Evaluating Cyclic Loading Response of a Low Plasticity Silt with Laboratory and Field Cyclic Loading Tests
Publication: Lifelines 2022
ABSTRACT
The cyclic behavior of a fine-grained low plasticity silty soil (plasticity index of approximately 15) at a site in Portland, Oregon, is characterized using a field and laboratory cyclic shear test program. The field cyclic tests were performed using the NHERI@UTexas large mobile shakers T-Rex and Rattler. The laboratory tests were performed using resonant column torsional shear and cyclic direct simple shear devices. The results of this testing program are used to evaluate the soil’s potential to develop excess pore water pressure with cyclic shear strains ranging from 0.00001% to 0.5%. The results of laboratory cyclic tests are compared against the results of field cyclic tests to predict the soil’s cyclic behavior during earthquakes. The field shaking and resonant column torsional shear tests showed significantly lower pore pressure ratios at shear strains up to 0.5% when compared to cyclic direct simple shear tests. These data will contribute to the larger body of knowledge of the cyclic behavior of low plasticity silts.
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Lifelines 2022
Pages: 114 - 125
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Published online: Nov 16, 2022
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