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首页 > 过刊浏览>2024年第27卷第5期 >446-453. DOI:10.3969/j.issn.1007-9629.2024.05.009
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高分子活性剂改良盐渍土力学特性及机理研究
作者:
作者单位:

1.河海大学 地球科学与工程学院，江苏 南京 211100;2.自然资源部国土(耕地)生态监测与修复工程技术创新中心 江苏省地质调查研究院，江苏 南京 210018

作者简介:

车文越（1992—），男，江苏镇江人，河海大学博士生．E-mail： chewy920728@163.com

通讯作者:

刘 瑾（1983—），女，福建漳州人，河海大学教授，博士生导师，博士．E-mail： jinliu920@163.com

中图分类号:

TU411

基金项目:

自然资源部国土（耕地）生态监测与修复工程技术创新中心开放课题（GTST2021-006）


Improvement of Mechanical Properties of Saline Soil by Polymer Active Agent and Its Mechanism
Author:
Affiliation:

1.School of Earth Sciences and Engineering， Hohai University， Nanjing 211100， China;2.Ministry of Natural Resources Geological Survey of Jiangsu Province， Technology Innovation Center for Ecological Monitoring & Restoration Project on Land(Arable)， Nanjing 210018， China

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    摘要:

    基于三轴剪切试验与可溶盐含量测试，探究高分子活性剂掺量与养护时间对硫酸型盐渍土力学性能与可溶盐含量的影响，揭示土体微观特性及其改良机理.结果表明：CLI型高分子活性剂的掺入能有效提升硫酸型盐渍土的力学强度和抗变形能力，其最佳掺量为8%；活性剂与盐渍土发生置换反应，从而增强盐渍土的保水性能，有效降低盐渍土的可溶盐含量，CLI型高分子活性剂掺量越大，改良效果越好；养护时间达到7 d时，盐渍土的可溶盐含量趋于稳定.

    Abstract:

    The effects of polymer active agent content and curing time on the mechanical properties and salinity changes of sulfate saline soil were investigated by triaxial shear test and soluble salt content test. The microscopic characteristics and improvement mechanism of CLI polymer active agent surfactant were also investigated. The results show that the addition of CLI polymer active agent can effectively improve the mechanical strength and anti-deformation ability of sulfate saline soil， and its optimal dosage is 8%. The pores are filled by the displacement reactions between CLI polymer active agent and the saline soil， improving the water retention performance. It can also effectively reduce the soluble salt content in the saline soil. The higher the CLI polymer active agent content， the better the improvement. The soluble salt content tends to be stable after 7 days.

    表 2 CLI的基本物理参数Table 2 Basic physical parameters of CLI
    图1 不同围压条件下养护1 d时各试样偏应力-轴向应变曲线Fig.1 Deviatoric stress-axial strain curves of samples after curing for 1 day under various confining pressures
    图2 不同养护时间和CLI掺量下试样的内聚力和内摩擦角Fig.2 Cohesions and internal friction angles of samples with different curing times and CLI contents
    图3 不同干密度下改良盐渍土试样S8的内聚力与内摩擦角Fig.3 Cohesions and internal friction angles of sample S8 with different dry densities（7 d）
    图4 各试样的含水率与可溶盐含量Fig.4 Moisture content and soluble salt content of samples
    图5 试样S0和S8的XRD图谱Fig.5 XRD patterns of S0 and S8 samples（7 d）
    图6 试样S0和S8的EDS扫描分析Fig.6 EDS scanning analysis of S0 and S8 samples（7 d）
    图7 试样S0和S8的SEM照片Fig.7 SEM images of S0 and S8 samples（7 d）
    图8 硫酸型盐渍土与CLI反应原理示意图Fig.8 Schematic diagram of reaction between sulphuric acid saline soil and CLI
    图9 CLI掺量对盐渍土Zeta电位的影响Fig.9 Effect of different contents of CLI polymer active agent on the Zeta potential of saline soil（7 d）
    表 1 硫酸型盐渍土的基本物理参数Table 1 Basic physical parameters of sulfate saline soil
    表 3 不同养护时间及围压条件下各试样的峰值偏应力Table 3 Peak deviatoric stress of samples under different curing times and confining pressures
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车文越,刘瑾,郝社锋,卜凡,任静华.高分子活性剂改良盐渍土力学特性及机理研究[J].建筑材料学报,2024,27(5):446-453

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  • 收稿日期:2023-06-10
  • 最后修改日期:2023-09-26
  • 在线发布日期: 2024-06-11
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