Assessment of the functionality of geotextile and granular filter systems in hydraulic engineering in case of iron ochre clogging tendency

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Lukas Tophoff , Berit Finklenburg , Eva-Lotte Schriewer , Holger Schüttrumpf , Frank Heimbecher
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Abstract

In recent decades, there have been individual cases of damage to geotextile filters due to clogging by flocculated ochre products. This process is defined as ochre clogging and has been extensively explained in recent theoretical studies (Tophoff et al., 2022). Several revetments of tidally influenced German North Sea estuaries have been damaged due to a severe reduction in the permeability of geotextiles. Therefore, experimental investigations of granular and geotextile filter constructions were carried out to better understand filter clogging. The investigations reproduce a revetment section at a scale of 1:1. For this purpose, the clogging process in the fluctuating water level or clogging zone was reproduced as a purely chemical iron precipitation. Ten short-term tests (10 h) and one long-term test (50 h) were carried out in total. The tests show that the process involves internal clogging and that the iron precipitates adhere immovably to the filter structure, reducing the pore space and permeability of the filter. This process is considered less problematic for granular filters. A reduction in permeability was measured in some cases for geotextile filter designs. Different geotextile material parameters appear to influence the iron ochre clogging tendency.

水利工程中土工织物和颗粒过滤系统在铁赭石堵塞趋势下的功能评估
近几十年来,土工织物过滤器因絮凝赭石产品堵塞而损坏的案例时有发生。这一过程被定义为赭石堵塞,并在最近的理论研究中得到了广泛解释(Tophoff 等人,2022 年)。由于土工织物的渗透性严重降低,德国北海河口受潮汐影响的几处护岸已经受损。因此,对颗粒和土工织物过滤结构进行了实验研究,以更好地了解过滤堵塞情况。调查以 1:1 的比例再现了护岸断面。为此,水位波动或堵塞区的堵塞过程被再现为纯粹的化学铁沉淀。共进行了十次短期试验(10 小时)和一次长期试验(50 小时)。试验结果表明,该过程涉及内部堵塞,铁沉淀物不可移动地附着在过滤器结构上,减少了过滤器的孔隙空间和渗透性。这一过程对颗粒过滤器来说问题较少。在某些情况下,土工织物过滤器设计的渗透性会降低。不同的土工织物材料参数似乎会影响铁赭石的堵塞趋势。
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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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