A Fractional Creep Constitutive Model for Frozen Soil in Consideration of the Strengthening and Weakening Effects
The triaxial creep tests of frozen silty clay mixed with sands were performed under different pressures, and the test results demonstrated that, under the low confining pressure, when the shear stress is lower than the long-term strength, the test specimen exhibits an attenuation creep because the s...
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| Format: | Article |
| Language: | English |
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Wiley
2016-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2016/5740292 |
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| author | Feng Hou Quanming Li Enlong Liu Cheng Zhou Mengke Liao Huiwu Luo Xingyan Liu |
| author_facet | Feng Hou Quanming Li Enlong Liu Cheng Zhou Mengke Liao Huiwu Luo Xingyan Liu |
| author_sort | Feng Hou |
| collection | DOAJ |
| description | The triaxial creep tests of frozen silty clay mixed with sands were performed under different pressures, and the test results demonstrated that, under the low confining pressure, when the shear stress is lower than the long-term strength, the test specimen exhibits an attenuation creep because the strengthening effect is greater than the weakening effect. When the shear stress is higher than the long-term strength, the test specimen exhibits a nonattenuation creep due to the level of the strengthening and weakening effects change in different stages. As the confining pressure increases, the test specimens only exhibit an attenuation creep because of the enhancing strengthening effect. Both the hardening parameter and the damage variable were introduced to describe the strengthening and weakening effects, respectively, and a new creep constitutive model for frozen soil considering these effects was put forward based on the theory of elastoviscoplastic and the fractional derivative. Finally, the model parameters were analyzed and their determination method was also provided to reveal the trend of parameters according to the triaxial test results. The calculated results of the constitutive model show that the proposed model can describe the whole creep process of frozen soil well. |
| format | Article |
| id | doaj-art-91fb7b24e6bb487b874caf747379b8af |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2016-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-91fb7b24e6bb487b874caf747379b8af2025-02-03T05:58:26ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422016-01-01201610.1155/2016/57402925740292A Fractional Creep Constitutive Model for Frozen Soil in Consideration of the Strengthening and Weakening EffectsFeng Hou0Quanming Li1Enlong Liu2Cheng Zhou3Mengke Liao4Huiwu Luo5Xingyan Liu6State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, ChinaChina Academy of Safety Science and Technology, Beijing 10012, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, ChinaState Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Institute, Chinese Academy of Sciences, Lanzhou 730000, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, ChinaState Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Institute, Chinese Academy of Sciences, Lanzhou 730000, ChinaThe triaxial creep tests of frozen silty clay mixed with sands were performed under different pressures, and the test results demonstrated that, under the low confining pressure, when the shear stress is lower than the long-term strength, the test specimen exhibits an attenuation creep because the strengthening effect is greater than the weakening effect. When the shear stress is higher than the long-term strength, the test specimen exhibits a nonattenuation creep due to the level of the strengthening and weakening effects change in different stages. As the confining pressure increases, the test specimens only exhibit an attenuation creep because of the enhancing strengthening effect. Both the hardening parameter and the damage variable were introduced to describe the strengthening and weakening effects, respectively, and a new creep constitutive model for frozen soil considering these effects was put forward based on the theory of elastoviscoplastic and the fractional derivative. Finally, the model parameters were analyzed and their determination method was also provided to reveal the trend of parameters according to the triaxial test results. The calculated results of the constitutive model show that the proposed model can describe the whole creep process of frozen soil well.http://dx.doi.org/10.1155/2016/5740292 |
| spellingShingle | Feng Hou Quanming Li Enlong Liu Cheng Zhou Mengke Liao Huiwu Luo Xingyan Liu A Fractional Creep Constitutive Model for Frozen Soil in Consideration of the Strengthening and Weakening Effects Advances in Materials Science and Engineering |
| title | A Fractional Creep Constitutive Model for Frozen Soil in Consideration of the Strengthening and Weakening Effects |
| title_full | A Fractional Creep Constitutive Model for Frozen Soil in Consideration of the Strengthening and Weakening Effects |
| title_fullStr | A Fractional Creep Constitutive Model for Frozen Soil in Consideration of the Strengthening and Weakening Effects |
| title_full_unstemmed | A Fractional Creep Constitutive Model for Frozen Soil in Consideration of the Strengthening and Weakening Effects |
| title_short | A Fractional Creep Constitutive Model for Frozen Soil in Consideration of the Strengthening and Weakening Effects |
| title_sort | fractional creep constitutive model for frozen soil in consideration of the strengthening and weakening effects |
| url | http://dx.doi.org/10.1155/2016/5740292 |
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