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Effect of Improvement of Collapsible Soils with Bitumen Emulsions on Collapsibility Rate for Varying Degrees of Saturation

Abdul Kareem E. Zainal


Collapsible soils are one of many problematic soils in Iraq. Many foundation failure problems that occurred in Iraq are associated with percolation of water; the change in the degree of saturation can affect the stability of these soils and may encounter large volumetric change. A series of tests conducted on collapsible soil using oedometer apparatus and the settlement–time curves are determined accurately, then each test is determined to a different degree of saturation through two ways inundation—one of the top of the soil simulating infiltration condition, and the other way is from the bottom which simulate capillary water rise. These results were used to predict the rapid volume change (collapse) for the soil with time (collapsibility rate). The results of volume change (settlement) with suction control was performed in a standard oedometer device for the natural dry density of collapsible soils for varying degree of saturation after the inundation, without applying any loads. The same tests were conducted after improvement of top surface only as one case; and the top and bottom surfaces of soil sample as another case of bitumen emulsions. The comparison of the results obtained from the experimental tests with and without improving the surface of soil sample was presented in graphical forms.


Keywords: Collapsible soil, matric suction, collapsibility rate, degree of saturation

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Lefebvre G. Collapse Mechanisms and Design Considerations for Some Partly Saturated and Saturated Soils. In: Derbyshire E, Dijkstra T, Smalley IJ (Eds.). Genesis and Properties of Collapsible Soils. Netherlands: Kluwer Academic Publishers; 1995. 361–74p.

Fredlund DG, Gan JKM. The Collapse Mechanism of a Soil Subjected to One Dimensional Lading and Wetting. In: Derbyshire E, Dijkstra T, Smalley IJ (Eds.). Genesis and Properties of Collapsible Soils. Netherlands: Kluwer Publishers; 1995. 173–205p.

Rust E, Heymann G, Jones GA. Collapse Potential of Partly Saturated Sandy Soils from Mozal, Mzambique. J S Afr Inst Civ Eng. 2005; 47(1): 8–14p.

Fattah MY, Yahya AY, Ahmed BA. Total and Matric Suction measurement of Unsaturated Soils in Baghdad Region by Filter Paper Method. J Eng. 2012; 18(5): 611–20p.

Berney ES, Peter JF, Smith DM. The Thermodynamics of Three-Phase Partially Saturated Soil. Proceedings of the 16th ASCE Engineering Mechanics Conference; 2003 Jul 16–18; Seattle, USA.

Amundaray JI, Boiero A. Collapsible Clayey Soils at the North-Eastern Region. Proceedings of the Pan-AmCGSGeotechnical Conference; 2011 Oct 2–6, Toronto, Ontario, Canada.

Blight GE. Unsaturated Soil Mechanics in Geotechnical Practice. London, UK: Taylor & Francis Group; 2013.

Cai GQ, Zhou AN, Sheng D. Predicting the Dependency of a Permeability Function on Initial Density for Unsaturated Soils. In: Khalili, Russell, Khoshghalb (Eds.). Unsaturated Soils: Research & Application. London, UK: Taylor & Francis Group; 2014. ISBN 978-1-38-00150-3.1091–7p.

Zainal AE, Al-Ebadi LH. The Effect of Varying Degree of Saturation on Settlement Rate of Collapsible Soils. Appl Res J. 2016; 2(1): 27–42p.

ASTM D5333-92. Standard Test Method for Measurement of Collapse Potential of Soils. West Conshohocken, PA: ASTM International; 1993.

Fredlund DG, Rahardjo H, Fredlund MD. Unsaturated Soil Mechanics in Engineering Practice. New Jersey: John Wiley & Sons Inc.; 2012.

Manual. Santa Barbara, CA, USA: Soil Moisture Equipment Corporation; 2009. Available from:

Tadepalli R, Fredlund DG. The Collapse Behavior of a Compacted Soil during Inundation. Canad Geotech J. 1991; 28: 477–88p.

Al-Kawaaz NGA. Characteristics of Soil-Asphalt Mixture. M. Sc. Thesis. Iraq: Baghdad University; 1990.



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