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The underground gypsum mine of Grozon shows instabilities that are function of the mining age. The constitutive minerals in samples from older mining areas show dissolution traces. Concerning the physical properties and instantaneous mechanical behaviour, few differences among gypsum of different exploited ages are to be noted. However, gypsum is more dissolved in the oldest areas. Laboratory tests show that creep mechanical behaviour of this rock is strongly influenced by the hygrometry. The strain rate is higher for the samples coming from the oldest areas.

Influence du temps et de l’hygrométrie sur le comportement du gypse