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Cyclic triaxial tests on clay subgrades for analytical pavement design
To introduce a performance specification, pavement foundations must be designed using analytical methods incorporating the laboratory measured parameters of resilient elastic modulus and resistance to permanent deformation of the subgrade and foundation materials. This paper presents results from a...
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| Main Authors: | , , |
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| Format: | Default Article |
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2004
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| Online Access: | https://hdl.handle.net/2134/3554 |
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| _version_ | 1818175465529016320 |
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| author | Matthew Frost Paul Fleming C.D.F. Rogers |
| author_facet | Matthew Frost Paul Fleming C.D.F. Rogers |
| author_sort | Matthew Frost (1247664) |
| collection | Figshare |
| description | To introduce a performance specification, pavement foundations must be designed using analytical methods incorporating the laboratory measured parameters of resilient elastic modulus and resistance to permanent deformation of the subgrade and foundation materials. This paper presents results from a program of repeated load triaxial tests performed on a range of fine-grained subgrades prepared in a number of states to evaluate these parameters for various design conditions. The results highlight several difficulties in measuring small strains on ‘undisturbed’ soils over a large strain range and in predicting and modeling long-term behavior. However testing at higher strains has shown that the deviator stress at which the cumulative permanent deformation starts to increase significantly, termed the ‘threshold stress’, approximates to 50% of the deviator stress at failure. In addition, the resilient modulus of the soils is shown to approach a low asymptotic value at higher deviator stress. Comparison between elastic and plastic behavior shows that the deviator stress at ‘threshold’ coincides with the stiffness asymptote. Using these correlations a simplified mechanistic design method for pavement foundations is proposed. |
| format | Default Article |
| id | rr-article-9442193 |
| institution | Loughborough University |
| publishDate | 2004 |
| record_format | Figshare |
| spelling | rr-article-94421932004-01-01T00:00:00Z Cyclic triaxial tests on clay subgrades for analytical pavement design Matthew Frost (1247664) Paul Fleming (1249968) C.D.F. Rogers (7175927) Other built environment and design not elsewhere classified Resilient stiffness Repeated load Triaxial testing Pavement design Permanent deformation Built Environment and Design not elsewhere classified To introduce a performance specification, pavement foundations must be designed using analytical methods incorporating the laboratory measured parameters of resilient elastic modulus and resistance to permanent deformation of the subgrade and foundation materials. This paper presents results from a program of repeated load triaxial tests performed on a range of fine-grained subgrades prepared in a number of states to evaluate these parameters for various design conditions. The results highlight several difficulties in measuring small strains on ‘undisturbed’ soils over a large strain range and in predicting and modeling long-term behavior. However testing at higher strains has shown that the deviator stress at which the cumulative permanent deformation starts to increase significantly, termed the ‘threshold stress’, approximates to 50% of the deviator stress at failure. In addition, the resilient modulus of the soils is shown to approach a low asymptotic value at higher deviator stress. Comparison between elastic and plastic behavior shows that the deviator stress at ‘threshold’ coincides with the stiffness asymptote. Using these correlations a simplified mechanistic design method for pavement foundations is proposed. 2004-01-01T00:00:00Z Text Journal contribution 2134/3554 https://figshare.com/articles/journal_contribution/Cyclic_triaxial_tests_on_clay_subgrades_for_analytical_pavement_design/9442193 CC BY-NC-ND 4.0 |
| spellingShingle | Other built environment and design not elsewhere classified Resilient stiffness Repeated load Triaxial testing Pavement design Permanent deformation Built Environment and Design not elsewhere classified Matthew Frost Paul Fleming C.D.F. Rogers Cyclic triaxial tests on clay subgrades for analytical pavement design |
| title | Cyclic triaxial tests on clay subgrades for analytical pavement design |
| title_full | Cyclic triaxial tests on clay subgrades for analytical pavement design |
| title_fullStr | Cyclic triaxial tests on clay subgrades for analytical pavement design |
| title_full_unstemmed | Cyclic triaxial tests on clay subgrades for analytical pavement design |
| title_short | Cyclic triaxial tests on clay subgrades for analytical pavement design |
| title_sort | cyclic triaxial tests on clay subgrades for analytical pavement design |
| topic | Other built environment and design not elsewhere classified Resilient stiffness Repeated load Triaxial testing Pavement design Permanent deformation Built Environment and Design not elsewhere classified |
| url | https://hdl.handle.net/2134/3554 |