Behavior and influence of desiccation cracking in loess landfill covers

2017 3rd International Conference on Energy, Environment and Materials Science

能源学;生态环境科学;材料科学

Wu, Tao^1 ; Lan, Ji-Wu^1 ; Qiu, Qing-Wen^1 ; He, Hai-Jie^1 ; Li, He^1

MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Department of Civil Engineering, Zhejiang University, Hangzhou

310058, China^1

关键词: Cover materials;    Desiccation cracks;    Full-scale testing;    Intersection angles;    Local landfills;    Methane emissions;    Northwest regions;    Preferential flows;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/94/1/012084/pdf
DOI  :  10.1088/1755-1315/94/1/012084

来源: IOP

【 摘 要 】

In the northwest region of China, loess was the main closure cover material of local landfills. Tests in a full-scale testing facility were conducted to investigate the behavior and influence of desiccation cracking in loess landfill covers. The desiccation cracks in the loess landfill cover intersected with T-shape, and the intersection angles were close to 90 degrees. The desiccation cracks formed as a result of drying, and would heal with the increase of moisture content of the loess. In addition, desiccation cracking in loess covers would promote the formation of preferential flow channels. As a consequence, the gas permeability of the loess cover was improved, and methane emissions increased obviously.