菌丝–砂复合轻质土的静力强度特性研究

doi:10.13722/j.cnki.jrme.2024.0105

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摘要聚苯乙烯颗粒或废弃轮胎与砂土混合得到的轻质土工材料被广泛应用于岩土工程，但其轻质填充材料会对环境产生危害。近年来，以农业废弃物麦麸为轻质材料、砂土为骨料、Pleurotus ostreatus菌丝为胶结材料组成的菌丝–砂复合轻质土(P. ostreatus MBLS)，因其质量轻、无污染等优势受到了广泛的关注。对P. ostreatus MBLS进行静力三轴排水剪切，研究不同基质含量、有效围压以及菌丝对MBLS的强度特性的影响。试验发现基质材料的增加会降低P. ostreatus MBLS的密度和抗剪强度。菌丝的加入提升了试样的抗剪强度，限制试样的体变，使得P. ostreatus MBLS表现出一定的结构性，但提升程度存与有效围压大小有关。菌丝对试样强度与变形的作用在低围压条件下(约100 kPa)和小应变阶段更显著。P. ostreatus MBLS的制备方法简单且无环境污染风险，是浅层回填土工材料的潜在替代物，为岩土工程的低碳化建设提供理论指导与技术支持。

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	苟乐宇1
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关键词 ：土力学, 轻质土, 菌丝, 三轴剪切试验, 强度, 结构性

Abstract：Lightweight geomaterials obtained by mixing expanded polystyrene(EPS) or waste tires(WTS) with soil are widely used in geotechnical engineering，but lightweight materials(such as EPS) can be harmful to the environment. In recent years，the mycelium bio-composites lightweight soil(P. ostreatus MBLS)，which is composed of wheat bran(lightweight material or substrate material)，sand(aggregate)，and Pleurotus ostreatus(cementing material)，has attracted wide attention due to the advantages of its lightweight and non-pollution. In this paper，a series of static drained triaxial compression tests were performed. The impact of substrate material content，effective confining pressures，and hyphae on the mechanical properties of P. ostreatus MBLS was studied. It is found that increasing substrate material content reduces the strength and density of P. ostreatus MBLS. The presence of mycelium changes the structure of P. ostreatus MBLS，improves strength and reduces volumetric contraction，depending on effective confining pressure. The effect of mycelium on the strength and deformation of the specimens is more significant at low confining pressures(about 100 kPa) and at small strain stages. The preparation method of P. ostreatus MBLS is straightforward and poses no environmental pollution risks. It represents a promising alternative to conventional shallow backfill geotechnical materials.

Key words： soil mechanics lightweight soil mycelium triaxial shear test strength structural characteristic

引用本文:

苟乐宇1，2，李飒1，张先伟2 . 菌丝–砂复合轻质土的静力强度特性研究[J]. 岩石力学与工程学报, 2024, 43(10): 2590-2598.
GOU Leyu1，2，LI Sa1，ZHANG Xianwei2. Study on static strength of mycelium bio-composites lightweight soil. , 2024, 43(10): 2590-2598.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2024.0105 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I10/2590

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