Abstract
Dihydrate gypsum was formed after the anhydrite was immersed in water, and the volume of rock increased significantly. In order to analyze the expansion properties of Ordovician anhydrite rock, anhydrite rock samples (regenerated anhydrite rock) were obtained by high temperature drying of anhydrite rock samples, and then the rock expansibility. Experiments show that: (1) Regenerated anhydrite rock exhibits four typical stages in both axial and radial expansion deformation: I linear rapid expansion stage, concave stage, II linear expansion stage and constant stage, in which II linear expansion stage is the main expansion stage, accounting for 50%-60% of the total expansion;(2) the axial expansion rate is 2.6% and radial expansion rate is 0.7%, and axial expansion deformation of rock is 2.6∼3.2 times of radial expansion.
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