减载伸长路径下棕榈纤维加筋砂力学响应
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TU411

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云南省交通运输厅科技项目“高寒生态脆弱山区困难立地条件下公路边坡生态修复技术研究”([2018]39)


Mechanical response of palm fiber-reinforced sand under reduced extensional path
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    摘要:

    为探究减载伸长破坏下棕榈纤维对石英砂力学性能的影响,对饱和状态下棕榈纤维加筋石英砂进行排水状态下的三轴伸长试验,分析了不同纤维长度和掺量下的应力-应变曲线,并对其初始弹性模量和割线模量进行比较。应用摩尔库伦准则分析得到剪切强度随纤维配比的变化规律。对剪切过程中的素砂和加筋砂的体积应变及孔隙比进行了比较分析。结果表明:(1)纤维加筋会增强石英砂在伸长破坏中的应力应变强度。对峰值应力和残余应力提升效果最佳的的纤维掺量和纤维长度分别为0.9%和12 mm。(2)试样的初始弹性模量和峰值割线模量均随有效围压的增大而增大,伸长试验中试样的整体刚度与有效围压呈正相关关系。纤维对石英砂剪切强度的增强效果只能在低围压状态时显现。(3)加筋砂的伸长破坏中孔隙比小于素砂,纤维的加入减小了石英砂的临界孔隙比,削弱了石英砂的剪胀性。试验结果为探究纤维加筋砂界面增强机理提供试验依据。

    Abstract:

    This study investigates the effect of palm fibers on the mechanical properties of quartz sand under uniaxial tensile loading. Three axial tensile tests were conducted on saturated quartz sand reinforced with different fiber lengths and contents under drained conditions. The stress-strain curves were analyzed, and the initial elastic modulus and secant modulus were compared. The variation of the shear strength with fiber content was analyzed using the Mohr-Coulomb criterion. The volume strain and porosity of the sand and reinforced sand during the shear process were compared and analyzed. The results show that: (1) fiber reinforcement can enhance the stress-strain strength of quartz sand during tensile failure. The optimal fiber content and length for improving peak stress and residual stress are 0.9% and 12 mm, respectively. (2) The initial elastic modulus and peak secant modulus of the samples increase with increasing effective confining pressure, and the overall stiffness of the sample during the tensile test is positively correlated with the effective confining pressure. The strengthening effect of fibers on the shear strength of quartz sand only appears in the low confining pressure state. (3) The porosity of the reinforced sand during stretching failure is smaller than that of the plain sand, and the addition of fibers reduces the critical porosity of quartz sand and weakens its dilatancy. The experimental results provide a basis for exploring the interface strengthening mechanism of fiber-reinforced sand.

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刘昆钰,唐玉肖,刘问,等. 减载伸长路径下棕榈纤维加筋砂力学响应[J]. 科学技术与工程, 2024, 24(18): 7792-7803.
Liu Kunyu, tangyuxiao, Liu Wen, et al. Mechanical response of palm fiber-reinforced sand under reduced extensional path[J]. Science Technology and Engineering,2024,24(18):7792-7803.

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  • 收稿日期:2023-06-24
  • 最后修改日期:2024-06-20
  • 录用日期:2023-10-19
  • 在线发布日期: 2024-07-05
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