the damage within matrix is proposed.
The permeability evolution curve changes from U-shaped to L-shaped as the confining pressure increases.
Permeability Evolution of Argillaceous Sandstone Subjected to Hydromechanical Loading
https://orcid.org/http://orcid.org/0000-0001-8609-608X
Understanding the permeability properties and mechanical behavior of rock under coupled hydromechanical loading is crucial for deep-underground engineering applications. In this study, a set of triaxial compression-permeability tests under various confining pressures (pc) and pore pressures (pw) were carried out to understand the mechanical properties and permeability evolution of argillaceous sandstone. The experimental results show that the deformation and permeability evolution can be divided into different stages by stress thresholds, including crack-closure stress, crack-initiation stress, and peak strength. With the increase of pc, the stress thresholds increase, and the rock permeability decreases, whereas pw exhibits the opposite influence. The strain sensitivity of permeability when pc=10MPa is greater than that when pc=30MPa, which can be attributed to the initial rock compaction. The permeability first declines exponentially with the increase of the external load before it recovers. Compared to the permeability recovery when pc=10MPa, the permeability recovery when pc=30MPa is much less obvious, which may be attributed to the pore collapse within the rock under high confining pressure. We proposed a damage-based permeability model to fit the experimental results. This model considers the interaction of the matrix, fractures within the matrix, and fractures between the matrix. This study shed light on the rock permeability evolution under coupled hydromechanical loading.
The confining pressure increases the stress threshold and decreases the permeability of sandstone.
The pore pressure has the opposite effect on the stress threshold and permeability.
A permeability model considering the damage within matrix is proposed.
The permeability evolution curve changes from U-shaped to L-shaped as the confining pressure increases.
Permeability Evolution of Argillaceous Sandstone Subjected to Hydromechanical Loading
https://orcid.org/http://orcid.org/0000-0001-8609-608X
Understanding the permeability properties and mechanical behavior of rock under coupled hydromechanical loading is crucial for deep-underground engineering applications. In this study, a set of triaxial compression-permeability tests under various confining pressures (pc) and pore pressures (pw) were carried out to understand the mechanical properties and permeability evolution of argillaceous sandstone. The experimental results show that the deformation and permeability evolution can be divided into different stages by stress thresholds, including crack-closure stress, crack-initiation stress, and peak strength. With the increase of pc, the stress thresholds increase, and the rock permeability decreases, whereas pw exhibits the opposite influence. The strain sensitivity of permeability when pc=10MPa is greater than that when pc=30MPa, which can be attributed to the initial rock compaction. The permeability first declines exponentially with the increase of the external load before it recovers. Compared to the permeability recovery when pc=10MPa, the permeability recovery when pc=30MPa is much less obvious, which may be attributed to the pore collapse within the rock under high confining pressure. We proposed a damage-based permeability model to fit the experimental results. This model considers the interaction of the matrix, fractures within the matrix, and fractures between the matrix. This study shed light on the rock permeability evolution under coupled hydromechanical loading.
The confining pressure increases the stress threshold and decreases the permeability of sandstone.
The pore pressure has the opposite effect on the stress threshold and permeability.
A permeability model considering the damage within matrix is proposed.
The permeability evolution curve changes from U-shaped to L-shaped as the confining pressure increases.
Permeability Evolution of Argillaceous Sandstone Subjected to Hydromechanical Loading
Rock Mech Rock Eng
Xu, Ying (author) / Liu, Jiacun (author) / Xiao, Junjie (author) / Wu, Bangbiao (author) / Xia, Kaiwen (author)
Rock Mechanics and Rock Engineering ; 58 ; 1379-1393
2025-02-01
15 pages
Article (Journal)
Electronic Resource
English
Permeability Evolution of Argillaceous Sandstone Subjected to Hydromechanical Loading
| Springer Verlag | 2025