Macroscopic Mechanical Properties and Microstructure Characteristics of Solid Waste Base Capillary Retarded Field Covering Material
文献类型：期刊论文
| 作者 | He, Yifan1,2; Lu, Haijun1,2; Lan, Jirong3; Ma, Jiayu1; Liu, Mengyi1; Dong, Yiqie1 |
| 刊名 | BUILDINGS
 |
| 出版日期 | 2024-02-01 |
| 卷号 | 14期号:2页码:17 |
| 关键词 | landfill sealing materials capillary blocking effect water-holding power permeability coefficient microstructure |
| DOI | 10.3390/buildings14020313 |
| 英文摘要 | In the practical operation of traditional landfills, compaction clay often experiences cracking, while the HDPE geomembrane may tear and bulge, resulting in a compromised performance of the landfill covering system. To address this issue, a capillary retarding covering material for landfill sites is proposed by utilizing municipal sludge and construction waste particles as substrates and incorporating a small quantity of calcium bentonite. The mechanical characteristics of the covering material were investigated using a standard consolidation test and a triaxial compression test. A permeability test and a soil water characteristic curve (SWCC) test were conducted to examine the permeability and capillary retarding effect of the covering material. Microscopic tests including SEM scanning, laser particle size analysis, and T2 NMR analysis were performed to investigate the connection mode, particle size composition, and pore structure characteristics of the covered particles. Based on the aforementioned research, the following conclusions can be drawn: The cohesion of the covering material ranged from 50 to 150 kPa, while the internal friction angle ranged from 24.23 degrees to 31 degrees. The cohesion was directly proportional to the content of construction waste, whereas the internal friction angle was inversely proportional to calcium bentonite content. The permeability coefficient ranged from 5.04 x 10-6 cm/s to 7.34 x 10-5 cm/s, indicating a certain level of impermeability. Both the sludge and the calcium bentonite contents jointly influenced the final permeability coefficient in a negative correlation manner, with a notable hydraulic hysteresis phenomenon observed. A higher content of construction waste leads to a more pronounced supporting force exerted by the formed skeleton structures within a load pressure range between 0 and 1600 kPa. When considering a mass ratio of municipal sludge: construction waste: calcium bentonite as 30:60:7, respectively, only a decrease in the pore ratio by approximately 13.20% was observed. This study provides valuable data support for designing and applying capillary retarding cover barrier systems in landfills. |
| 资助项目 | National Natural Science Foundation of China |
| WOS研究方向 | Construction & Building Technology ; Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001172119400001 |
| 出版者 | MDPI |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/40753]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Dong, Yiqie |
| 作者单位 | 1.Wuhan Polytech Univ, Sch Civil Engn & Architecture, Wuhan 430023, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 3.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China |
| 推荐引用方式 GB/T 7714 | He, Yifan,Lu, Haijun,Lan, Jirong,et al. Macroscopic Mechanical Properties and Microstructure Characteristics of Solid Waste Base Capillary Retarded Field Covering Material[J]. BUILDINGS,2024,14(2):17. |
| APA | He, Yifan,Lu, Haijun,Lan, Jirong,Ma, Jiayu,Liu, Mengyi,&Dong, Yiqie.(2024).Macroscopic Mechanical Properties and Microstructure Characteristics of Solid Waste Base Capillary Retarded Field Covering Material.BUILDINGS,14(2),17. |
| MLA | He, Yifan,et al."Macroscopic Mechanical Properties and Microstructure Characteristics of Solid Waste Base Capillary Retarded Field Covering Material".BUILDINGS 14.2(2024):17. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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