气候变化增加了极端天气事件的频率，从而加剧了浅层流动型滑坡、山区土壤侵蚀以及沿海地区的边坡失稳。植被和生物高分子材料已被用于生态边坡防护，但这些方法常面临生长周期较长、加固效果不稳定等局限性。本研究探讨了丝状真菌与小麦麸皮在加固松散砂土方面的潜力。通过三轴剪切试验、崩解试验以及渗滤液分析，评估真菌处理砂土的力学性能、耐久性及环境安全性。结果表明，菌丝体能增强土壤强度，减少变形，并降低超孔隙水压力，且在不排水条件下的加固效果更为显著。菌丝附着于颗粒表面，形成持久的粘结，提升了土体黏聚力，并改变了临界状态线的斜率，显著增强了真菌处理砂土的力学稳定性。其加固后所得强度参数可与植物根系加固土体相媲美。三轴剪切试验后，真菌处理砂土在水中浸泡14天仍保持稳定，渗滤液中未检测到环境风险。这些发现表明，真菌菌丝体是一种有效且环保的松散砂土加固手段，可用于减缓浅层滑坡并增强海岸线稳定性。Fig. 1. Materials and procedure for sample preparation.Fig. 2. Schematic of apparatus for soil disintegration test.Fig. 3. Triaxial test data of treated sample: (a) deviatoric stress-axial strain curves in drained tests; (b) volumetric strain-axial stain curves in drained tests; (c) deviatoric stress-axial strain curves in undrained tests; (d) excess pore water pressure ratio-axial strain curves in undrained tests; (e) comparison of relative breakage index.Fig. 4. Comparison of triaxial test data between treated sample and untreated sample: (a) deviatoric stress-axial strain curves in drained tests; (b) volumetric strain-axial stain curves in drained tests; (c) excess pore water pressure ratio-axial strain curves in undrained tests; (d) effective stress paths; (e) failure mode for untreated sample; (f) failure mode for treated sample.Fig. 5. Variations of the peak deviatoric stress and elastic modulus with wheat bran content under drained and undrained conditions.Fig. 6. Stress path of fungus-treated sand under: (a) drained condition; (b) undrained condition.Fig. 7. Variations of the: (a) internal friction angle; (b) cohesion with wheat bran content; (c) comparison of strength parameters between fungus-treated sand and conventional reinforcement materials.Fig. 8. Typical photographs of the disintegration process for fungus-treated sand (a) treated sand; (b) treated sand after triaxial shear test; (c) untreated sand.Fig. 9. Scanning electron microscope imaging of fungus-treated sand. ColumnFig. 10. Morphological characterization of fungus-treated sand: (a) surface porosity; (b) pore circularity; (c) relative frequency of aggregate inclination distribution点击阅读原文可跳转至文章链接
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