TJES: Zedan AJ, Abbas HH, .Experimental Investigation of Square Footing Resting on Sand over Gypseous Soils. Tikrit Journal of Engineering Sciences 2020; 27(1): 30- 39.

APA: Zedan,  A. J., Abbas, H. H. (2020). Experimental Investigation of Square Footing Resting on Sand over Gypseous Soils. Tikrit Journal of Engineering Sciences, 27 (1), 30- 39.


[1] Das BM. Shallow Foundations, Bearing Capacity and Settlement, 2nd Ed., Taylor & Francis Group, 1 p, (2009).

[2] Al-Kaabi FS. “Distribution of the Gypsiferous Soil in Iraq, State Company of Geological Survey and Mining”, Report No.3044, Iraq, Baghdad, (2007) In Arabic.

[3] Al-Janabi FH. “Soil Treated with Fuel Oil,” M.Sc. Thesis, Building and Construction Department, University of Technology, (2002).

[4] Button SJ. “The Bearing Capacity of Footing on Two-Layer Cohesive Subsoil”, Proceedings of the 3rd International Conference on Soil Mechanics and Foundation Engineering, vol. 1, pp. 332-335, (1953).

[5] Reddy AS. & Srinivasan RJ. “Bearing Capacity of Footings on Layered Clays”, Journal of the Soil Mechanics and Foundations Division, ASCE, Vol. 96, No. 9, pp. 1951-1965, (1967).

[6] Brown JD. & Meyerhof GG. “Experimental Study of Bearing Capacity in Layered Clays”, Proceedings of the 7th International Conference on Soil Mechanics and Foundation Engineering, Mexico, vol. 2, pp. 45-51, (1969).

[7] Meyerhof GG. “Ultimate Bearing Capacity of Footings on Sand Layer Overlying Clay”, Canadian Geotechnical Journal, Vol.11, No.2, pp. 223-229, (1974).

[8] Abid Awn SH. “Improvement of Gypseous Soil by Pre-Wetting”. Diyala Journal of Engineering Sciences 2011; 4(1): 71-82.

[9] Ibrahim AN, Schanz T. “Gypseous Soil Improvement by Silicone Oil\\\”. Al-Nahrain Journal for Engineering Sciences 2017; 20(1): 49-58.

[10] Zedan AJ, Hummadi RA, Hussein SA. “Effect of Adding Mixture of (Concrete Waste and Asphalt Waste) on the Properties of Gypseous Soil”. Tikrit Journal of Engineering Sciences 2019; 26(1):20-25.

[‏ [11] Al-Mufty AA and Nashat IH. “Gypsum Content Determination in Gypseous Soils and Rocks”, 3rd International Jordanian Conference on Mining, pp. 500-506, (2000).

[12] ASTM (American Society for Testing Materials), (2010), Vol. 04.08 and 04.09, Soil and Rock, West Conshohocken, United States. [13] Bowles JE. Foundation Analysis and Design, 5th Edition, McGraw-Hill Book Co. New York, 253 p, (1996).


Tikrit Journal of Engineering Sciences (2020) 27(1) 30- 39.

Experimental Investigation of Square Footing Resting on Sand over Gypseous Soils

Adnan Jayed Zedan *, Heba H. Abbas

Department of Civil Engineering, College of Engineering, Tikrit University, Iraq

* Corresponding author: jayedadn@tu.edu.iq  

DOI: https://doi.org/10.25130/tjes.27.1.05


This study included (40) tests of loading a square footing (100*100 mm) resting on two layered soils (sand over gypseous soils) using a steel box with the dimensions of (900*900*500 mm). Gypseous soil was brought from Tikrit-University with gypsum content 61%. The tests were divided into two groups. The first groups included (4) tests for gypseous soil only by using the field and maximum densities (14.5, 18.75 kN/m3) respectively, without soaking and with soaking where gypseous soil lost a great value of its resistance. The second group included (36) tests of loading two layers of soil by replacing a layer of gypseous soil by sandy soil with relative density (30%, 60%, and 80%) and depths (B/2, B and 3/2 B). The results showed that the replacement process gave an improvement in the bearing capacity when the gypseous soil was compacted to field density and soaked with a relative density of sand (80%) while the other cases did not have any improvement. The results of loading the two layers of soil also show that the soaking of gypseous soil under the sandy layer affects on the resistance of sand through reducing it especially when the depth of sand was (B/2) this effect decreased gradually with increase in the depth of the sandy layer.


Keywords: Shallow foundation, Two layers of soil, Gypseous soil, Sandy soil, Soaking

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