Probabilistic analysis of a sustainable landfill cover considering stress-dependent water retention model and copula-based random fields
文献类型：期刊论文
| 作者 | Ng, Charles W. W.2; Qu, Chuanxiang2; Guo, Haowen2; Chen, Rui1; Xue, Qiang3
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| 刊名 | ENGINEERING GEOLOGY
 |
| 出版日期 | 2024-04-01 |
| 卷号 | 332页码:18 |
| 关键词 | Stress-dependent water retention Landfill cover Particle size Thickness Copula theory Random finite element method |
| ISSN号 | 0013-7952 |
| DOI | 10.1016/j.enggeo.2024.107460 |
| 英文摘要 | Material properties, crucial design parameters in landfill cover systems, can exhibit spatial variability due to nonuniform particle size and uneven compaction, affecting cover performance. Additionally, cover thickness, another key design parameter, can induce stress variation and influence soil-water retention capability. Previous designs always ignored these uncertainties and stress effects, potentially leading to unreasonable design schemes. This study aims to provide design recommendations for a three-layer landfill cover system under heavy rainfall, considering these factors simultaneously by the random finite element method (RFEM). The stress effects are captured using a stress-dependent soil-water retention curve (SDSWRC) and the hysteresis in the SDSWRC is considered in probabilistic analyses. For practical applications, uncertainties in two easily controllable particle size parameters, D10 and D60, are depicted by copula-based cross-correlated random fields. Based on empirical equations, the spatial variability of SDSWRC and water permeability function (WPF) can be further characterised by D10 and D60 random fields. It is found that considering SDSWRC and its spatial variability (e.g., shape) can overestimate percolation by at least 1.7 times compared to deterministic analysis using SWRC. The spatial variability of SDSWRC shape has a more significant impact than spatially variable saturated water permeability on cover system performance. Among candidate copulas, the CClayton copula (survival copula of Clayton copula) yields the most conservative results due to its upper tail dependence. The particle size and thickness of the bottom layer influence the cover system performance more than the upper two layers. A bottom layer with D10 <= 0.009 mm and D60/D10 >= 7.54, and thickness >= 0.8 m is recommended to achieve a satisfactory performance level with a 100-year design life. |
| 资助项目 | National Natural Science Foundation of China[U20A20320] ; Research Grants Council of HKSAR[AoE/E-603/18] ; Shenzhen Municipal Bureau of Urban Management and Law Enforcement[202305] |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001199467300001 |
| 出版者 | ELSEVIER |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/41061]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Qu, Chuanxiang |
| 作者单位 | 1.Harbin Inst Technol, Sch Civil & Environm Engn, Shenzhen, Peoples R China 2.Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Hong Kong, Peoples R China 3.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ng, Charles W. W.,Qu, Chuanxiang,Guo, Haowen,et al. Probabilistic analysis of a sustainable landfill cover considering stress-dependent water retention model and copula-based random fields[J]. ENGINEERING GEOLOGY,2024,332:18. |
| APA | Ng, Charles W. W.,Qu, Chuanxiang,Guo, Haowen,Chen, Rui,&Xue, Qiang.(2024).Probabilistic analysis of a sustainable landfill cover considering stress-dependent water retention model and copula-based random fields.ENGINEERING GEOLOGY,332,18. |
| MLA | Ng, Charles W. W.,et al."Probabilistic analysis of a sustainable landfill cover considering stress-dependent water retention model and copula-based random fields".ENGINEERING GEOLOGY 332(2024):18. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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