Sponsor
Portland State University. Department of Civil & Environmental Engineering
First Advisor
Arash Khosravifar
Term of Graduation
Summer 2020
Date of Publication
1-13-2020
Document Type
Thesis
Degree Name
Master of Science (M.S.) in Civil & Environmental Engineering
Department
Civil and Environmental Engineering
Language
English
Subjects
Shear strength of soils -- Testing, Soil liquefaction -- Pacific Northwest, Plasticity, Geotechnical engineering
DOI
10.15760/etd.7512
Physical Description
1 online resource (ix, 191 pages)
Abstract
A magnitude 9 Cascadia Subduction Zone earthquake is expected to trigger widespread liquefaction in loose material in Oregon. The geotechnical engineering studies have determined that the Willamette Silts may be susceptible to liquefaction or cyclic softening, as their plasticity indices ranges between non-plastic to low plasticity. While the majority of past studies have focused on liquefaction of sand and cyclic behavior of clays, there is not enough data on the cyclic response behavior of silty soils and the liquefaction susceptibility of these soils. A research focus in the geotechnical engineering program at Portland State University revolves around is performing cyclic tests on samples obtained from regional silts to fill the gap in data, in an effort to better characterize the liquefaction susceptibility of non-plastic to low plasticity silts. The primary goal of this thesis is to study the behavior of undrained cyclic shear resistance of low plastic fine-grained soils that were extracted from Beaverton, OR. The constant volume direct simple shear test device made by GeoComp is used to test the soil samples. The critical challenge in this project was to prepare close-to-identical remolded specimens to be able to evaluate intricate differences in the cyclic behavior of silts under different loading conditions. The thesis will present the cyclic shear resistance of laboratory prepared samples and the adopted procedures to prepare identical slurry samples.
Rights
In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
Persistent Identifier
https://archives.pdx.edu/ds/psu/34676
Recommended Citation
Almoumen, Rawan, "Undrained Cyclic Shear Resistance of Low Plastic Silts" (2020). Dissertations and Theses. Paper 5640.
https://doi.org/10.15760/etd.7512