氣候變化增加了極端天氣事件的頻率，從而加劇了淺層流動型滑坡、山區(qū)土壤侵蝕以及沿海地區(qū)的邊坡失穩(wěn)。植被和生物高分子材料已被用于生態(tài)邊坡防護(hù)，但這些方法常面臨生長周期較長、加固效果不穩(wěn)定等局限性。本研究探討了絲狀真菌與小麥麩皮在加固松散砂土方面的潛力。通過三軸剪切試驗、崩解試驗以及滲濾液分析，評估真菌處理砂土的力學(xué)性能、耐久性及環(huán)境安全性。結(jié)果表明，菌絲體能增強土壤強度，減少變形，并降低超孔隙水壓力，且在不排水條件下的加固效果更為顯著。菌絲附著于顆粒表面，形成持久的粘結(jié)，提升了土體黏聚力，并改變了臨界狀態(tài)線的斜率，顯著增強了真菌處理砂土的力學(xué)穩(wěn)定性。其加固后所得強度參數(shù)可與植物根系加固土體相媲美。三軸剪切試驗后，真菌處理砂土在水中浸泡14天仍保持穩(wěn)定，滲濾液中未檢測到環(huán)境風(fēng)險。這些發(fā)現(xiàn)表明，真菌菌絲體是一種有效且環(huán)保的松散砂土加固手段，可用于減緩淺層滑坡并增強海岸線穩(wěn)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點擊閱讀原文可跳轉(zhuǎn)至文章鏈接
成功提示
錯誤提示
警告提示
評論 （0）