棕榈纤维增强石英砂的力学性能分析

doi:10.16843/j.sswc.2023006

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摘要为探究棕榈纤维对石英砂的增强机制,对饱和状态下的棕榈纤维加筋石英砂进行三轴排水压缩试验,得到不同加筋配比下的应力应变曲线、强度包络线、体积应变曲线,分析纤维掺量、纤维长度对压缩试样峰值强度加筋效应系数、剪切强度和孔隙比的影响规律。结果表明:1)加筋砂的峰值强度和残余强度对比素砂试样有显著提高,其中峰值强度的最大加筋效应系数为1.39,而纤维加筋砂的最大残余强度可达到素砂的2.2倍,纤维主要加强石英砂的残余强度。偏应力曲线由应变软化向应变硬化发展。同时纤维加筋提升试样到达峰值强度时的轴向应变,提高石英砂的抗变形能力;2)在选定的纤维配比下,纤维掺量越大、纤维越长,加筋砂试样抗剪强度的提升效果越显著,纤维长度为20 mm,纤维掺量为0.9%时配比最优;3)剪胀阶段,素砂试样的体积应变达到最大值后趋于稳定,加筋砂试样体积应变在剪切过程中一直保持上升趋势,并逐渐超过素砂。与素砂相比,纤维的加入会增大试样到达临界孔隙比时的轴向应变,进而减小试件的剪胀速率,增强石英砂的韧性。棕榈纤维与石英砂颗粒间的界面应力整体提升石英砂的力学性能,为植物纤维加筋技术在固砂工程中的应用提供试验依据。

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	唐玉肖
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关键词 ：棕榈纤维, 石英砂, 力学性能, 纤维加筋, 残余强度, 孔隙比

Abstract：[Background] Sandy soil is more likely to cause soil erosion and stratum deformation because of its loose structure, easy liquefaction, easy erosion and other defects. In recent years, fiber reinforcement technology has been widely used in road and slope protection projects because of its ability to improve soil structure and enhance the mechanical properties of soil as a whole. However, when synthetic fibers are used as reinforcing materials to strengthen the soil, the characteristics of synthetic fibers, such as difficult to degrade and easy to cause environmental pollution, make it difficult to be widely promoted in actual projects. Therefore, this paper investigates the effect of mixing natural palm fiber into quartz sand to simulate the effect of plant fiber reinforcement technology on sandy soil, which is of great significance for analyzing the soil and water conservation effect of plant fiber reinforcement technology. [Methods] Triaxial drained compression tests were carried out on saturated palm fiber reinforced quartz sand. The deviator-strain curve, stress path and volume change under different reinforcement conditions were obtained. According to the test results, the coefficient of enhanced strength of fiber reinforced sand, shear strength and void ratio of the compressed sample were analyzed with the fiber content and fiber length. [Results] 1) The peak deviator stress and residual strength of the reinforced sand sample are higher than that of plain sand samples. The maximum coefficient of enhanced strength is 1.39, while the maximum residual strength of the fiber reinforced sand can reach 2.2 times of plain sand. The fiber mainly strengthens the residual strength of the quartz sand. Therefore, the strain softening behavior of pure sand changes into strain hardening performance of fiber reinforced sand, which has more ability to resist the deformation. 2) It shows that the shear strength of sand samples generally increases with the fiber content, as well as generally increases with fiber length. The shear strength is the highest when the fiber length is 20 mm and the fiber content is 0.9%. 3) The volumes of fiber reinforced sand have a similar trend as the pure sand, but they can reach higher values and keep increasing rather than converging at a stable value. Compared with pure sand, the axial strain of fiber reinforced sand changes greatly when reaching the critical porosity, and the dilatancy rate of the specimen reduces, which proves that palm fibers help sand samples enhance the ability to resist greater strains. [Conclusions] The interfacial stress between palm fiber and quartz sand particles improves the mechanical properties of quartz sand, and the results provide a test basis for the application of plant fiber reinforcement technology in sand fixing engineering.

Key words： palm fiber quartz sand mechanical properties fiber reinforced residual strength porosity ratio

收稿日期: 2024-06-17

PACS:	S156.99
	TU411

基金资助:国家自然科学基金"基于生物炭改性水泥基体的高韧性植物纤维水泥基复合材料的制备方法研究"(52378215);北京市政建设有限公司资助项目"软弱富水地层地铁盾构隧道三线并行施工关键技术研究"(CZDT-02-07-QT-042(KY))

通讯作者: 刘问(1983-),女,副教授,硕士生导师。主要研究方向:公路边坡生态修复。E-mail:liuwen@bjfu.edu.cn E-mail: liuwen@bjfu.edu.cn

作者简介: 唐玉肖(1997-),男,硕士研究生。主要研究方向:植物纤维加固砂土。E-mail:tyx19970322@bjfu.edu.cn

引用本文:

唐玉肖, 刘问, 刘学彦, 魏少伟, 刘腾. 棕榈纤维增强石英砂的力学性能分析[J]. 中国水土保持科学, 2024, 22(6): 144-154.
TANG Yuxiao, LIU Wen, LIU Xueyan, WEI Shaowei, LIU Teng. Mechanical properties analysis of palm fiber reinforced quartz sand. SSWC, 2024, 22(6): 144-154.

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http://journal12.magtechjournal.com/Jweb_stbc/CN/10.16843/j.sswc.2023006 或 http://journal12.magtechjournal.com/Jweb_stbc/CN/Y2024/V22/I6/144

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