游离氧化铁对红黏土持水特性的影响

牛庚; 孙德安; 韦昌富; 邵龙潭

doi:10.11779/CJGE201812021

游离氧化铁对红黏土持水特性的影响 English Version

牛庚^1,2,4,
孙德安^3,4,
韦昌富⁴,
邵龙潭^1,2

1. 大连理工大学工程力学系,辽宁大连116085;
2.大连理工大学工业装备结构分析国家重点实验室,辽宁大连 116085;
3. 上海大学土木工程系,上海 200444;
4. 桂林理工大学广西建筑新能源与节能重点实验室,广西桂林 541004

基金项目: 国家自然科学基金项目（51479023; 11372078）; 广西建筑新能源与节能重点实验室项目（桂科能17-J-22-1）

详细信息

作者简介:
牛庚(1991- ),男,博士研究生,主要从事非饱和土力学的研究工作。E-mail: niugeng@mail.dlut.edu.cn。

中图分类号: TU43
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出版历程
- 收稿日期: 2017-10-16
- 发布日期: 2018-12-24

Effects of free iron oxide on water retention behavior of lateritic clay

1. Department of Engineering Mechanics, Dalian University of Technology, Dalian 116085, China;
2. State Key Laboratory of Structural Analysis of Industrial Equipment, Dalian University of Technology, Dalian 116085, China;
3. Department of Civil Engineering, Shanghai University, Shanghai 200444, China;
4. Guangxi Key Laboratory of New Energy and Energy Conservation for Architecture, Guilin University of Technology, Guilin 541004, China

摘要

摘要: 分别以红黏土去铁前后的原状样为研究对象,采用压力板仪和饱和盐溶液蒸气平衡法测得全吸力范围内的土水特征曲线并同时量测体变;利用压汞试验测量不同吸力下的孔径分布,以探讨去铁前后红黏土的孔隙结构,并解释宏观持水特性。试验结果表明：低吸力范围（0~1 MPa）,去铁前原状样的持水曲线下降较为明显,而去铁后原状样的持水曲线较平缓,尤其是吸力-饱和度的关系,到1 MPa时基本上仍为饱和状态,所以去铁后土样进气值增大;去铁后的原状样随着吸力的增大收缩明显,而原状样的收缩相对较缓,主要原因是游离氧化铁以包膜和桥的形式分布在颗粒表面,加强了颗粒之间的连接和包裹作用,使得土骨架抵抗变形的能力增强。高吸力范围（9~367 MPa）,去铁前后红黏土持水和收缩特性相差不大,此时游离氧化铁的作用不明显。去铁前后的红黏土原状样基本上存在单峰孔隙结构,主要原因是在自然经过无数次胀缩变形,相对较大的孔隙收缩,最终使孔径分布相对均匀;随着吸力的增加,这两种土样孔隙结构基本上不变。
- 游离氧化铁 /
- 红黏土 /
- 持水特性 /
- 压汞试验 /
- 原状样
Abstract: In order to obtain the soil-water characteristic curve (SWCC) of two types of undisturbed lateritic Guilin specimens with and without free iron oxide in full suction range, two measurement methods are used: the pressure plate method and the vapor equilibrium method with saturated salt solution, and the volumes of specimens are measured during the process. The mercury intrusion porosimetry (MIP) tests are used to investigate the pore-size distributions. The test results show that in the low suction range, the SWCC of undisturbed specimens where the free iron oxide is removed is gentle. Especially in the relationship of suction-saturation, it's still saturated when the suction is 1 MPa. But the SWCC of undisturbed specimens declines obviously. Compared with the undisturbed specimens, the undisturbed specimens where the free iron oxide is removed shrink obviously. The main reason is that the free iron oxide is distributed on the particle surface in the form of film enveloping and bridge, which strengthens the connection and the coat effect between particles, so as to enhance the capability of the soil skeleton to resist deformation. In the high suction range, the water retention and shrinkage characteristics of the two types of undisturbed specimens have little difference, indicating that the absorbed water in the soil is dominant. The undisturbed specimens with and without free iron oxide exhibit a unimodal pore-size distribution, and they are different from the traditional understanding of a double-porosity microstructure. There are mainly intergranular pores with a diameter of 40 nm in compacted samples.
- free iron oxide /
- lateritic clay /
- water retention behavior /
- MIP /
- undisturbed specimen

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