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Geomechanics and Engineering Volume 18, Number 1, May20 2019 , pages 71-83 DOI: https://doi.org/10.12989/gae.2019.18.1.071 |
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Creep-permeability behavior of sandstone considering thermal-damage |
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Bo Hu, Sheng-Qi Yang and Wen-Ling Tian
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| Abstract | ||
| This investigation presented conventional triaxial and creep-permeability tests on sandstones considering thermally-induced damage (TID). The TID had no visible effects on rock surface color, effective porosity and permeability below 300oC TID level. The permeability enlarged approximately two orders of magnitude as TID increased to 1000oC level. TID of 700oC level was a threshold where the influence of TID on the normalized mass and volume of the specimen can be divided into two linear phases. Moreover, no prominent variations in the deformation moduli and peak strength and strain appeared as TID<500oC level. It is interesting that the peak strength increased by 24.3% at 700oC level but decreased by 11.5% at 1000oC level. The time-related deformation and steady-state creep rate had positive correlations with creep loading and the TID level, whereas the instantaneous modulus showed the opposite. The strain rates under creep failure stresses raised 1-4 orders of magnitude than those at low-stress levels. The permeability was not only dependent on the TID level but also dependent on creep deformation. The TID resulted in large deformation and complexity of failure pattern for the sandstone. | ||
| Key Words | ||
| thermally-induced damage; sandstone; physical changes; creep behavior; permeability | ||
| Address | ||
| Bo Hu, Sheng-Qi Yang and Wen-Ling Tian: State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, P.R. China | ||