Impacts of Unsaturated Conditions on The Ultimate Axial Capacity of Energy Piles
This study uses concepts from unsaturated soil mechanics to explain changes in axial capacity observed in geotechnical centrifuge experiments on semi-floating energy piles in unsaturated silt heated monotonically to different temperatures. Thermally-induced drying of the unsaturated silt surrounding...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2020-01-01
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| Series: | E3S Web of Conferences |
| Online Access: | https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/55/e3sconf_e-unsat2020_04005.pdf |
| _version_ | 1818672491154898944 |
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| author | Behbehani Fatemah McCartney John S. |
| author_facet | Behbehani Fatemah McCartney John S. |
| author_sort | Behbehani Fatemah |
| collection | DOAJ |
| description | This study uses concepts from unsaturated soil mechanics to explain changes in axial capacity observed in geotechnical centrifuge experiments on semi-floating energy piles in unsaturated silt heated monotonically to different temperatures. Thermally-induced drying of the unsaturated silt surrounding energy piles was observed during heating using temperature-corrected dielectric sensor readings. An effective stress-based equation for estimating the ultimate capacity was calibrated using the load-settlement curves for a pile at room-temperature, which was then used to estimate the ultimate capacities of energy piles under elevated temperatures using measured changes in degree of saturation near the energy pile. The predicted capacity matched well with the capacity from the experimental load-settlement curves, confirming the relevance of the effective stress principle in unsaturated soils in nonisothermal conditions and the importance of considering coupled heat transfer and water flow in unsaturated soils surrounding energy piles. |
| first_indexed | 2024-12-17T07:40:44Z |
| format | Article |
| id | doaj.art-b0f9a52d16f846128c42d568fa3a6b56 |
| institution | Directory Open Access Journal |
| issn | 2267-1242 |
| language | English |
| last_indexed | 2024-12-17T07:40:44Z |
| publishDate | 2020-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | E3S Web of Conferences |
| spelling | doaj.art-b0f9a52d16f846128c42d568fa3a6b562022-12-21T21:58:10ZengEDP SciencesE3S Web of Conferences2267-12422020-01-011950400510.1051/e3sconf/202019504005e3sconf_e-unsat2020_04005Impacts of Unsaturated Conditions on The Ultimate Axial Capacity of Energy PilesBehbehani Fatemah0McCartney John S.1Ph.D Student, Department of Structural Engineering, UC San DiegoProfessor and Chair, Department of Structural Engineering, UC San DiegoThis study uses concepts from unsaturated soil mechanics to explain changes in axial capacity observed in geotechnical centrifuge experiments on semi-floating energy piles in unsaturated silt heated monotonically to different temperatures. Thermally-induced drying of the unsaturated silt surrounding energy piles was observed during heating using temperature-corrected dielectric sensor readings. An effective stress-based equation for estimating the ultimate capacity was calibrated using the load-settlement curves for a pile at room-temperature, which was then used to estimate the ultimate capacities of energy piles under elevated temperatures using measured changes in degree of saturation near the energy pile. The predicted capacity matched well with the capacity from the experimental load-settlement curves, confirming the relevance of the effective stress principle in unsaturated soils in nonisothermal conditions and the importance of considering coupled heat transfer and water flow in unsaturated soils surrounding energy piles.https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/55/e3sconf_e-unsat2020_04005.pdf |
| spellingShingle | Behbehani Fatemah McCartney John S. Impacts of Unsaturated Conditions on The Ultimate Axial Capacity of Energy Piles E3S Web of Conferences |
| title | Impacts of Unsaturated Conditions on The Ultimate Axial Capacity of Energy Piles |
| title_full | Impacts of Unsaturated Conditions on The Ultimate Axial Capacity of Energy Piles |
| title_fullStr | Impacts of Unsaturated Conditions on The Ultimate Axial Capacity of Energy Piles |
| title_full_unstemmed | Impacts of Unsaturated Conditions on The Ultimate Axial Capacity of Energy Piles |
| title_short | Impacts of Unsaturated Conditions on The Ultimate Axial Capacity of Energy Piles |
| title_sort | impacts of unsaturated conditions on the ultimate axial capacity of energy piles |
| url | https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/55/e3sconf_e-unsat2020_04005.pdf |
| work_keys_str_mv | AT behbehanifatemah impactsofunsaturatedconditionsontheultimateaxialcapacityofenergypiles AT mccartneyjohns impactsofunsaturatedconditionsontheultimateaxialcapacityofenergypiles |