Preliminary observations of the shear behaviour of fungal treated soil
Preliminary observations of the shear behaviour of fungal treated soil
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DOI：
10.1051/e3sconf/20199211017
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发表时间：
2019-06
影响因子：
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通讯作者：
E. Salifu;Grainne El Mountassir-
中科院分区：
文献类型：
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作者：
E. Salifu;Grainne El Mountassir-
本文介绍了一种全新的技术，涉及使用真菌菌丝的地面改良的调查结果。已知真菌菌丝（长丝状分支）有助于土壤聚集和土壤疏水性，并假设也影响土壤的水力机械行为。我们在这里提出的初步观察的机械行为的砂处理的真菌种Pleoprostreatus（P. ostreatus）。在含有不同百分比的有机基质（真菌生长的营养源）并用糙皮侧耳处理的沙子上进行直接剪切试验。研究了真菌处理和未处理土壤的应力-应变特性。结果表明，无论有机物的百分比，真菌处理的标本往往会显示未处理的对照标本的峰值行为特征的损失和相关的过渡到一个更收缩的体积响应。迄今为止进行的有限的实验似乎表明，处理和未处理的标本之间的行为差异的主要因素是由于润滑的谷物的真菌菌丝和渗出物。需要进一步的调查，以充分阐明真菌处理的土壤的力学行为的影响机制。
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.