Compressibility of natural soils subjected to long-term acidic contamination

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Title Compressibility of natural soils subjected to long-term acidic contamination
Author Gratchev, Ivan; Towhata, Ikuo
Journal Name Environmental Earth Sciences
Year Published 2011
Place of publication Germany
Publisher Springer
Abstract This paper presents the results of a systematic analysis aimed at establishing whether acidic pore fluids can affect the properties of natural soils, in particular their compressibility. Marine deposits with different mineral compositions and undisturbed soil structure were collected for this research from three coastal areas in Japan. Pleistocene clays from the Osaka and Ariake Bays were obtained from boreholes at a depth of more than 10 m, whereas the Kawasaki mud, a relatively young deposit of Holocene, was dredged from the bed of the Tokyo Bay. Soil specimens were placed in special containers, which were designed to reproduce the process of long-term soil– water–chemical interaction, and leached with solutions of sulfuric acid for different periods of time, ranging from 1 to 9 months. At the end of each time interval, standard compression tests were performed to study the behavior of soil in an acidic environment. It was found that clay mineralogy and soil structure had a significant effect on the compressibility of clays at low pH. In the case of the Osaka and Ariake clays, the compressibility significantly increased with a decrease in pH values, a finding that was primarily attributed to changes in the soil’s structure. In contrast, the effect of acidic leaching on the properties of Kawasaki mud was observed to be the opposite. Laboratory data showed that in acidic medium the compressibility of soil decreased presumably due to the collapse of the diffuse double layer.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1007/s12665-010-0838-2
Copyright Statement Copyright 2010 Springer Berlin / Heidelberg. This is an electronic version of an article published in Environmental Earth Sciences, Volume 64, Number 1, 193-200. Environmental Earth Sciences is available online at: http://www.springerlink.com/ with the open URL of your article.
Volume 64
Issue Number 1
Page from 193
Page to 200
ISSN 1866-6280
Date Accessioned 2011-01-25
Date Available 2013-05-29T09:19:25Z
Language en_US
Research Centre Centre for Infrastructure Engineering and Management
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Civil Engineering
URI http://hdl.handle.net/10072/37645
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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