First Advisor

Diane Moug

Term of Graduation

Fall 2020

Date of Publication


Document Type


Degree Name

Master of Science (M.S.) in Civil & Environmental Engineering


Civil and Environmental Engineering




Soil mechanics -- Mathematical models, Silt -- Pacific Northwest, Geotechnical engineering



Physical Description

1 online resource (iii, 40 pages)


Soils that are intermediate to sands and clays are a challenge for geotechnical engineers since most methods for interpreting soil properties or soil behaviors are based on sands or clays and do not address behaviors of intermediate soils. This is a particular challenge for engineers in the Portland-area where many of the major soil units are composed of intermediate soils. Analysis of intermediate soils is further challenged since many standard constitutive models are based on sandy or clay-like soils. However, the MIT-S1 constitutive model is capable of capturing intermediate soil behavior. A calibration of the MIT-S1 constitutive model for Portland-area intermediate soils is presented. Calibration of an MIT-S1 constitutive model for a Portland-area intermediate soil will be useful for developing relationships with in-situ tests such as the cone penetration test (CPT). The calibration includes a limited compression curve (LCC) characterization of a silt slurry mixture sourced from a local soil unit to establish high stress, 1-D compression parameter values. Numerical analysis is included for additional key constitutive model properties. Parameter values are derived through the use of the model simulation software (Itasca FLAC) and comparison to laboratory data from undrained direct simple shear (UDSS) tests. The calibration prioritizes MIT-S1 model parameters associated with 1-D compression and the transition from contractive to dilative behavior in shear.


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