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福建农林大学 资源与环境学院,福建 福州 350002
Received:08 July 2025,
Revised:2025-11-06,
Published:28 April 2026
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吕义豪, 许梦瑶, 杨茂进, 等.红壤中无定形氧化铁-高岭石胶结体系的结构和抗剪强度[J].水土保持通报,2026,46(2):14-22.
Lü Yihao, Xu Mengyao, Yang Maojin, et al. Structure and shear strength of amorphous iron oxide-kaolinite cementation system in red soil [J]. Bulletin of Soil and Water Conservation,2026,46(2):14-22.
吕义豪, 许梦瑶, 杨茂进, 等.红壤中无定形氧化铁-高岭石胶结体系的结构和抗剪强度[J].水土保持通报,2026,46(2):14-22. DOI: 10.13961/j.cnki.stbctb.2026.02.038. CSTR: 32312.14.stbctb.2026.02.038.
Lü Yihao, Xu Mengyao, Yang Maojin, et al. Structure and shear strength of amorphous iron oxide-kaolinite cementation system in red soil [J]. Bulletin of Soil and Water Conservation,2026,46(2):14-22. DOI: 10.13961/j.cnki.stbctb.2026.02.038. CSTR: 32312.14.stbctb.2026.02.038.
目的
2
从微观层面分析无定形氧化铁调控崩岗土体力学性能的关键机制,为崩岗侵蚀防治提供理论基础。
方法
2
以福建省典型崩岗区土壤中主要黏土矿物为研究对象,通过向高岭土中添加不同浓度无定形氧化铁(1,2,3,10 g/kg),并结合
X
射线衍射(XRD)、扫描电镜(SEM)及直剪试验,分析其对土体微观结构及抗剪强度参数的调控作用。
结果
2
XRD分析表明无定形氧化铁未与高岭土发生化学反应,主要通过物理包覆作用改变矿物特征。无定形氧化铁浓度对不同粒径胶结体的分布具有显著影响,其对2~250 μm粒径胶结体的形成具有显著调控作用;微观结构参数中,仅颗粒长轴和圆度发生显著变化,3 g/kg处理的样品颗粒长轴缩短了22%;2 g/kg处理的样品圆度降低了25%,其余参数的变异系数均小于15%。添加3 g/kg的处理在各围压水平下均表现出最高抗剪强度,试样抗剪强度的提升与微观结构的变化密切相关。3 g/kg处理组黏聚力提升最显著,较纯高岭土提高24.82%;而内摩擦角变动幅度小于5.30%。
结论
2
无定形氧化铁通过胶结包裹作用优化土壤结构,进而增强抗剪性能。
Objective
2
The key mechanisms by which amorphous iron oxide regulates the mechanical properties of Benggang soil were analyzed from a microscopic perspective in order to provide a theoretical basis for the prevention and control of Benggang erosion.
Methods
2
Kaolinite, the dominant clay mineral in soil from a typical Benggang area of Fujian Province, was selected as the research object. By incorporating amorphous iron oxide at different concentrations (1, 2, 3, and 10 g/kg) into kaolinite and utilizing
X
-ray diffraction (XRD), scanning electron microscopy (SEM), and direct shear tests, this study analyzed its regulatory effects on soil microstructure and shear strength parameters.
Results
2
XRD analysis revealed that amorphous iron oxide did not undergo a chemical reaction with kaolinite but primarily altered mineral characteristics through physical coating. The concentration of amorphous iron oxide significantly influenced the distribution of cemented aggregates across different particle sizes, demonstrating a pronounced regulatory role in the formation of aggregates within the 2—250 μm range. Among microstructural parameters, only particle long-axis and roundness exhibited significant changes. The long-axis decreased by 22% in samples with the 3 g/kg treatment, while roundness was reduced by 25% in samples with the 2 g/kg treatment. The coefficients of variation for all other parameters remained below 15%. The treatment with 3 g/kg consistently exhibited the highest shear strength across all confining pressure levels. The enhancement in shear strength was closely associated with the observed microstructural alterations. Further analysis indicated that the 3 g/kg treatment resulted in the most substantial improvement in cohesion, which increased by 24.82% compared to pure kaolinite. In contrast, the internal friction angle varied by less than 5.30%.
Conclusion
2
Amorphous iron oxide enhances soil shear strength by optimizing soil structure through cementation and encapsulation.
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