THE EFFECT OF WATER FLOW RATE ON THE DISSOLUTION OF GYPSUM AND ANHYDRITE LAYERS IN HYDRAULIC STRUCTURES FOUNDATIONMoazzami Ali Reza, Noori Gheidari Mohammad and Moazzami Amir RezaAbstract The existence of gypsum and anhydrite in materials which are located in places, in which high water flow rate and permeability are significant, is worrisome. Experiences and researches show in regions with low flow rate the probability of dissolution is lower and if the water flow has been saturated before contacting with gypsum in this case the solubility decreases too, so evaluating the behavior of these materials against these factors seems to be necessary. In this research, by performing tests on materials with gypsum the solubility rate of gypsum in two kinds of distilled water and distilled water with one percent sodium chloride is measured and the amounts of dissolution coefficient by using circulation tests in front of the above solutions have been measured and calculated in different speeds.
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