根系及裂隙角度对基材原位剪切特性的影响
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TU411.7

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国家重点研发计划项目“西南高山亚高山区工程创面生态修复关键材料制备与优化应用技术”(2017YFC0504902);湖北省自然科学基金项目(2020CFB317);长江科学院开放基金项目(CKWV2018488/KY)


Effects of Root System and Fissure Angle on In-situ Shear Characteristics of Substrate
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    摘要:

    [目的] 研究岩体裂隙角度对不同植物根系下基材原位剪切特性的影响,旨在为水土保持与生态修复工作提供科学参考。[方法] 设置无植物、狗牙根和多花木兰3种条件,对试样养护90 d后,在岩体裂隙与剪切垂直方向为15°,30°,45°,60°,75°和90°下开展基材原位剪切试验。[结果] ①狗牙根和多花木兰根—基材复合体的抗剪强度和残余抗剪强度均明显大于无根基材,抗剪强度平均增幅分别为33.87%~65.18%,44.94%~73.65%。②无植物基材试样在位移量为8~11 mm时抗剪强度达到峰值,狗牙根根—基材复合体和多花木兰根—基材复合体则在20~36 mm时达到峰值位移,根系能够滞后植被混凝土的峰值位移,含根基材试样能够承受更大的变形。③同种植物,不同的岩隙分布形式对根系的固土能力影响不同。随着裂隙角度的增加其抗剪强度呈先增加后减小的趋势,在裂隙角度为60°时其抗剪强度达到最大值。[结论] 根系能显著增强植被混凝土基材的抗剪强度,提高残余剪切应力,不同裂隙的分布方式对提高基材的抗剪强度的作用呈现差异性,但对于残余抗剪强度,裂隙分布影响不明显。

    Abstract:

    [Objective] The effects of rock fissure angle on the in-situ shear characteristics of the base material under different plant root systems were studied, in order to provide a scientific reference for water and soil conservation and ecological restoration.[Methods] The samples were cured for 90 days under three conditions:plant-free, bermudagrass and multi-flowered magnolia. The in-situ shear test of the substrate was carried out under the angle of 15°, 30°, 45°, 60°, 75° and 90° between the rock crack and the vertical direction of shear.[Results] ①The shear strength and residual shear strength of bermudagrass and magnolia root-substrate composites were significantly greater than those of non-rooted substrates. The average increase in shear strength was 33.87%-65.18% and 44.94%-73.65% respectively. ② The shear strength of samples without plant substrate reached the peak value when the displacement was 8-11 mm, while the bermudagrass root-substrate composite and the multifloral magnolia root-soil composite reached the peak value when the displacement was 20-36 mm. The root system could lag the peak displacement of the vegetation concrete, and root-containing substrate sample could withstand greater deformation. ③ For the same plant, different distribution of rock fissures had different effects on the soil consolidation ability of the root system. As the fissure angle increased, its shear strength increased first and then decreased. When the fissure angle was 60°, its shear strength reached maximum.[Conclusion] The root system can significantly enhance the shear strength of the vegetation concrete substrate and increase the residual shear stress. The distribution of different cracks has different effects on improving the shear strength of the substrate, but the effect of crack distribution on residual shear strength is not obvious.

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李紫娟,夏振尧,张伦,高峰,沈已桐,杨悦舒,肖海,夏栋,许文年.根系及裂隙角度对基材原位剪切特性的影响[J].水土保持通报,2021,41(2):51-57

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  • 收稿日期:2020-09-28
  • 最后修改日期:2020-11-25
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  • 在线发布日期: 2021-05-21
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