A new state-dependent constitutive model for cyclic thermo-mechanical behaviour of unsaturated vegetated soil
文献类型：期刊论文
| 作者 | Ng, C. W. W.1; Zhang, Q.1; Zhang, S.1; Lau, S. Y.1; Guo, H.1,2,3; Li, Z.1 |
| 刊名 | CANADIAN GEOTECHNICAL JOURNAL
 |
| 出版日期 | 2024-06-26 |
| 页码 | 25 |
| 关键词 | thermo-mechanical unsaturated vegetated soil cyclic state-dependent dilatancy constitutive relationship |
| ISSN号 | 0008-3674 |
| DOI | 10.1139/cgj-2023-0268 |
| 通讯作者 | Zhang, Q.(qzhangbp@connect.ust.hk) |
| 英文摘要 | Climate change has resulted in increasing attention being paid to the effects of temperature and humidity on vegetated soil. However, existing constitutive models rarely investigate the thermo-mechanical behaviour, such as the accumulation of plastic strain under non -isothermal conditions, of unsaturated vegetated soil. To address this issue, this study developed a comprehensive constitutive model by adopting state -dependent dilatancy in conjugation with loading, memory, and bounding surfaces. Moreover, root -induced hardening due to pore occupancy and internal bonding is modelled with dependence on the root volume ratio. The performance of this newly developed constitutive model is then evaluated using previous laboratory element tests. Comparisons between the computed and measured results reveal that the model is capable of capturing variations in soil state at a range of temperatures, suctions, and root volume ratios. The shearing behaviour of vegetated soil, especially its volumetric response, is well predicted by the model, as confirmed by comparing it with triaxial compression test results. Moreover, the model predicts that the accumulated volumetric strain of unsaturated vegetated soil (0.2%) is significantly less than saturated bare soil (1.1%) after four thermal cycles. These computed results imply that vegetation can mitigate the effects of climate change on soil through both transpiration -induced suction and mechanical reinforcement. |
| WOS关键词 | VOLUME CHANGE BEHAVIOR ; BOUNDING SURFACE PLASTICITY ; HYDRO-MECHANICAL BEHAVIOR ; SHEAR-STRENGTH ; ELASTOPLASTIC MODEL ; EFFECTIVE STRESS ; SATURATED CLAYS ; COMPRESSIBILITY ; TEMPERATURE ; SUCTION |
| 资助项目 | National Natural Science Foundation of China[U20A20320] ; Area of Excellence project[AoE/E-603/18] ; RGC of the HKSAR |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001254899500001 |
| 出版者 | CANADIAN SCIENCE PUBLISHING |
| 资助机构 | National Natural Science Foundation of China ; Area of Excellence project ; RGC of the HKSAR |
| 源URL | [http://ir.giec.ac.cn/handle/344007/42212]  |
| 专题 | 中国科学院广州能源研究所 |
| 通讯作者 | Zhang, Q. |
| 作者单位 | 1.Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Hong Kong, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China 3.Univ Sci & Technol China, Sch Energy Sci & Engn, Guangzhou 510640, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ng, C. W. W.,Zhang, Q.,Zhang, S.,et al. A new state-dependent constitutive model for cyclic thermo-mechanical behaviour of unsaturated vegetated soil[J]. CANADIAN GEOTECHNICAL JOURNAL,2024:25. |
| APA | Ng, C. W. W.,Zhang, Q.,Zhang, S.,Lau, S. Y.,Guo, H.,&Li, Z..(2024).A new state-dependent constitutive model for cyclic thermo-mechanical behaviour of unsaturated vegetated soil.CANADIAN GEOTECHNICAL JOURNAL,25. |
| MLA | Ng, C. W. W.,et al."A new state-dependent constitutive model for cyclic thermo-mechanical behaviour of unsaturated vegetated soil".CANADIAN GEOTECHNICAL JOURNAL (2024):25. |
入库方式： OAI收割
来源：广州能源研究所
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