疏水材料处理吉林西部乾安地区盐渍土的力学强度试验

doi:10.13278/j.cnki.jjuese.20210010

摘要/Abstract

摘要： 为了给吉林西部乾安地区盐渍土边坡水渠工程施工提供理论依据及施工参考，利用新型泥土超疏水乳液（CN）对该区盐渍土进行了处理，研究了不同处理条件下CN对盐渍土土体力学强度的影响，将经过不同处理的素土与CN土无侧限抗压强度进行对比，结果表明：1）在不同含水率条件下，CN土的无侧限抗压强度均有较大提升，且在14.86%含水率时取得最大提升率98.90%；随着含水率的增加，素土与CN土应力-应变曲线均存在由硬化型向软化型的转变，其阈值在最优含水率附近。2）随着压实度的增加，CN土无侧限抗压强度逐渐增强，在90%压实度条件下取得最大提升率130.77%；且CN处理后，原本呈塑性硬化型的素土转变成脆性软化型。3）盐分的增加对于CN土无侧限抗压强度起到了抑制作用，在0.3%含盐量条件下取得最大无侧限抗压强度1.33 MPa；过量的盐分结晶会破坏CN形成的纳米结构疏水膜，使得在高含盐量条件下，CN土的抗压强度低于素土。4）扫描电镜实验对CN土微观机理探讨，CN处理后使得土颗粒团聚呈大颗粒，颗粒表面光滑，孔隙发育减少。结构单元体和孔隙单元体的分析证明了处理后土体连结更为紧密，从而提升抗压强度。

关键词: 盐渍土, 超疏水材料, 无侧限抗压强度, 微观分析, 吉林西部乾安地区

Abstract: The degree of saline soil in Qian’an area, western Jilin Province increases gradually with the change of climate. Especially in the rainy season in July and August, the local engineering buildings are easily damaged due to the long-term impact of rain erosion and river erosion. In order to prevent from this damage, a new type of hydrophobic material (CN) was used to treat saline soil, and the effect of CN on the mechanical strength of saline soil under different treatment conditions was studied, and the unconfined compressive strength of soaked soil and CN soil was compared. The results show that: 1) Under different water content, the unconfined compressive strength of CN soil has been greatly improved, and the maximum rate of increase is 98.90% at 14.86% moisture content. With the increase of water content, the stress-strain curves of plain soil and CN soil change from hardening type to softening type, and the threshold value is near the optimal water content. 2) With the increase of compactness, the unconfined compressive strength of saline soil improved by CN increased gradually, and the maximum improvement rate of 130.77% was achieved under the condition of 90% compactness. After CN treatment, the original plastic hardening type of plain soil is transformed into brittle softening type. 3) The increase of salt content can inhibit the unconfined compressive strength of CN soil, the maximum unconfined compressive strength of CN soil is 1.33 MPa at 0.3% salt content. Excessive salt crystallization will destroy the nanostructured hydrophobic membrane formed by CN, which makes the compressive strength of CN soil lower than that of plain soil under the condition of high salt content. 4) Scanning electron microscope (SEM) test was used to explore the micro mechanism of CN soil. After CN treatment, the soil particles agglomerate into large particles, the surface of particles is smooth, and the pore development is reduced. The analysis of structural units and pore units proves that the soil is connected more closely after treatment, thereby improving the compressive strength.

Key words: saline soil, super-hydrophobic material, unconfined compressive strength, microanaly-sis, Qian’an area,western Jilin Province

中图分类号:

TU411

王清, 汪洲, 韩梦霞, 刘经. 疏水材料处理吉林西部乾安地区盐渍土的力学强度试验[J]. 吉林大学学报(地球科学版), 2021, 51(3): 804-814.

Wang Qing, Wang Zhou, Han Mengxia, Liu Jing. Mechanical Strength of Saline Soil Treated by Hydrophobic Soil Material in Qian’an Area,Western Jilin Province[J]. Journal of Jilin University(Earth Science Edition), 2021, 51(3): 804-814.

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