The effect of physical-chemical combined clogging on the area density and permeability of geotextile envelopes for subsurface drainage systems in arid regions
文献类型： 外文期刊
作者： Qin, Shuai 1 ; Guo, Chenyao 1 ; Wu, Jingwei 1 ; He, Shuai 2 ; Yang, Haoyu 1 ; Yao, Chenzhi 1 ; Jiang, Xinman 1 ; Li, Hang 1 ;
作者机构： 1.Wuhan Univ, State Key Lab Water Resources Engn & Management, Wuhan 430072, Hubei, Peoples R China
2.Xinjiang Acad Agr & Reclamat Sci, Shihezi 832000, Peoples R China
关键词： Subsurface drainage; Geotextile envelope; Physical-chemical combined clogging; Arid region
期刊名称：GEOTEXTILES AND GEOMEMBRANES （ 影响因子：6.2； 五年影响因子：6.8 ）
ISSN： 0266-1144
年卷期： 2025 年 53 卷 6 期
页码：
收录情况： SCI
摘要： This study investigates the morphological characteristics, development process, and impact on permeability of physical-chemical combined clogging on geotextile envelopes, through laboratory experiments involving particle flow coupled with chemical precipitation. The results show that there is a synergistic effect between physical clogging caused by soil particle accumulation and chemical clogging due to salt precipitation. Chemical precipitation exacerbates physical clogging, while physical clogging promotes the formation of chemical precipitation. The chemical precipitates on the upstream of the geotextile envelope binds the particles to each other and to the fibers of the geotextile envelope, while on the downstream, precipitates tends to encapsulate the fibers, with less physical clogging. After combined clogging, the permeability coefficient of the geotextile envelope decreases rapidly with the increasing of the clogging material, and then decreases slowly. When the area density of the clogging material is less than 91.02 g/m2, it shows a linear decrease, and then followed by a logarithmic decrease. Physical-chemical combined clogging is more severe than single physical or chemical clogging. After the permeability stabilizes, for the same clogging mass, the decrease in permeability caused by combined clogging is 1.2 times and 2 times greater than that caused by physical and chemical clogging, respectively.
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