Geotechnical characterization of sediments from Hydrate Ridge, Cascadia Continental Margin
Name
56132440-MIT.pdf
Description
Full printable version
Size
29.4 MB
Format
Adobe PDF
Checksum (MD5)
79cf61d2932e0c8f321280dee1130f40
Author(s)
Tan, Brian B. (Brian Bautista), 1979-
Advisor(s)
John T. Germaine.
Date Issued
2004
Publisher
Massachusetts Institute of Technology
Abstract
Eight whole core sediment samples were obtained from ODP Site 1244, Hydrate Ridge, Cascadia Continental Margin with the goal of understanding the stress history, consolidation behavior and strength characteristics of the soil. A series of Constant Rate of Strain Consolidation (CRSC) and Ko- Consolidated Undrained triaxial (CKoU) tests were performed in order to study the behavior. In addition, Atterberg limits and x-ray diffraction were performed in order to better classify the material. One of the key issues regarding this soil is the level of disturbance imparted during sampling and transportation. Evidence of the disturbance are cracks and voids in x-rays, as well as highly rounded compression curves. Established soil quality criteria have shown the soil to have poor quality. A new criterion comparing the initial loading to the reload cycle shows that soil quality varies, but has no pattern with depth. Nonetheless, highly disturbed samples and trimmings from previous tests were resedimented to produce better quality specimens for consolidation and strength testing. Conventional application of the strain energy method yielded high preconsolidation pressures that indicate the soil is normal to overconsolidated (1
(cont.) This analysis provides an upper and lower bound factor that is applied to the strain energy preconsolidation pressure. The result is a reduced preconsolidation pressure that indicates the soil is underconsolidated (0.2
Description
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2004.
Includes bibliographical references.
Subjects
Civil and Environmental Engineering.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
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