Statistical analysis and correlation of physical and geotechnical properties of marine sediments in Eckernfoerde Bay, Baltic Sea /
The physical and geotechnical properties of marine sediments (upper 5 m) in Eckernfoerde Bay, Baltic Sea were measured in the laboratory or calculated based on in situ measurements. These properties include percent sand, silt, and clay, water content, bulk density, void ratio, porosity, effective ov...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=739668321&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | The physical and geotechnical properties of marine sediments (upper 5 m) in Eckernfoerde Bay, Baltic Sea were measured in the laboratory or calculated based on in situ measurements. These properties include percent sand, silt, and clay, water content, bulk density, void ratio, porosity, effective overburden pressure, undrained shear strength, dynamic shear modulus, and compressional and shear wave velocity. These sediments have some unique characteristics, including high water content, low bulk density, high void ratio, high porosity, low shear strength, low compressional and shear wave velocity, and high organic content. Selection of variables, formation and diagnostics of the models were conducted by applying SAS software. Relationships among these sediment properties were developed. Compressional wave velocity correlates with sand percent, water content, and undrained shear strength in non-gassy sediments. However, there is no usable relationship between compressional wave velocity and the sediment properties of gassy sediments. The reason for this might be due to the inaccurate compressional wave velocities measured in the laboratory. A new empirical model was developed for estimating the shear modulus of surficial sediments. Shear wave velocity calculated from the new model is comparable to those measured in situ when depth is more than 50 cm. When shear wave velocity was estimated based on the relationship between in situ measured shear modulus and depth, the calculated shear wave velocity was correlated with undrained shear strength, bulk density, and effective pressure. For non-gassy sediments, undrained shear strength increases with increasing depth or effective pressure. For gassy sediments, the increase of shear strength mainly depends on effective pressure. Compared to gassy sediments, the shear strength of non-gassy sediments increases more rapidly with depth or effective pressure. Using a paired t-test, the fall cone strengths calculated with Hansbo's and Wood's K60 values were found to underestimate and overestimate the vane shear strengths, respectively. However, the fall cone strengths calculated with a newly derived K60 value did not show significant difference when compared with the vane shear strengths. Calculations of sediment properties were based on the assumptions of saturation, constant grain density and salinity. The calculation errors due to these assumptions are negligible. |
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| Item Description: | Vita. "Major Subject: Oceanography". |
| Physical Description: | xiii, 149 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 141-148. |