American Society of Civil Engineers


Shear Strength Behavior of Highly Expansive Soil


by T. Y. Elkady, (Eng, Abdullah Bugshan Research Chair in Expansive Soils, Department of Civil Engineering, College of Engineering, King Saud University, P.O. Box 800, Riyadh, KSA, 11421 E-mail: telkady@ksu.edu.sa) and M. F. Abbas, (Eng, Abdullah Bugshan Research Chair in Expansive Soils, Department of Civil Engineering, College of Engineering, King Saud University, P.O. Box 800, Riyadh, KSA, 11421 E-mail: mabbas@ksu.edu.sa)
Section: Solving Geotechnical Problems Using the Mechanics of Unsaturated Soils, pp. 2532-2541, (doi:  http://dx.doi.org/10.1061/9780784412121.259)

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Document type: Conference Proceeding Paper
Part of: GeoCongress 2012: State of the Art and Practice in Geotechnical Engineering
Abstract: This study investigates the effect of loading path on the drained shear strength of Al-Qatif expansive clay obtained from the northeast region of Saudi Arabia. Testing was performed on statically compacted samples using strain controlled direct shear tests. Two loading paths simulating different field conditions were considered. First load path involved the inundation of test samples under target normal stress then shearing. Second load path involved inundation of test samples under low normal stress (10 kPa) followed by incremental increase in normal stress to target value before shearing. Results of the tests indicate that proposed loading path has an insignificant effect on the drained shear strength of tested samples. In addition, a unique relationship exists between drained shear strength and final water content for both load paths.


ASCE Subject Headings:
Shear strength
Expansive soils
Soil properties