Approach for Estimating Effective Friction Angle from Cone Penetration Test in Unsaturated Residual Soils
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 143, Issue 11
Abstract
This paper proposes approaches to estimate effective friction angle from cone tip resistance with incorporation of matric suction. Cone penetration tests (CPTs) are performed in unsaturated residual soil layers, where matric suction is measured with depth. Unsaturated triaxial testing is performed on retrieved samples adjacent to the CPT soundings. In addition, the proposed model incorporates a more robust stress state through the use of coefficient of earth pressure at rest () and overconsolidation ratio (OCR). Results indicate that reducing the CPT tip resistance data without incorporating the matric suction effect leads to 6–9° overestimations of the friction angle (the matric suction was approximately 80–90 kPa in type MH soil). The incorporation of a more representative stress state using the mean effective stress in the CPT data reduction leads to a 2–3° reduction of the estimated friction angle compared with traditional approaches for OCR values equal to or greater than 2.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 143 • Issue 11 • November 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Dec 29, 2016
Accepted: Jun 12, 2017
Published online: Sep 14, 2017
Published in print: Nov 1, 2017
Discussion open until: Feb 14, 2018
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