Sponsor
Support for field shaking was provided by Grant No. CMMI-1935670 from the National Science Foundation.
Published In
Soil Dynamics and Earthquake Engineering
Document Type
Pre-Print
Publication Date
11-1-2022
Subjects
Soil remediation, Soil liquefaction, Soil stabilization
Abstract
The results of cyclic strain-controlled, constant volume direct simple shear (CDSS) tests and field shaking tests have been evaluated for intact, natural, low-plastic silts from six different fine-grained soils with 54%–100% fines content, 47%–83% silt content, and plasticity indices (PI) ranging from nonplastic to 16. These tests constitute a subset of a larger archive of CDSS tests performed on silt deposits from the Pacific Northwest, British Columbia, and Alaska collected and analyzed by the co-authors. The cyclic data are presented in this paper for two objectives: (a) to characterize cyclically-induced excess pore pressure generation in intermediate soils with various soil index properties and stress histories, and (b) to provide calibrated Vucetic and Dobry model parameters for simulating excess pore pressure generation in the silt soils based on the data and trends presented in the first objective. The CDSS test results showed that excess pore pressure ratios decrease with PI over the narrow range of PI evaluated and decrease with overconsolidation ratio. The cyclic threshold shear strain amplitude for pore pressure generation extracted from field shaking tests on silts were within the range proposed in the literature, confirming that the cyclic threshold shear strain amplitude is a fundamental soil property. Calibrated Vucetic and Dobry model parameters for these intermediate, fine-grained silts were significantly different than those reported for sands in the literature and were heavily influenced by the overconsolidation ratio. The calibrated parameters obtained in this study can be used as a benchmark in selecting model parameters for silts.
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DOI
10.1016/j.soildyn.2022.107482
Persistent Identifier
https://archives.pdx.edu/ds/psu/38464
Citation Details
Published as: Khosravifar, A., Dickenson, S., & Moug, D. (2022). Cyclic porewater pressure generation in intact silty soils. Soil Dynamics and Earthquake Engineering, 162, 107482.
Description
This is the author’s version of a work. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document.