An Exploratory Experimental Evaluation of ε50 in Cohesive Granular (C-ϕ) Soils
In this research, the effects of several factors which may affect the strain at 50% of maximum deviatoric principle stress, ε50, of c-ϕ (cohesive granular) soils are explored. C-ϕ materials are described as mixed soils exhibiting both granular and cohesive properties and typically consist of 15%-35% plastic clay/silt with PI>7. These soils are often encountered in the design of deep foundations and the common practice is to treat them either as cohesionless or cohesive soils (i.e. assuming one behavior or another). ε50 is one of the parameters in the design of deep foundations under axial and lateral loading that some analysis procedures such as p-y and t-z methods make use of this parameter. However, available literature provide limited recommendations for ε50 values in c-ϕ materials. In this study, the effects of several relative density and effective consolidation stress on ε50 are evaluated through a series of consolidated undrained triaxial tests (CU) on different c-ϕ soil samples. This research explores empirical correlations with key characteristics of c-ϕ soils and preliminary results are presented.
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Supplemental Notes:
- This paper was sponsored by TRB committee AFS30 Standing Committee on Foundations of Bridges and Other Structures. Alternate title: Exploratory Experimental Evaluation of Ε50 in Cohesive Granular (C-Phi) Soils.
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Corporate Authors:
500 Fifth Street, NW
Washington, DC United States 20001 -
Authors:
- Ostovar, Maryam
- Motamed, Ramin
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Conference:
- Transportation Research Board 96th Annual Meeting
- Location: Washington DC, United States
- Date: 2017-1-8 to 2017-1-12
- Date: 2017
Language
- English
Media Info
- Media Type: Digital/other
- Features: Figures; Photos; References; Tables;
- Pagination: 13p
- Monograph Title: TRB 96th Annual Meeting Compendium of Papers
Subject/Index Terms
- TRT Terms: Cohesive soils; Consolidation; Density; Foundations; Granular soils; Soil tests; Triaxial shear tests
- Subject Areas: Bridges and other structures; Geotechnology; Highways;
Filing Info
- Accession Number: 01626522
- Record Type: Publication
- Report/Paper Numbers: 17-02548
- Files: TRIS, TRB, ATRI
- Created Date: Feb 27 2017 9:25AM