[666] - Application of electro-osmosis to reduce the adhesion of clay during mechanical tunnel driving

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Spagnoli, G., Klitzsch, N., Fernandez-Steeger, T., Stanjek, H., Real Rey, A., Feinendegen, M., Azzam, R., 2011. Application of electro-osmosis to reduce the adhesion of clay during mechanical tunnel driving. Environmental & Engineering Geoscience, 17 (4), 417 - 426. DOI: 10.2113/gseegeosci.17.4.417.
Title(s):Main Title: Application of electro-osmosis to reduce the adhesion of clay during mechanical tunnel driving
Description(s):Abstract: In geotechnical engineering, the clogging of clay soils can lead to serious problems. For example, during mechanical tunnel driving with tunnel boring machines, the problem of clogging is due to the excavated material, which sticks to the metallic parts of the machine, requiring cleaning, which in turn causes delays and financial losses. This article suggests a method to reduce adhesion of the excavated material on a steel surface by means of electro-osmosis. The adhesion of different clay types to a metal surface was studied in tilted plate tests. Three different clay samples were compacted and cut into slices with a thickness of 1 cm. Afterwards, both a direct current (DC) and pulsating DC, which consisted of the positive half-cycle only, were applied to the samples in order to study the influence of electro-osmosis on adhesion. The application of electrical fields caused the detachment of the clays from the metal surface by slight shear forces. It is not currently possible to determine the influence of the pulsating DC or DC on the detachment behavior of the clays because of the complexity of the system. However, the use of the pulsating DC results in a lower electrical contact impedance. The reduced pulsating DC contact impedance results in higher electrical currents (for the same applied potential difference) and thus a higher electro-osmotic efficiency (i.e., the energy needed to detach a clay from a metal surface by electro-osmosis is significantly lower for pulsating DC than for DC). The sample and contact impedances were determined by electrical impedance spectroscopy measurements.
Identifier(s):DOI: 10.2113/gseegeosci.17.4.417
Responsible Party
Creator(s):Author: Giovanni Spagnoli
Author: Norbert Klitzsch
Author: Tomas Fernandez-Steeger
Author: Helge Stanjek
Author: Alvaro Real Rey
Author: Martin Feinendegen
Author: Rafig Azzam
Publisher:Association of Environmental & Engineering Geologists
TR32 Topic:Soil
Subject(s):CRC/TR32 Keywords: Electro-Osmosis, Tunnel Boring Machines, Clogging
File Details
File Name:2011_Spagnoli_EEG.pdf
Data Type:Text
Size(s):10 Pages
File Size:1580 kB (1.543 MB)
Date(s):Issued: 2011-11-01
Mime Type:application/pdf
Data Format:PDF
Download Permission:OnlyTR32
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:TR32DB Data policy agreement
North:-no map data
Measurement Region:Other
Measurement Location:--Other--
Specific Informations - Publication
Article Type:Journal
Source:Environmental & Engineering Geoscience
Number Of Pages:10
Page Range:417 - 426
Metadata Details
Metadata Creator:Oliver Mohnke
Metadata Created:2013-12-02
Metadata Last Updated:2013-12-02
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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