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木质素纤维红黏土强度及变形特性试验研究

董吉 陈筠 邬忠虎 杨恒 陈泰徐

董吉, 陈筠, 邬忠虎, 等, 2019. 木质素纤维红黏土强度及变形特性试验研究. 地质力学学报, 25 (3): 421-427. DOI: 10.12090/j.issn.1006-6616.2019.25.03.039
引用本文: 董吉, 陈筠, 邬忠虎, 等, 2019. 木质素纤维红黏土强度及变形特性试验研究. 地质力学学报, 25 (3): 421-427. DOI: 10.12090/j.issn.1006-6616.2019.25.03.039
DONG Ji, CHEN Jun, WU Zhonghu, et al., 2019. EXPERIMENTAL STUDY ON THE SHEAR STRENGTH AND DEFORMATION CHARACTERISTICS OF LIGNIN-FIBER RED CLAY. Journal of Geomechanics, 25 (3): 421-427. DOI: 10.12090/j.issn.1006-6616.2019.25.03.039
Citation: DONG Ji, CHEN Jun, WU Zhonghu, et al., 2019. EXPERIMENTAL STUDY ON THE SHEAR STRENGTH AND DEFORMATION CHARACTERISTICS OF LIGNIN-FIBER RED CLAY. Journal of Geomechanics, 25 (3): 421-427. DOI: 10.12090/j.issn.1006-6616.2019.25.03.039

木质素纤维红黏土强度及变形特性试验研究

doi: 10.12090/j.issn.1006-6616.2019.25.03.039
基金项目: 

贵州省科学技术基金 黔科合J字[2015]2033号

贵州大学人才引进项目 贵大人基合字[2017]63号

贵州省土木工程一流学科建设项目 QYNYL[2017]0013

详细信息
    作者简介:

    董吉(1993-), 男, 在读硕士, 研究方向为岩土体工程性质及其应用研究。E-mail:951041519@qq.com

  • 中图分类号: TU446

EXPERIMENTAL STUDY ON THE SHEAR STRENGTH AND DEFORMATION CHARACTERISTICS OF LIGNIN-FIBER RED CLAY

  • 摘要: 利用工业废料改良土体性能不仅具有实用价值而且能够保护环境。采用室内土工试验及SEM试验,针对木质素纤维加筋红黏土的效果,以及木质素纤维掺量对红黏土强度及变形特性的影响规律和作用机理进行研究。试验结果表明:木质素红粘土压缩模量随着纤维掺量的增加先增加后减小,2%纤维掺量时,模量最高;不同木质素掺量红粘土的内摩擦角基本保持不变;红黏土黏聚力随木质素掺量的增加先减小后增大再减小。2%是纤维最优掺量,土体黏聚力出现最大值;在三轴实验中,加筋红黏土试样均发生鼓胀变形,没有明显的破裂面,具有典型的应变硬化特征。研究结果表明木质素纤维能一定程度提高红粘土的强度,提升红粘土的工程应用价值。

     

  • 图  1  木质素纤维

    Figure  1.  Lignin-fibers

    图  2  不同掺量下红黏土比重变化曲线

    Figure  2.  Variation curve of red clay under different dosage

    图  3  不同掺量下红黏土压缩模量

    Figure  3.  The compression modulus of red clay under different dosages

    图  4  不同围压下应力-应变关系曲线

    Figure  4.  Stress-strain relation curves under different confining pressures

    图  5  纤维掺量对内摩擦角的影响

    Figure  5.  Influence of fiber content on internal friction angle

    图  6  纤维掺量对黏聚力的影响

    Figure  6.  Influence of fiber content on cohesion

    图  7  纤维表面扫描电镜照片(放大1200倍)

    Figure  7.  Scanning electron microscope images of fiber surface (magnified 1200 times)

    图  8  各围压下木质素纤维红黏土试验破损形态

    Figure  8.  Test failure patterns of lignin-fibrous red clay under different confining pressures

    表  1  红黏土的物理性质指标

    Table  1.   Physical properties of red clay

    物理参数
    天然含水率ω/% 66
    天然密度ρ/(g·cm-3) 1.70
    塑限ωP/% 48.6
    液限ωL/% 82
    比重γ/(g·cm-3) 2.67
    下载: 导出CSV

    表  2  木质素纤维物理性质参数

    Table  2.   Physical properties of lignin-fibers

    纤维参数
    纤维长度/mm 6~8
    灰分含量/% 18±5
    pH值 7.5±1
    含水率/% <5
    耐热能力/℃ 230
    下载: 导出CSV

    表  3  三轴压缩试验强度指标

    Table  3.   Triaxial compression test strength index

    纤维掺量/% 抗剪强度指标 主应力差(σ1-σ3)/kPa
    黏聚力c/kPa 内摩擦角φ/(°) 围压50/kPa 围压100/kPa 围压200/kPa 围压300/kPa 围压400/kPa
    0 24.9 15.8 118 149.6 227.7 322.4 366.1
    1 20.1 15.6 94.9 158.2 192.9 284.5 344.5
    1.5 34.9 15.2 128.3 169.5 228.6 287.4 386.9
    2 36.7 16.5 139.9 176.4 241.8 348.8 396.9
    2.5 31.3 16.2 130.5 172.9 229.5 334.8 377.3
    3 18.9 15.4 120.3 169.1 222.2 322.8 348.8
    下载: 导出CSV
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  • 收稿日期:  2018-10-10
  • 修回日期:  2018-12-14
  • 刊出日期:  2019-06-28

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