A Unified Elastoplastic Model of Unsaturated Soils Considering Capillary Hysteresis
Unlike its saturated counterparts, the mechanical behavior of an unsaturated soil depends not only upon its stress history but also upon its hydraulic history. In this paper, a soil-water characteristic relationship which is capable of describing the effect of capillary hysteresis is introduced to c...
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | Journal of Applied Mathematics |
| Online Access: | http://dx.doi.org/10.1155/2013/537185 |
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| author | Tiantian Ma Changfu Wei Pan Chen Huihui Tian De'an Sun |
| author_facet | Tiantian Ma Changfu Wei Pan Chen Huihui Tian De'an Sun |
| author_sort | Tiantian Ma |
| collection | DOAJ |
| description | Unlike its saturated counterparts, the mechanical behavior of an unsaturated soil depends not only upon its stress history but also upon its hydraulic history. In this paper, a soil-water characteristic relationship which is capable of describing the effect of capillary hysteresis is introduced to characterize the influence of hydraulic history on the skeletal deformation. The capillary hysteresis is viewed as a phenomenon associated with the internal structural rearrangements in unsaturated soils, which can be characterized by using a set of internal state variables. It is shown that both capillary hysteresis and plastic deformation can be consistently addressed in a unified theoretical framework. Within this context, a constitutive model of unsaturated soils is developed by generalizing the modified Cam-Clay model. A hardening function is introduced, in which both the matric suction and the degree of saturation are explicitly included as hardening variables, so that the effect of hydraulic history on the mechanical response can be properly addressed. The proposed model is capable of capturing the main features of the unsaturated soil behavior. The new model has a hierarchical structure, and, depending upon application, it can describe the stress-strain relation and the soil-water characteristics in a coupled or uncoupled manner. |
| format | Article |
| id | doaj-art-9a35b4e66b97427796b2091b98587a7b |
| institution | Kabale University |
| issn | 1110-757X 1687-0042 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Applied Mathematics |
| spelling | doaj-art-9a35b4e66b97427796b2091b98587a7b2025-02-03T06:10:50ZengWileyJournal of Applied Mathematics1110-757X1687-00422013-01-01201310.1155/2013/537185537185A Unified Elastoplastic Model of Unsaturated Soils Considering Capillary HysteresisTiantian Ma0Changfu Wei1Pan Chen2Huihui Tian3De'an Sun4State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Xiaohongshan, Wuchang, Wuhan, Hubei 430071, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Xiaohongshan, Wuchang, Wuhan, Hubei 430071, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Xiaohongshan, Wuchang, Wuhan, Hubei 430071, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Xiaohongshan, Wuchang, Wuhan, Hubei 430071, ChinaDepartment of Civil Engineering, Shanghai University, Shanghai 200072, ChinaUnlike its saturated counterparts, the mechanical behavior of an unsaturated soil depends not only upon its stress history but also upon its hydraulic history. In this paper, a soil-water characteristic relationship which is capable of describing the effect of capillary hysteresis is introduced to characterize the influence of hydraulic history on the skeletal deformation. The capillary hysteresis is viewed as a phenomenon associated with the internal structural rearrangements in unsaturated soils, which can be characterized by using a set of internal state variables. It is shown that both capillary hysteresis and plastic deformation can be consistently addressed in a unified theoretical framework. Within this context, a constitutive model of unsaturated soils is developed by generalizing the modified Cam-Clay model. A hardening function is introduced, in which both the matric suction and the degree of saturation are explicitly included as hardening variables, so that the effect of hydraulic history on the mechanical response can be properly addressed. The proposed model is capable of capturing the main features of the unsaturated soil behavior. The new model has a hierarchical structure, and, depending upon application, it can describe the stress-strain relation and the soil-water characteristics in a coupled or uncoupled manner.http://dx.doi.org/10.1155/2013/537185 |
| spellingShingle | Tiantian Ma Changfu Wei Pan Chen Huihui Tian De'an Sun A Unified Elastoplastic Model of Unsaturated Soils Considering Capillary Hysteresis Journal of Applied Mathematics |
| title | A Unified Elastoplastic Model of Unsaturated Soils Considering Capillary Hysteresis |
| title_full | A Unified Elastoplastic Model of Unsaturated Soils Considering Capillary Hysteresis |
| title_fullStr | A Unified Elastoplastic Model of Unsaturated Soils Considering Capillary Hysteresis |
| title_full_unstemmed | A Unified Elastoplastic Model of Unsaturated Soils Considering Capillary Hysteresis |
| title_short | A Unified Elastoplastic Model of Unsaturated Soils Considering Capillary Hysteresis |
| title_sort | unified elastoplastic model of unsaturated soils considering capillary hysteresis |
| url | http://dx.doi.org/10.1155/2013/537185 |
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