长江科学院院报 ›› 2024, Vol. 41 ›› Issue (11): 144-150.DOI: 10.11988/ckyyb.20230507

• 岩土工程 • 上一篇    下一篇

不同纤维对土体力学特性的影响及机理分析

牛雷1(), 吴占君1, 徐丽娜2(), 毕苏红1, 黄占芳3   

  1. 1 吉林建筑大学 土木工程学院,长春 130118
    2 吉林建筑大学 交通科学与工程学院,长春 130118
    3 山东理工大学 建筑工程与空间信息学院,山东 淄博 255049
  • 收稿日期:2023-05-09 修回日期:2023-12-18 出版日期:2024-11-01 发布日期:2024-11-26
  • 通讯作者: 徐丽娜(1986-),女,吉林通化人,副教授,博士,从事地基加固及桩基工程等方面的研究。E-mail:xulina@jlju.edu.cn
  • 作者简介:

    牛 雷(1981-),男,吉林长春人,讲师,博士,从事岩土与城市地下工程等方面的研究。E-mail:

  • 基金资助:
    国家自然科学基金项目(52008185); 吉林省科技厅重点研发项目(20220203063SF)

Effect of Different Fibers on Soil Mechanical Properties and Mechanism Analysis

NIU Lei1(), WU Zhan-jun1, XU Li-na2(), BI Su-hong1, HUANG Zhan-fang3   

  1. 1 School of Civil Engineering, Jilin Jianzhu University, Changchun 130118, China
    2 School of Transportation Science and Engineering, Jilin Jianzhu University, Changchun 130118, China
    3 School of Civil Engineering and Geomatics, Shandong University of Technology, Zibo 255049, China
  • Received:2023-05-09 Revised:2023-12-18 Published:2024-11-01 Online:2024-11-26

摘要:

为了探究不同纤维对土体加固效果的影响,将玄武岩纤维和玻璃纤维分别加入同一种土中,通过无侧限抗压强度试验,对比分析2种纤维加筋土的应力-应变曲线、强度随纤维掺量和纤维长度变化的关系;通过双根纤维锚固试验,分析纤维增强土体强度的作用机理。试验结果表明:纤维加筋土的抗压强度明显大于素土的抗压强度;随纤维长度的增加,玄武岩纤维和玻璃纤维加筋土的强度均呈现先增大后减小的趋势,纤维的最优长度均为9 mm;随着纤维掺量的增加,2种纤维加筋土强度呈现波浪式变化,存在2个峰值,纤维的最优掺量均为0.5%。通过纤维锚固试验,发现双根纤维的拉拔力随纤维间距的变化而变化,当间距较小时,纤维之间存在耦合影响,拉拔力存在峰值和谷值,随着纤维间距的增大,当达到临界锚固间距后,纤维之间互不影响。

关键词: 玄武岩纤维, 玻璃纤维, 纤维加筋土, 无侧限抗压强度, 纤维锚固

Abstract:

To investigate how different fibers influence soil reinforcement, basalt fiber and glass fiber were separately added to the same soil. Unconfined compressive strength tests were performed to compare the stress-strain curves and analyze the relationship between strength and both fiber content and fiber length for the two types of fiber-reinforced soil. Additionally,fiber anchorage test was conducted to explore the mechanisms of fibers enhancing soil strength. The results demonstrate that fiber-reinforced soil exhibits significantly greater compressive strength compared to plain soil. As fiber length increases, the strength of both basalt and glass fiber-reinforced soils first rises and then falls, with the optimal fiber length being 9 mm. Similarly, increasing fiber content causes the strength of both types of fiber-reinforced soil to fluctuate, with two peaks observed; the optimal fiber content is 0.5%. The fiber anchorage tests reveal that the pull-out force of the fibers varies with changes in fiber spacing. At small spacings, fibers interact, resulting in peak and valley values of pull-out force. As fiber spacing increases and reaches a critical anchorage distance, fibers no longer affect each other.

Key words: basalt fibre, glass fibre, fiber-reinforced soil, unconfined compressive strength, fiber anchorage

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