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干湿循环条件下生物聚合物改良砂土强度特性

宋泽卓 郝社锋 梅红 刘瑾 任静华 卜凡 王梓

宋泽卓, 郝社锋, 梅红, 等. 干湿循环条件下生物聚合物改良砂土强度特性[J]. 复合材料学报, 2022, 40(0): 1-12
引用本文: 宋泽卓, 郝社锋, 梅红, 等. 干湿循环条件下生物聚合物改良砂土强度特性[J]. 复合材料学报, 2022, 40(0): 1-12
Zezhuo SONG, Shefeng HAO, Hong MEI, Jin LIU, Jinghua REN, Fan BU, Zi WANG. Strength characteristics of biopolymer modified sand under dry-wet cycle[J]. Acta Materiae Compositae Sinica.
Citation: Zezhuo SONG, Shefeng HAO, Hong MEI, Jin LIU, Jinghua REN, Fan BU, Zi WANG. Strength characteristics of biopolymer modified sand under dry-wet cycle[J]. Acta Materiae Compositae Sinica.

干湿循环条件下生物聚合物改良砂土强度特性

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);国家自然科学基金项目(41877212);中央高校基本科研业务费项目(B210203037)
详细信息
    通讯作者:

    刘瑾,博士,教授,博士生导师,研究方向为环境地质工程、地质灾害监测 E-mail:jinliu920@163.com

  • 中图分类号: TU13

Strength characteristics of biopolymer modified sand under dry-wet cycle

Funds: Open Project of Technology Innovation Center for Ecological Monitoring & Restoration Project on Land (Arable), Ministry of Natural Re sources(GTST2021-006);National Natural Science Foundation of China(41877212);Fundamental Research Funds for the Central Universities(B210203037)
  • 摘要: 通过无侧限抗压强度试验和三轴剪切试验对生物聚合物(XG)/砂土复合材料强度特性进行研究,分析不同生物聚合物含量(与砂土质量比)和不同干湿循环次数对XG/砂土的强度特性的影响,并利用扫描电子显微镜和低场核磁共振分析仪对不同XG/砂土的微观结构进行分析与研究。研究结果表明:随着生物聚合物含量的增加,XG/砂土的无侧限抗压强度、峰值偏应力和黏聚力均发生增强,内摩擦角在27°~32°范围内变化。随着干湿循环的次数的增加,XG/砂土的无侧限抗压强度、峰值偏应力和黏聚力均发生一定的减小。当经历4次干湿循环时,XG/砂土的强度降幅约为29%。随着干湿循环次数的继续增加,强度的降幅稳定在20%左右。生物聚合物可以在砂土表面和孔隙中形成大量的网状结构,大量的网状结构相互连接为网状膜将砂土连接为一个整体。环境中水分的变化会使得网状膜产生一定的损伤,使得XG/砂土的力学性质降低。但相较于未经改良的砂土,XG/砂土仍然拥有较强的结构性和力学性质。

     

  • 图  1  试验用砂土粒径分布曲线

    Figure  1.  Particle size distribution curve of sand for test

    图  2  试样与试验仪器

    Figure  2.  Sample and test instruments

    图  3  不同生物聚合物含量XG/砂土试样典型应力-应变曲线

    Figure  3.  Typical stress-strain curves of XG/sand samples with different XG contents

    图  4  干湿循环次数对不同生物聚合物含量XG/砂土试样抗压强度的影响

    Figure  4.  Effect of dry-wet cycles on compressive strength of XG/sand samples with different XG contents

    图  5  100 kPa围压不同生物聚合物含量XG/砂土试样偏应力-应变曲线

    Figure  5.  Partial stress-strain curves of XG / sand samples with different XG contents under 100 kPa confining pressure

    图  6  XG/砂土峰值偏应力随干湿循环次数的变化曲线

    Figure  6.  Variation curves of peak partial stress of XG/sand with different dry-wet cycles

    图  7  XG/砂土黏聚力和内摩擦角随干湿循环次数的变化曲线

    Figure  7.  Variation curves of cohesion and internal friction angle of XG/sand with different dry-wet cycles

    图  8  干湿循环后XG/砂土SEM图像

    Figure  8.  SEM images of XG/sand after dry-wet cycle

    图  9  改良前后砂土的能谱测试结果

    Figure  9.  Energy spectrum test results of sand before and after modification

    图  10  不同干湿循环次数2%生物聚合物含量XG/砂土试样孔径的分布曲线

    Figure  10.  Pore size distribution curves of XG/sand samples with 2% XG content and different dry-wet cycles

    图  11  不同干湿循环次数2%生物聚合物含量XG/砂土试样孔隙度

    Figure  11.  Porosity of XG/sand samples with 2% XG content and different dry-wet cycles

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  • 收稿日期:  2022-04-18
  • 录用日期:  2022-06-13
  • 修回日期:  2022-06-08
  • 网络出版日期:  2022-06-29

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