The effect of physical-chemical combined clogging on the area density and permeability of geotextile envelopes for subsurface drainage systems in arid regions

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Shuai Qin , Chenyao Guo , Jingwei Wu , Shuai He , Haoyu Yang , Chenzhi Yao , Xinman Jiang , Hang Li
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Abstract

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.
干旱区地下排水系统中物化复合堵塞对土工布围护层面积密度和渗透性的影响
本研究通过颗粒流耦合化学沉淀的室内实验,研究了土工布围护结构物理-化学复合堵塞的形态特征、发展过程及其对渗透性的影响。结果表明,土壤颗粒堆积引起的物理堵塞与盐降水引起的化学堵塞之间存在协同效应。化学沉淀加剧了物理堵塞,而物理堵塞促进了化学沉淀的形成。在土工布围护结构的上游,化学沉淀物使颗粒相互结合,并与纤维结合,而在下游,沉淀物倾向于包裹纤维,物理堵塞较少。复合堵塞后,随着堵塞材料的增加,土工布围护结构的渗透系数迅速下降,然后缓慢下降。当堵料的面积密度小于91.02 g/m2时,堵料面积密度先呈线性减小,然后呈对数减小。物理-化学复合堵塞比单一的物理或化学堵塞更为严重。在渗透率稳定后,对于相同堵塞质量,复合堵塞对渗透率的影响分别是物理堵塞和化学堵塞的1.2倍和2倍。
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来源期刊
Geotextiles and Geomembranes
Geotextiles and Geomembranes 地学-地球科学综合
CiteScore
9.50
自引率
21.20%
发文量
111
审稿时长
59 days
期刊介绍: The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.
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