Engineering properties of low to medium overconsolidation ratio offshore clays
This paper presents a summary of the geotechnical engineering properties of low to medium overconsolidation ratio offshore inorganic clays derived from a high quality database. These properties, such as preconsolidation stress and undrained shear strength, are required for design of most offshore in...
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| Format: | Article |
| Language: | English |
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AIMS Press
2019-09-01
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| Series: | AIMS Geosciences |
| Online Access: | https://www.aimspress.com/article/10.3934/geosci.2019.3.535/fulltext.html |
| _version_ | 1811209771260313600 |
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| author | Don J. DeGroot Tom Lunne Ravindra Ghanekar Siren Knudsen Cody D. Jones Tor Inge Yetginer-Tjelta |
| author_facet | Don J. DeGroot Tom Lunne Ravindra Ghanekar Siren Knudsen Cody D. Jones Tor Inge Yetginer-Tjelta |
| author_sort | Don J. DeGroot |
| collection | DOAJ |
| description | This paper presents a summary of the geotechnical engineering properties of low to medium overconsolidation ratio offshore inorganic clays derived from a high quality database. These properties, such as preconsolidation stress and undrained shear strength, are required for design of most offshore infrastructure and for assessment of offshore geohazards. The database was developed through a series of Joint Industry Projects using results from offshore site investigations performed worldwide. The key feature of the database is that it only contains results obtained using good to excellent quality samples that were tested using advanced laboratory procedures such as constant rate of strain consolidation and consolidated undrained triaxial and direct simple shear. A secondary objective of the paper was to examine common empirical correlations between index tests (e.g., water content, Atterberg limits) and soil design parameters using the new database. Such empirical correlations between simple and inexpensive index tests and more costly advanced laboratory tests can serve a valuable purpose in offshore infrastructure design. This is particularly the case for preliminary design at early stages of projects where little information is known about soil properties, for small projects with limited site characterization budgets, and international projects at locations where advanced laboratory tests performed to international standards are not available. The paper describes development of the database and presents summary results and plots for undrained shear strength, in situ stress state, and consolidation and flow parameters. Results from the empirical correlations investigated are presented and the paper concludes with recommendations on use of the data and correlations in practice. The recommendations are limited to clays of low to medium overconsolidation ratio and are not applicable to highly overconsolidated and desiccated clays. While the database primarily consists of offshore clays, the correlations presented should also be applicable to terrestrial clays. |
| first_indexed | 2024-04-12T04:44:31Z |
| format | Article |
| id | doaj.art-4ed53081e2f643219b0918b884b07d43 |
| institution | Directory Open Access Journal |
| issn | 2471-2132 |
| language | English |
| last_indexed | 2024-04-12T04:44:31Z |
| publishDate | 2019-09-01 |
| publisher | AIMS Press |
| record_format | Article |
| series | AIMS Geosciences |
| spelling | doaj.art-4ed53081e2f643219b0918b884b07d432022-12-22T03:47:32ZengAIMS PressAIMS Geosciences2471-21322019-09-015353556710.3934/geosci.2019.3.535Engineering properties of low to medium overconsolidation ratio offshore claysDon J. DeGroot0Tom Lunne1Ravindra Ghanekar2Siren Knudsen3Cody D. Jones4Tor Inge Yetginer-Tjelta51 Department of Civil and Environmental Engineering, University of Massachusetts Amherst, Amherst, MA, 01003 USA2 Norwegian Geotechnical Institute, N-0806 Oslo, Norway3 Oil & Natural Gas Corporation Ltd., Mumbai, India2 Norwegian Geotechnical Institute, N-0806 Oslo, Norway4 Benthic USA LLC, Houston, TX 77043 USA5 Equinor, 4033 Stavanger, NorwayThis paper presents a summary of the geotechnical engineering properties of low to medium overconsolidation ratio offshore inorganic clays derived from a high quality database. These properties, such as preconsolidation stress and undrained shear strength, are required for design of most offshore infrastructure and for assessment of offshore geohazards. The database was developed through a series of Joint Industry Projects using results from offshore site investigations performed worldwide. The key feature of the database is that it only contains results obtained using good to excellent quality samples that were tested using advanced laboratory procedures such as constant rate of strain consolidation and consolidated undrained triaxial and direct simple shear. A secondary objective of the paper was to examine common empirical correlations between index tests (e.g., water content, Atterberg limits) and soil design parameters using the new database. Such empirical correlations between simple and inexpensive index tests and more costly advanced laboratory tests can serve a valuable purpose in offshore infrastructure design. This is particularly the case for preliminary design at early stages of projects where little information is known about soil properties, for small projects with limited site characterization budgets, and international projects at locations where advanced laboratory tests performed to international standards are not available. The paper describes development of the database and presents summary results and plots for undrained shear strength, in situ stress state, and consolidation and flow parameters. Results from the empirical correlations investigated are presented and the paper concludes with recommendations on use of the data and correlations in practice. The recommendations are limited to clays of low to medium overconsolidation ratio and are not applicable to highly overconsolidated and desiccated clays. While the database primarily consists of offshore clays, the correlations presented should also be applicable to terrestrial clays.https://www.aimspress.com/article/10.3934/geosci.2019.3.535/fulltext.html |
| spellingShingle | Don J. DeGroot Tom Lunne Ravindra Ghanekar Siren Knudsen Cody D. Jones Tor Inge Yetginer-Tjelta Engineering properties of low to medium overconsolidation ratio offshore clays AIMS Geosciences |
| title | Engineering properties of low to medium overconsolidation ratio offshore clays |
| title_full | Engineering properties of low to medium overconsolidation ratio offshore clays |
| title_fullStr | Engineering properties of low to medium overconsolidation ratio offshore clays |
| title_full_unstemmed | Engineering properties of low to medium overconsolidation ratio offshore clays |
| title_short | Engineering properties of low to medium overconsolidation ratio offshore clays |
| title_sort | engineering properties of low to medium overconsolidation ratio offshore clays |
| url | https://www.aimspress.com/article/10.3934/geosci.2019.3.535/fulltext.html |
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