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Engineering Behavior of Remolded Diatomaceous Silts

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https://ir.library.oregonstate.edu/concern/graduate_projects/db78tm13v

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  • Diatomaceous soils are a geological material whose engineering properties do not readily conform to the widely accepted and used mechanical and behavioral frameworks. This ambiguity results in design difficulties and geotechnical failures which can be costly. Diatomaceous soils have diatoms in their matrix. Diatoms are unicellular algae with an inert siliceous cell wall called a frustule. The rough surface area of the frustule contributes to diatomaceous soil’s high shear strength. The frustule has high intraparticle porosity which increases the water affinity of diatomaceous soils. This study used Atterberg limit, lab vane, constate rate of strain, and direct simple shear tests to characterize the geotechnical properties of remolded diatomaceous silts. The results showed the diatomaceous silts to have high strength, high liquid limits, and high compressibility. The results of the remolded diatomaceous silts were compared to those of undisturbed specimens. Both the compressibility ratio and peak shear strength (〖σ'〗_vc=400kPa) of remolded specimens were higher than of undisturbed specimens. The shear strength ratio and excess porewater generation of the two soil groups was similar at 25% strain.
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