NDLI: Study on the geological and engineering aspects of anhydrite/gypsum transition in the Arabian Gulf coastal deposits

Content Provider	Springer Nature Link
Author	Azam, Shahid
Copyright Year	2006
Abstract	Evaporitic geology, hot and arid climate, fluctuating relative humidity, and an alkaline environment governed the evolution of sedimentary deposits in the Arabian Gulf coast. Calcium sulphate generally occurs as anhydrite in the unsaturated surface layer of local soil formations. Anhydrite hydrates to gypsum with an associated volume increase of up to 63%, whereas gypsum dehydration results in a reversal back to anhydrite that leads to 39% volume decrease. Swelling and compressibility problems are common in several coastal deposits of the globe. This paper investigates the geological and engineering aspects of anhydrite/gypsum transition in the Arabian Gulf coast. Oedometer test results on Dammam anhydrite were studied in conjunction with morphological assessments at critical volume change stages. Results indicated 10% swelling potential and 295 kPa swelling pressure for hydrating anhydrite. The compression index of anhydrite and gypsum were 0.067 and 0.12, respectively, whereas the rebound index of anhydrite was 0.023.Un contexte évaporitique, un climat chaud et sec, une humidité relative variable et un environnement alcalin ont contrôlé l’évolution des dépôts sédimentaires de la côte du Golfe arabique. Le sulfate de calcium se présente généralement sous forme d’anhydrite dans la couche supérieure non saturée des formations superficielles. L’anhydrite s’hydrate en gypse avec une augmentation de volume pouvant atteindre 63% tandis que la déshydratation du gypse conduit, à l’inverse, à l’anhydrite avec une diminution de volume de 39%. Les problèmes de gonflement et de compressibilité sont communs dans plusieurs régions côtières du monde. L’article étudie les aspects géologique et d’ingénierie des transformations anhydrite/gypse sur la côte du Golfe arabique. Les résultats d’essais oedométriques sur l’anhydrite de Damman ont été analysés, en conjonction avec des caractérisations morphologiques à différentes étapes de changement volumique. Les résultats ont montré un potentiel de gonflement de 10% et une pression de gonflement de 295 kPa pour l’anhydrite en cours d’hydratation. Les indices de compression de l’anhydrite et du gypse étaient respectivement de 0,067 et 0,12 tandis que l’indice de gonflement de l’anhydrite était de 0,023.
Starting Page	177
Ending Page	185
Page Count	9
File Format	PDF
ISSN	14359529
Journal	Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur
Volume Number	66
Issue Number	2
e-ISSN	14359537
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-06-10
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gonflement Compressibilité Sulfate de calcium Anhydrite Gypse Nature Conservation Geoecology/Natural Processes Structural Foundations, Hydraulic Engineering Applied Geosciences
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology

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