黄麻纤维加筋砂土抗剪特性试验研究

罗小琴; 李文阳; 高腾; 杨凯龙; 程月新; 郭鸿; 蒋红

doi:10.20265/j.cnki.issn.1007-2993.2024-0331

黄麻纤维加筋砂土抗剪特性试验研究

doi: 10.20265/j.cnki.issn.1007-2993.2024-0331

罗小琴^{1, 2,},
李文阳^{1, 2},
高腾¹,
杨凯龙^{1, 2},
程月新^{1, 2},
郭鸿^{1, 2, 3, ,},
蒋红^{1, 2, 3}

1.
陕西理工大学土木工程与建筑学院，陕西汉中　723001
2.
陕西理工大学人居环境科研学社，陕西汉中　723001
3.
陕西理工大学秦巴山地岩土环境与灾害防治研究中心，陕西汉中　723001

基金项目: 陕西省重点研发计划项目（2023-YBSF-324）；陕西省教育厅服务地方专项计划项目（23JC019）；陕西理工大学自然科学创新基金项目（GFC2401）

详细信息

作者简介:
罗小琴，女，2001年生，硕士研究生，研究方向为加筋土技术及加筋结构。E-mail：19140275509@163.com

通讯作者:
郭　鸿，男，1984年生，博士，副教授，研究方向为颗粒物质力学、岩土工程理论及数值模拟。E-mail：hguo@snut.edu.cn

中图分类号: TU411.7
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- 文章访问数: 12
- HTML全文浏览量: 6
- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2024-07-19
- 修回日期: 2024-10-16
- 录用日期: 2025-01-02
- 刊出日期: 2025-08-08

Shear characteristics of jute fiber-reinforced sandy soil

Luo Xiaoqin^{1, 2
,},
Li Wenyang^{1, 2},
Gao Teng¹,
Yang Kailong^{1, 2},
Cheng Yuexin^{1, 2},
Guo Hong^{1, 2, 3
, ,},
Jiang Hong^{1, 2, 3}

1.
School of Civil Engineering and Architecture, Shaanxi University of Technology, Hanzhong 723001, Shaanxi, China
2.
Student Research Society of Human Settlements, Shaanxi University of Technology, Hanzhong 723001, Shaanxi, China
3.
Research Center of Geotechnical Environment and Geological Hazards Control in Qinling-Daba Mountains, Shaanxi University of Technology, Hanzhong 723001, Shaanxi, China

摘要

摘要: 为研究生态纤维对砂土的加固机理及效果，以黄麻纤维加筋砂土为研究对象，通过室内直剪试验与离散元数值模拟相结合的方法，分析不同的黄麻纤维含量对加筋砂土抗剪性能的影响。研究结果表明：黄麻纤维掺入砂土中能有效提高砂土的抗剪强度，砂土的黏聚力和内摩擦角均随着纤维掺量的增加先增大后减小；当纤维含量为0.4%时，黏聚力的增长最为显著，达到20.8 kPa；在纤维含量为 0.2%时，内摩擦角增幅最大，其值为14.69%。研究成果可为生态纤维在砂土填筑工程中的应用提供参考依据。
- 纤维加筋砂土 /
- 纤维含量 /
- 直剪试验 /
- 离散元数值模拟
Abstract: To study the reinforcement mechanism and effect of ecological fibers on sandy soil, jute fiber-reinforced sandy soil was taken as the research object. Through a combination of indoor direct shear tests and discrete element numerical simulations, the influence of different jute fiber contents on the shear performance of reinforced sandy soil was analyzed. The research results show that the addition of jute fiber to sand can effectively improve the shear strength of sand. The overall trend is that the cohesion and internal friction angle of sand first increase and then decrease with the increase of fiber content. When the fiber content is 0.4%, the increase in cohesion is the most significant, reaching 20.8 kPa. When the fiber content is 0.2%, the increase in internal friction angle is the largest, with a value of 14.69%. This study provides a reference for the application of ecological fibers in sandy soil filling projects.
- fiber-reinforced sand /
- fiber content /
- direct shear test /
- discrete element numerical simulation

HTML全文

图 1 砂土试样颗粒级配曲线

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图 2 纯砂土和加筋砂土（0.2%）的强度参数分析

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图 3 抗剪强度指标随纤维含量的变化

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图 4 不同纤维含量时纤维加筋砂土抗剪强度–垂直应力变化拟合图

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图 5 不同纤维含量下的剪应力–剪切位移曲线

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图 6 不同纤维含量下的力链图

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图 7 纤维加筋土剪切过程的力链变化图

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表 1 砂土的物理力学指标

密度 /(kg·m⁻³)	含水率 /％	黏聚力 /kPa	内摩擦角 /(°)	不均匀系数	曲率系数	孔隙率
1600	0.23	0	32	2.91	1.12	0.33

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表 2 黄麻纤维的物理力学指标

密度 /(kg·m⁻³)	直径 /μm	比重	抗拉强度 /MPa	弹性模量 /GPa	伸长率 /％
1400	70	1.211	800	1.2	2.1

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表 3 砂土与黄麻纤维物理力学指标

材料	密度 /(kg·m⁻³)	刚度比	有效模量/MPa	摩擦系数	抗拉强度/MPa	阻尼	加载速率 /(m·s⁻¹)	初始孔隙率
砂土	2700	1.5	2000	0.4		0.7	0.01	0.16
纤维	1400	1.0	1200	0.7	800	0.7	0.01	0.16

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