Preliminary observations of the shear behaviour of fungal treated soil

Research output: Contribution to journalConference Contribution

Abstract

This paper presents results of an investigation into an entirely novel technique for ground improvement involving the use of fungal hyphae. Fungal hyphae (long filamentous branches) are known to contribute to soil aggregation and soil hydrophobicity, and are hypothesised to also influence the hydro-mechanical behaviour of soil. We present here preliminary observations of the mechanical behaviour of sands treated with the fungal species Pleurotus ostreatus (P. ostreatus). Direct shear tests were carried out on sand containing different percentages of organic substrate (the nutrient source for fungal growth) and treated with P. ostreatus. The stress-strain behaviour of fungal treated and untreated soil was investigated. Results show that irrespective of the percentage of organic matter, fungal treated specimens tended to show a loss in the peak behaviour characteristic of the untreated control specimens and an associated transition towards a more contractive volumetric response. The limited experiments conducted to date appear to indicate that the main factor responsible for the differences in behaviour between treated and untreated specimens is due to lubrication of the grains by the fungal hyphae and exudates. Further investigation is required to fully elucidate the mechanisms influencing the mechanical behaviour of fungal-treated soils.

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Soils
soil
Sand
ground improvement
sand
hydrophobicity
shear test
Hydrophobicity
Biological materials
Nutrients
Lubrication
Agglomeration
organic matter
substrate
nutrient
Substrates
experiment
Experiments

Keywords

  • ground improvement
  • fungal hyphae
  • soil aggregation
  • soil hydrophobicity

Cite this

@article{4549a47d3ad94e87850711dc256cd3fa,
title = "Preliminary observations of the shear behaviour of fungal treated soil",
abstract = "This paper presents results of an investigation into an entirely novel technique for ground improvement involving the use of fungal hyphae. Fungal hyphae (long filamentous branches) are known to contribute to soil aggregation and soil hydrophobicity, and are hypothesised to also influence the hydro-mechanical behaviour of soil. We present here preliminary observations of the mechanical behaviour of sands treated with the fungal species Pleurotus ostreatus (P. ostreatus). Direct shear tests were carried out on sand containing different percentages of organic substrate (the nutrient source for fungal growth) and treated with P. ostreatus. The stress-strain behaviour of fungal treated and untreated soil was investigated. Results show that irrespective of the percentage of organic matter, fungal treated specimens tended to show a loss in the peak behaviour characteristic of the untreated control specimens and an associated transition towards a more contractive volumetric response. The limited experiments conducted to date appear to indicate that the main factor responsible for the differences in behaviour between treated and untreated specimens is due to lubrication of the grains by the fungal hyphae and exudates. Further investigation is required to fully elucidate the mechanisms influencing the mechanical behaviour of fungal-treated soils.",
keywords = "ground improvement, fungal hyphae, soil aggregation, soil hydrophobicity",
author = "Emmanuel Salifu and {El Mountassir}, Gr{\'a}inne",
year = "2019",
month = "6",
day = "25",
doi = "10.1051/e3sconf/20199211017",
language = "English",
volume = "92",
journal = "E3S Web of Conferences",
issn = "2267-1242",

}

Preliminary observations of the shear behaviour of fungal treated soil. / Salifu, Emmanuel; El Mountassir, Gráinne.

In: E3S Web of Conferences, Vol. 92, 11017, 25.06.2019.

Research output: Contribution to journalConference Contribution

TY - JOUR

T1 - Preliminary observations of the shear behaviour of fungal treated soil

AU - Salifu, Emmanuel

AU - El Mountassir, Gráinne

PY - 2019/6/25

Y1 - 2019/6/25

N2 - This paper presents results of an investigation into an entirely novel technique for ground improvement involving the use of fungal hyphae. Fungal hyphae (long filamentous branches) are known to contribute to soil aggregation and soil hydrophobicity, and are hypothesised to also influence the hydro-mechanical behaviour of soil. We present here preliminary observations of the mechanical behaviour of sands treated with the fungal species Pleurotus ostreatus (P. ostreatus). Direct shear tests were carried out on sand containing different percentages of organic substrate (the nutrient source for fungal growth) and treated with P. ostreatus. The stress-strain behaviour of fungal treated and untreated soil was investigated. Results show that irrespective of the percentage of organic matter, fungal treated specimens tended to show a loss in the peak behaviour characteristic of the untreated control specimens and an associated transition towards a more contractive volumetric response. The limited experiments conducted to date appear to indicate that the main factor responsible for the differences in behaviour between treated and untreated specimens is due to lubrication of the grains by the fungal hyphae and exudates. Further investigation is required to fully elucidate the mechanisms influencing the mechanical behaviour of fungal-treated soils.

AB - This paper presents results of an investigation into an entirely novel technique for ground improvement involving the use of fungal hyphae. Fungal hyphae (long filamentous branches) are known to contribute to soil aggregation and soil hydrophobicity, and are hypothesised to also influence the hydro-mechanical behaviour of soil. We present here preliminary observations of the mechanical behaviour of sands treated with the fungal species Pleurotus ostreatus (P. ostreatus). Direct shear tests were carried out on sand containing different percentages of organic substrate (the nutrient source for fungal growth) and treated with P. ostreatus. The stress-strain behaviour of fungal treated and untreated soil was investigated. Results show that irrespective of the percentage of organic matter, fungal treated specimens tended to show a loss in the peak behaviour characteristic of the untreated control specimens and an associated transition towards a more contractive volumetric response. The limited experiments conducted to date appear to indicate that the main factor responsible for the differences in behaviour between treated and untreated specimens is due to lubrication of the grains by the fungal hyphae and exudates. Further investigation is required to fully elucidate the mechanisms influencing the mechanical behaviour of fungal-treated soils.

KW - ground improvement

KW - fungal hyphae

KW - soil aggregation

KW - soil hydrophobicity

U2 - 10.1051/e3sconf/20199211017

DO - 10.1051/e3sconf/20199211017

M3 - Conference Contribution

VL - 92

JO - E3S Web of Conferences

T2 - E3S Web of Conferences

JF - E3S Web of Conferences

SN - 2267-1242

M1 - 11017

ER -