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Factors affecting geotextile filter long term behaviour and their relevance in design
No full textGeotextile and granular filters are widely used in civil (e.g. earth dams, embankments, drainage trenches, etc.) and environmental (e.g. landfills, permeable reactive barriers, etc.) engineering works. Geotextile filters are considered to be an effective alternative to conventional granular filters whose function is to prevent the movement of fine particles from the base soil allowing the liquid to flow as freely as possible. The design of a geotextile filter requires the knowledge of the base soil–filter interaction that is a very complex process due to the large number of factors involved.
In this paper, the complex cases of geotextile filter design in contact with internally unstable cohesionless soils and in critical/severe applications are analysed based on recent research also developed by the authors. Moreover, the influence of the main factors affecting geotextile/filter
long-term behaviour which are generally neglected in current design criteria, such as vertical effective stress, partial clogging, flow conditions, type of contact at the interface and type of permeant, are examined. Furthermore, various performance tests to evaluate the long-term soil–geotextile filter behaviour and the reliability and limits of different design criteria for cohesionless
soils are discussed
The use of a physically based model for susceptibility assessment of debris flow source areas
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Relevance of soil geotextile filter long term behaviour on the design of environmental and civil works.
No full textSoil/geotextile filter compatibility: a geometrical, experimental and micro-structural approach
Full text linkThe paper focuses on the evaluation of the long-term behaviour of geotextile filters in contact with cohesionless soils. The clogging, blinding and piping levels of the filtering systems have been evaluated analysing the results of long-term filtration tests, and of geometrical and microstructural analyses. The geometrical approach was based on the comparison between geotextile pore size distribution and soil grain size distribution, also taking into consideration the critical diameter of
suffusion. Scanning electron microscope images of geotextiles before and after filtration tests provided useful information about blinding and clogging phenomena and about variation of the geotextile internal structure (fibres and voids). Moreover, in order to predict the geotextile filtration opening size, an existing mathematical model was modified to take into account the variation of the geotextile final porosity due to the agglomeration of particles around geotextile fibres or within geotextile pores. The geometrical, experimental and micro-structural approach allowed the Authors to better evaluate the soil/ geotextile filter compatibility in the complex case of geotextile in contact with internally unstable soils. This procedure could be a useful tool in geotextile filter design under critical/severe conditions
Geotextile filter limit states: the affecting factors and their relevance in the design.
No full textThe use of physically based methods to locate the in-site surveys in areas prone to rapid landslides
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