Potential biological and chemical clogging of piezometer filters in acid sulphate soil

Indraratna, B; Baral, P; Ameratunga, J; Kendaragama, B

Potential biological and chemical clogging of piezometer filters in acid sulphate soil

Indraratna, B

Baral, P Ameratunga, J Kendaragama, B

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Publisher:: Institution of Engineers Australia
Publication Type:: Journal Article
Citation:: Australian Geomechanics Journal, 2017, 52, (2), pp. 79-85
Issue Date:: 2017-06-01

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Field	Value	Language
dc.contributor.author	Indraratna, B https://orcid.org/0000-0002-9057-1514
dc.contributor.author	Baral, P
dc.contributor.author	Ameratunga, J
dc.contributor.author	Kendaragama, B
dc.date.accessioned	2022-09-01T05:00:46Z
dc.date.available	2022-09-01T05:00:46Z
dc.date.issued	2017-06-01
dc.identifier.citation	Australian Geomechanics Journal, 2017, 52, (2), pp. 79-85
dc.identifier.issn	0818-9110
dc.identifier.issn	0818-9110
dc.identifier.uri	http://hdl.handle.net/10453/161184
dc.description.abstract	Instrumentation for performance monitoring of an embankment built on soft soils is vital for assessing the progress of consolidation and confirming (or refuting) soil parameters used in design when there are significant design uncertainties and the monitoring data can be used to calibrate the design soil parameters. A suite of instruments including settlement plates, extensometers, piezometers, inclinometers is often employed for this purpose. In the first Author's experience, erroneous readings interpretations of pore water pressure (PWP) readings have been reported in various case studies involving transport infrastructure development and reclamations works both in Australia and South East Asia, especially in low-lying acid sulphate soil floodplains. It has been observed that in spite of the presence of vertical drains (PVDs), excess pore water pressure readings from vibrating wire piezometers (VWPs) do not always dissipate as fast as expected especially after a certain period of time, typically a year. The article discusses the potential factors affecting the reliability of VWPs including filter tip clogging, extreme smearing of soil adjoining the filter, gas generation or cavitation, chemical alteration or corrosion of the filter, electro-osmotic effects and cavitation due to bacterial activity. Based on this, the response of VWPs may be divided into a distinct trilinear trend, observed for much of the Australian northern and eastern coastal belt that is predominantly affected by Acid sulphate soil (ASS) conditions where oxidisable pyrite layers are present within relatively shallow depths of the upper Holocene clay.
dc.language	en
dc.publisher	Institution of Engineers Australia
dc.relation.ispartof	Australian Geomechanics Journal
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 0914 Resources Engineering and Extractive Metallurgy
dc.title	Potential biological and chemical clogging of piezometer filters in acid sulphate soil
dc.type	Journal Article
utslib.citation.volume	52
utslib.for	0905 Civil Engineering
utslib.for	0914 Resources Engineering and Extractive Metallurgy
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2022-09-01T05:00:44Z
pubs.issue	2
pubs.publication-status	Published
pubs.volume	52
utslib.citation.issue	2

Abstract:

Instrumentation for performance monitoring of an embankment built on soft soils is vital for assessing the progress of consolidation and confirming (or refuting) soil parameters used in design when there are significant design uncertainties and the monitoring data can be used to calibrate the design soil parameters. A suite of instruments including settlement plates, extensometers, piezometers, inclinometers is often employed for this purpose. In the first Author's experience, erroneous readings interpretations of pore water pressure (PWP) readings have been reported in various case studies involving transport infrastructure development and reclamations works both in Australia and South East Asia, especially in low-lying acid sulphate soil floodplains. It has been observed that in spite of the presence of vertical drains (PVDs), excess pore water pressure readings from vibrating wire piezometers (VWPs) do not always dissipate as fast as expected especially after a certain period of time, typically a year. The article discusses the potential factors affecting the reliability of VWPs including filter tip clogging, extreme smearing of soil adjoining the filter, gas generation or cavitation, chemical alteration or corrosion of the filter, electro-osmotic effects and cavitation due to bacterial activity. Based on this, the response of VWPs may be divided into a distinct trilinear trend, observed for much of the Australian northern and eastern coastal belt that is predominantly affected by Acid sulphate soil (ASS) conditions where oxidisable pyrite layers are present within relatively shallow depths of the upper Holocene clay.

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http://hdl.handle.net/10453/161184