Abstract
Permeability is an important factor for seepage analysis of rock material, and a key factor in ensuring the safety of underground works. In this study, the permeability evolution of granite gneiss during triaxial creep tests was investigated. In the context of an underground oil storage cavern in China, a series of hydro-mechanical coupling creep tests were conducted on rock cores of granite gneiss at three different pore pressures to reveal the effect of pore pressure on the permeability evolution and to investigate the correlation between the permeability and volumetric strain during the creep process. During the creep tests, the permeability decreases in the initial loading phase. At all deviatoric stress levels, the permeability remains stable in the steady creep stage and increases rapidly in the accelerated creep stage. Based on the test data, the initial permeability, steady permeability and peak permeability at various stress levels are defined. The effect of pore pressure on the permeability is captured by a linear model. In addition, the relationship between permeability and volumetric strain can be described as a process divided into three phases, with different functions in each phase.
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This work was supported by the National Natural Science Foundation of China (Nos. 11172090, 51479049 and 51209075).
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Liu, L., Xu, W.Y., Wang, H.L. et al. Permeability Evolution of Granite Gneiss During Triaxial Creep Tests. Rock Mech Rock Eng 49, 3455–3462 (2016). https://doi.org/10.1007/s00603-016-0999-8
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DOI: https://doi.org/10.1007/s00603-016-0999-8