一维固结软黏土微观结构及渗透系数各向异性

李凯; 加瑞; 张作合; 王雪松; 王玉琢; 蔺宏岩; 吴娟

doi:10.20265/j.cnki.issn.1007-2993.2024-0134

一维固结软黏土微观结构及渗透系数各向异性

doi: 10.20265/j.cnki.issn.1007-2993.2024-0134

1.
绥化学院农业与水利工程学院，黑龙江绥化　152061
2.
天津大学建筑工程学院，天津　300072
3.
绥化学院办公室，黑龙江绥化　152061

基金项目: 黑龙江省自然科学基金项目（LH2023D021）；黑龙江省省属本科高校基本科研业务费项目（YWF10236220240）

详细信息

作者简介:
李　凯，女，1987年生，硕士，讲师，主要从事土的工程特性研究。E-mail：likai13703638115@163.com

中图分类号: TU447
计量
- 文章访问数: 25
- HTML全文浏览量: 7
- PDF下载量: 2
- 被引次数: 0
出版历程
- 收稿日期: 2024-03-29
- 修回日期: 2024-07-26
- 录用日期: 2025-01-02
- 刊出日期: 2025-06-09

Microstructure and permeability anisotropy of soft clay during one-dimensional compression

1.
Agriculture and Hydraulic Engineering College, Suihua University, Suihua 152061, Heilongjiang, China
2.
Civil Engineering College, Tianjin University, Tianjin 300072, China
3.
School Office, Suihua University, Suihua 152061, Heilongjiang, China

摘要

摘要: 为研究软黏土微观结构定向演化规律及其与渗透系数各向异性的相关性，选取天津滨海新区软土作为研究对象，通过渗透试验研究软土渗透系数的各向异性，利用扫描电镜SEM（Scanning Electron Microscopy）和IPP（Image-Pro Plus）显微图像处理技术，对固结前后软土微观结构的定向性进行了定性与定量分析。研究结果表明：天津软土原状样孔隙存在一定的定向性，但不明显，孔隙的定向性随着固结压力的增大而增大；渗透系数的各向异性率随着固结压力的增大呈线性增大趋势，增大趋势在200 kPa之后减缓。由此可见，软土渗透系数的各向异性与其微观结构的各向异性有一定的相关性，但是当固结压力增大时，相关性有所减弱。
- 软土 /
- 渗透系数 /
- 微观结构 /
- 各向异性
Abstract: To study the directional evolution law of soft clay microstructure and its correlation with the anisotropy of permeability coefficient, soft soil samples from the Binhai New Area in Tianjin were selected as the research object. The permeability coefficient anisotropy of Tianjin soft soil was studied through permeability tests, and the directionality of the microstructure of Tianjin soft soil before and after consolidation was qualitatively and quantitatively analyzed using scanning electron microscopy (SEM) and Image-Pro Plus (IPP) microscopy image processing technology. The research results show that there is a certain degree of directionality in the pores of the original Tianjin soft soil, but it is not obvious. The directionality of the pores increases with the increase of consolidation pressure; the anisotropy rate is linear with the increase of consolidation pressure. The increasing trend slows down after 200 kPa. Therefore, the permeability anisotropy has a certain correlation with the microstructural anisotropy, but when the consolidation pressure increases, the correlation weakens.
- soft clay /
- permeability coefficient /
- microstructure /
- anisotropy

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图 1 取样位置及SEM试验观察面

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图 2 不同固结压力下天津黏土水平向试样 SEM 图片

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图 3 不同固结压力下天津黏土垂直向试样 SEM 图片

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图 4 不同固结压力下孔隙定向频率分布

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图 5 不同固结压力下竖直向试样孔隙定向角玫瑰图

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图 6 各向异性率与固结压力的关系曲线

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表 1 天津软土物相组成及含量 %

物相组成	石英	伊利石	长石	方解石	白云石	高岭石	Al₂O₃	埃洛石	蛭石	亚氯酸盐	蒙脱石
含量	30.39	28.04	12.06	11.22	6.12	5.79	0.13	0	0.26	3.81	2.18

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表 2 各向异性率与固结压力关系表

固结压力/kPa	各项异性率/%	固结压力/kPa	各项异性率/%
0	41.16	100	60.99
25	46.56	200	76.95
50	51.97	400	80.00

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表 3 垂直、水平渗透系数以及渗透系数各向异性值

固结压力 /kPa	垂直渗透系数k_v/(cm·s⁻¹)	水平渗透系数k_h/(cm·s⁻¹)	渗透系数各向异性值
50	4.19×10⁻⁷	5.85×10⁻⁷	1.39
100	2.26×10⁻⁷	4.47×10⁻⁷	1.98
200	1.81×10⁻⁷	3.70×10⁻⁷	2.04
400	1.07×10⁻⁷	3.10×10⁻⁷	2.90

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