游离氧化铁赋存形式对脱吸湿条件下红黏土热传导性能的影响

徐云山; 肖子龙; 孙德安; 李建平

doi:10.11779/CJGE20240058

游离氧化铁赋存形式对脱吸湿条件下红黏土热传导性能的影响 English Version

徐云山^{1, 2,},
肖子龙¹,
孙德安^2, ,,
李建平¹

1.
福建理工大学地下工程福建省高校重点实验室, 福建福州 350108
2.
上海大学土木工程系, 上海 200444

基金项目:

国家自然科学基金项目 42202295

国家自然科学基金项目 42207230

福建省自然科学基金项目 2021J05219

详细信息

作者简介:
徐云山(1990—)，男，博士，副教授，主要从事特殊土的工程特性与微观机制、非饱和土力学等方面的教学和科研工作。E-mail: xuyunshanfj@163.com

通讯作者:
孙德安, E-mail: sundean@shu.edu.cn

中图分类号: TU43
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出版历程
- 收稿日期: 2024-01-16
- 网络出版日期: 2024-08-20
- 刊出日期: 2025-03-31

Effects of occurrence form of free iron oxide on thermal conductivity of lateritic clay during drying and wetting conditions

1.
Key Laboratory of Underground Engineering of Fujian Provincial Universities, Fujian University of Technology, Fuzhou 350118, China
2.
Department of Civil Engineering, Shanghai University, Shanghai 200444, China

摘要

摘要: 游离氧化铁赋存形式对红黏土热传导性能的影响尚不清楚。利用热探针法对去除游离氧化铁前后原状和压实样的热传导性能进行测试，并结合红黏土在脱、吸湿条件下微观结构特征的演化，探讨了游离氧化铁和制样方式对其热传导性能的影响机制。热传导性能试验结果表明，相同含水率下压实红黏土的热传导系数小于原状样，平均约小4.8%。同条件下去铁后原状样的热传导系数比未去铁试样平均高约29.3%，去除游离氧化铁后原状样的热传导系数在含水率变化曲线上呈现滞回减弱现象。微观试验结果表明，去铁后原状试样的孔隙数量明显少于未去铁试样，未去铁原状样存在少量孔径约为10 μm的较大孔隙，去除游离氧化铁后原状样中较大的孔隙基本上消失。游离氧化铁对红黏土试样热传导性能的影响机制可理解为，游离氧化铁以“包膜”“桥接”和“附着”形式将土粒或团聚体集聚胶结起来，去铁后，部分较大团聚体分散为较小团聚体或土粒，充填土中较大孔隙，从而增加土颗粒间的接触与传热路径。
- 红黏土 /
- 游离氧化铁 /
- 赋存形式 /
- 热传导性能 /
- 土体微观结构
Abstract: The influences of occurrence form of free iron oxide (FIO) on the thermal conductivity of lateritic clay are still unclear. In this study, the thermal probe method is used to measure the thermal conductivity (TC) of undisturbed and compacted specimens before and after removing FIO. Combined with the evolution of microstructural characteristics, the influence mechanism of FIO and the specimen preparation method on TC is investigated. The thermal conductivity test results show that the TC of compacted specimens is lower than that of undisturbed specimens (US) under the same water content, with an average decrease of about 4.8%. After removing FIO, the TC of the US significantly increases, with an average increase of about 29.3%. Moreover, the hysteresis phenomenon between the TC and the volumetric water content of US after FIO removal is weakened. The microscopic test results show that the pore number in US after FIO removal is significantly less than that in untreated specimens. There are a small number of larger pores with a pore size of ~10 μm in US without FIO removal. The larger pores are basically eliminated in US after FIO removal. The mechanism by which FIO affects the TC of lateritic clay can be understood as: FIO can aggregate and bond soil particles or aggregates in the form of "encapsulation", "bridging", and "attachment". After removing FIO, some larger aggregates are dispersed into smaller aggregates or soil particles, which in turn fill the larger pores, increasing the contact and heat transfer paths between soil particles.
- lateritic clay /
- free iron oxide /
- occurrence form /
- thermal conductivity /
- soil microstructure

HTML全文

图 1 试样去铁过程示意图

Figure 1. Schematic diagram of the iron removal process of specimen

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图 2 试样热传导性能测试

Figure 2. Thermal conductivity tests on specimens

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图 3 原状与压实样脱吸湿路径下热传导系数随含水率的变化

Figure 3. Change in thermal conductivity of undisturbed and compacted specimens with water content during drying and wetting conditions

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图 4 去铁前、后原状样热传导系数随含水率的变化

Figure 4. Change in thermal conductivity of undisturbed specimens before and after iron removal with water content

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图 5 去铁前、后原状样的扫描电镜图像

Figure 5. SEM images of undisturbed specimens before and after iron removal

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图 6 原状和压实样的扫描电镜图像

Figure 6. SEM images of undisturbed and compacted specimens

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图 7 脱湿条件下原状和压实样的孔径分布

Figure 7. Pore size distributions of undisturbed and compacted specimens during drying conditions

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图 8 脱、吸湿条件下去铁后原状样的孔径分布

Figure 8. Pore-size distributions of undisturbed specimens after iron removal during drying and wetting conditions

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图 9 脱湿条件下去铁前、后原状红黏土试样的孔径分布

Figure 9. Pore-size distributions of undisturbed specimens before and after iron removal during drying conditions

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图 10 原状红黏土去铁前后微观结构变化示意图

Figure 10. Schematic diagram of microstructural changes in undisturbed specimens before and after iron removal

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图 11 红黏土试样孔隙比随体积含水量的变化

Figure 11. Variation of void ratio of lateritic clay with volumetric water content

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表 1 试验土样基本物性指标

Table 1 Physical property indexes of soil specimens

土粒相对质量密度	液限/%	塑限/%	缩限/%	体缩率/%	收缩系数	自由膨胀率/%	粒径分布/%
土粒相对质量密度	液限/%	塑限/%	缩限/%	体缩率/%	收缩系数	自由膨胀率/%	2~0.05 mm	2~0.05 mm	2~0.05 mm
2.74	61.8	38.1	27.1	15.51	0.23	25	24.95	24.95	24.95

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表 2 试验土样化学成分

Table 2 Chemical composition of soil specimens 单位：%

红黏土	Al₂O₃	Fe₂O₃	SiO₂	CaO	MgO	K₂O	Na₂O	其他
去铁前原状样	26.68	7.19	55.81	0.39	0.56	3.1	0.32	5.95
去铁后原状样	23.54	0.53	60.35	0.13	0.05	4.21	2.86	8.33

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表 3 试验土样矿物组成

Table 3 Mineral composition of soil specimens 单位：%

红黏土	高岭石	伊利石	透辉石	长石	白云石	石英	其他
去铁前原状样	30.7	12	8.1	9.9	4.6	34.7	3.1
去铁后原状样	28.4	11.5	0.4	10.6	5.1	41.6	2.4

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