Biological mechanisms of piping erosion reduction of organic soils

Benjamin T. Adams, Ming Xiao, Alice Wright

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The purpose of this study is to develop an understanding of the biological mechanisms governing piping erosion resistance in organic soils. Our previous investigations demonstrated the ability of organic soils such as peat and compost to effectively decrease piping erosion progression when mixed with otherwise highly erodible silty sands. However, degradation of important geomechanical properties after the addition of the organic soils limits the applicability of this bioabatement method. To better understand the processes of the erosion reduction and the geomechanical detriments, two additional phases of research are performed. First, the possible influence of the unique shape and texture of the botanically derived organic constituents is eliminated in order to more precisely focus on the biological aspects. Results substantiate the hypothesis that the presence of extracellular polymeric substances (EPS) can affect piping erosion behavior. The second phase further investigates this hypothesis by quantifying total biomass and two EPSs, polysaccharides and a glycoprotein called glomalin, in various organic and nonorganic soils. Results of the analyses indicate positive correlations between the presence of both EPSs, total microbial populations, and erosion reduction. The presence of both microbially and synthetically derived polysaccharides contribute to a reduction in piping erosion progression.

Original languageEnglish (US)
Title of host publicationGeoCongress 2012
Subtitle of host publicationState of the Art and Practice in Geotechnical Engineering
Pages701-709
Number of pages9
Edition225 GSP
DOIs
Publication statusPublished - Dec 1 2012
EventGeoCongress 2012: State of the Art and Practice in Geotechnical Engineering - Oakland, CA, United States
Duration: Mar 25 2012Mar 29 2012

Publication series

NameGeotechnical Special Publication
Number225 GSP
ISSN (Print)0895-0563

Other

OtherGeoCongress 2012: State of the Art and Practice in Geotechnical Engineering
CountryUnited States
CityOakland, CA
Period3/25/123/29/12

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All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

Cite this

Adams, B. T., Xiao, M., & Wright, A. (2012). Biological mechanisms of piping erosion reduction of organic soils. In GeoCongress 2012: State of the Art and Practice in Geotechnical Engineering (225 GSP ed., pp. 701-709). (Geotechnical Special Publication; No. 225 GSP). https://doi.org/10.1061/9780784412121.073