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| 含根率和裂隙率对保留枝茎植株根土复合体剪切特性影响的模拟研究 |
| Simulation of the effect of root content and volumetric fissure rate on the shear behavior of vegetated slope soils |
| 投稿时间：2025-04-26 修订日期：2025-08-03 |
| DOI： |
| 中文关键词: 根土复合体 抗剪强度 干湿循环劣化 体积裂隙率 数值模拟 |
| 英文关键词:Root-soil composite Shear strength Wet-dry cyclic deterioration Volumetric fracture ratio Numerical simulation |
| 基金项目:国家自然科学联合(U2340227,U22A20602) |
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| 中文摘要: |
| 边坡土体在干湿循环下会产生裂缝，在降雨入渗下，雨水会降低坡土的抗剪强度，一般采用植物根系加固坡土且已有大量研究，但在裂隙率和含根率对坡土综合作用机制方面还缺乏足够的成果。为探究含根率和裂隙率对坡土力学特性的综合影响，且考虑到植被护坡直剪试验不能施加法向应力而是切除枝茎只对根土部分做直剪试验，因此本文首先采用室内试验及理论推导确定无根土及根土复合体力学参数，然后利用有限元法数值模拟植被护坡性能的直剪试验，探究坡土在不同法向应力、体积裂隙率和含根率下的剪切特性。试验研究、理论推导计算和数值模拟发现：随着坡土裂隙率升高，坡土抗剪强度变低，随着含根率提高，坡土抗剪强度提高，根系能显著抑制裂隙率的劣化影响，含根率高的根土复合体在水平及竖向观测面上塑性点显著减少，平均剪应力显著增加。 |
| 英文摘要: |
| Cracks are induced on slopes under dry and wet cycles, and rainfall infiltration will reduce the shear strength of slope soils. There have been a number of researches on reinforcing slope soils with plant roots, but there is lack of the combined effect of fissure ratio and root ratio on reinforcement of slope soil. Considering that it is inconvenient to apply normal stresses in the direct shear test of vegetated slopes, and in order to investigate the combined effect of root content and fracture ratio on the mechanical properties of slope soils, indoor wet-dry cyclic deterioration tests and direct shear tests were firstly adopted to determine strength behavior of soil with fissures. Direct shear tests were also adopted for vegetation-root-soil composites to determine strength behavior under different root ratios without normal stress. Then the shear strength parameters of root-soil composites with different fracture ratio and root content ratio were obtained by means of theoretical simplification. Finite element numerical simulation was further conducted to modeling direct shear test on root-soil composites with different volumetric fracture ratio and root content ratio under different normal stress. Results of the experimental study, theoretical calculation and numerical simulation show that the shear strength of slope soil becomes lower with the increase of fracture ratio, and the shear strength of slope soil increases with the increase of root content ratio, and the root system can significantly resist the deterioration effect of fracture ratio. The plastic points on the horizontal shear surface of the root-soil composite with high root content ratio were significantly reduced. |
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