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Communication Dans Un Congrès Année : 2012

Very slow creep tests on rock samples

Résumé

Twelve years ago, creep tests at very low deviatoric stress were performed on an Etrez salt sample in the Varangéville Mine. Recently, a new testing campaign was performed on various salt samples to gain further insight on salt behavior. Creep tests are performed under a 0.1 MPa uniaxial loading on rock-salt samples from the Varangéville and Avery Island Mines and under a 0.24 MPa uniaxial loading on a crushed-salt sample. To minimize the effects of temperature variations, testing devices were placed in an underground mine room, where temperature fluctuations are of the order of one-hundredth of a degree Celsius. The me-chanical loading is provided by dead weights. The deformations were measured through special displacement sensors with a resolution of 1/80 µm. A typical steady-state strain rate reached after 6 months is -2.4 × 10-12 s-1. The influence of air hygrometry, which is approximately 74%RH in the mine, is smaller than expected.
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Dates et versions

hal-00786923 , version 1 (11-02-2013)

Identifiants

  • HAL Id : hal-00786923 , version 1

Citer

Pierre Berest, Jean François Béraud, Mathieu Bourcier, Alexandre Dimanov, Hakim Gharbi, et al.. Very slow creep tests on rock samples. Mechanical Behavior of Salt VII, Apr 2012, France. pp.81-88. ⟨hal-00786923⟩
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