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

Tophoff, Lukas; Finklenburg, Berit; Schriewer, Eva-Lotte; Schüttrumpf, Holger; Heimbecher, Frank

doi:10.1016/j.geotexmem.2024.01.002

Geotextiles and Geomembranes

2024

DOI: 10.1016/j.geotexmem.2024.01.002

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

Lukas Tophoff,

Berit Finklenburg,

Eva-Lotte Schriewer

et al.

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2024

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Cited by 2 publications

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Geotextile filtration characteristics in piping rescue under extreme soil-retained state

Feng,

Jiang,

Liu

2024

Geosynthetics International

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Geotextiles have significant potential in rescuing backward erosion piping (BEP) occurred in levees. To investigate the filtration characteristics of woven geotextile for BEP prevention under the extreme soil-retention state, laboratory experiments were conducted using woven geotextiles with different pore sizes. The extreme soil-retention characteristics of the geotextile were analyzed, and the optimal relationship between filter pore size and particle size of the protected soil was explored. Additionally, the impact of fine particle content of the protected soil on the filter’s filtration performance was studied. The results indicated that, for the medium sand and silty sand tested, the filter still met soil retention requirements when the ratio of the geotextile’s equivalent pore size (O95) to the protected soil’s characteristic particle size (d85) was 5.2 and 4.3, respectively. With the increase of filter pore size, the clogging degree of filter showed a trend of rapid decrease followed by an increase, indicating that there was an optimal matching relationship between the filter aperture and the particle size of protected soil. When woven geotextiles are used for preventing BEP, to ensure optimal filtration performance of the filter, the recommended values for O95/d85 in medium sand and silty sand are 5.2 and 3.3, respectively.

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Geotextile filtration characteristics in piping rescue under extreme soil-retained state

Feng,

Jiang,

Liu

2024

Geosynthetics International

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Field Investigations and Service Life Assessment of Geosynthetic Filters in Tidally Influenced Revetments in Cases of Ochre Clogging

Tophoff,

Schüttrumpf,

Heimbecher

et al. 2024

Water

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In recent decades, there have been individual cases of damage to the revetments of the German North Sea estuaries due to clogging by precipitated ochre products. This process is defined as ochre clogging and has been extensively explained in the literature. The primary aim of the investigations was to better understand the clogging process under in situ conditions and the causative environmental conditions surrounding the filters. Extensive in situ investigations were therefore carried out. It was found that a permeability reduction in geotextile filters can be strongly accelerated by ochre clogging, which appears to be a biogeochemical process. This describes a combined action of the chemical precipitation of iron and manganese, precipitation by microorganisms, and physical clogging. A further aim of this study was to establish limit values for the decisive ochre clogging parameters, which could be used to quantify the susceptibility to ochre clogging. It was shown that the determination of the iron and manganese content of the groundwater, as well as the redox capacity of the groundwater, is sufficient to assess the tendency for ochre clogging. To minimise the negative impact on filter performance, recommendations for an adapted filter design have been developed as a guide for planners.

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

Cited by 2 publications

References 13 publications

Geotextile filtration characteristics in piping rescue under extreme soil-retained state

Geotextile filtration characteristics in piping rescue under extreme soil-retained state

Field Investigations and Service Life Assessment of Geosynthetic Filters in Tidally Influenced Revetments in Cases of Ochre Clogging

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