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Characterization of the permeability evolution of hard and soft rocks under hydro‐mechanical coupling conditions
AbstractPrediction of permeability changes in surrounding rock induced by engineering disturbances is crucial for mitigating tunnel water inrush accidents. This study investigates the progressive failure characteristics and permeability evolution of hard and soft rocks subjected to triaxial compression. A series of laboratory tests were conducted at confining pressures ranging from 4 to 20 MPa. Experimental results demonstrate that rock permeability variation with strain shows three distinct stages: an initial decrease, a stage of rapid mutation, and a postpeak increase. The concept of critical permeability barrier strength is introduced, representing the stress level at which continuous fracture formation enables significant seepage. Furthermore, two generalized permeability–stress models are developed for soft and hard rocks. The predicted permeability values obtained from these models align well with the experimental data. These findings offer valuable insights into the hydro‐mechanical coupling behavior of rocks, providing a foundation for safe construction practices in underground engineering.
Highlights The permeability variation of rocks during complete stress–strain processes was investigated. A mathematical model describing the influence of rock damage on permeability was constructed. The permeability–stress relationship between soft rock and hard rock was proposed.
Characterization of the permeability evolution of hard and soft rocks under hydro‐mechanical coupling conditions
AbstractPrediction of permeability changes in surrounding rock induced by engineering disturbances is crucial for mitigating tunnel water inrush accidents. This study investigates the progressive failure characteristics and permeability evolution of hard and soft rocks subjected to triaxial compression. A series of laboratory tests were conducted at confining pressures ranging from 4 to 20 MPa. Experimental results demonstrate that rock permeability variation with strain shows three distinct stages: an initial decrease, a stage of rapid mutation, and a postpeak increase. The concept of critical permeability barrier strength is introduced, representing the stress level at which continuous fracture formation enables significant seepage. Furthermore, two generalized permeability–stress models are developed for soft and hard rocks. The predicted permeability values obtained from these models align well with the experimental data. These findings offer valuable insights into the hydro‐mechanical coupling behavior of rocks, providing a foundation for safe construction practices in underground engineering.
Highlights The permeability variation of rocks during complete stress–strain processes was investigated. A mathematical model describing the influence of rock damage on permeability was constructed. The permeability–stress relationship between soft rock and hard rock was proposed.
Characterization of the permeability evolution of hard and soft rocks under hydro‐mechanical coupling conditions
Deep Underground Science and Engineering
Huang, Zhen (Autor:in) / Yu, Jian (Autor:in) / Wu, Yun (Autor:in) / Gong, Cong (Autor:in) / Li, Xiaozhao (Autor:in) / Zhao, Kui (Autor:in) / Moyo, Dickson (Autor:in)
05.03.2025
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| Taylor & Francis Verlag | 2023
Mechanical behaviour of Miocene hard soils and soft rocks
| British Library Conference Proceedings | 1999