Evaluation of Factors Affecting the Shear Strength of Root-Soil Composite of Typical Plants in Wenchuan County

SUN Qingmin; GE Yonggang; CHEN Pan; LIANG Xinyue; DU Yuchen

doi:10.13870/j.cnki.stbcxb.2022.01.009

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Evaluation of Factors Affecting the Shear Strength of Root-Soil Composite of Typical Plants in Wenchuan County

更新时间：2025-03-12

- Evaluation of Factors Affecting the Shear Strength of Root-Soil Composite of Typical Plants in Wenchuan County
- Vol. 36, Issue 1, Pages: 58-65(2022)
- 作者机构：
  
  1. 中国科学院山地灾害与地表过程重点实验室,成都,610041
  2. 中国科学院水利部成都山地灾害与环境研究所,成都,610041
  3. 中国科学院大学,北京,100049
  4. 西藏大学工学院,拉萨,850000
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.01.009
  CLC： S714.7
- Published：2022
- 稿件说明：
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SUN Qingmin, GE Yonggang, CHEN Pan, et al. Evaluation of Factors Affecting the Shear Strength of Root-Soil Composite of Typical Plants in Wenchuan County[J]. 2022, 36(1): 58-65.
DOI：

SUN Qingmin, GE Yonggang, CHEN Pan, et al. Evaluation of Factors Affecting the Shear Strength of Root-Soil Composite of Typical Plants in Wenchuan County[J]. 2022, 36(1): 58-65. DOI： 10.13870/j.cnki.stbcxb.2022.01.009.

摘要

为探究不同植物根-土复合体抗剪强度的差异性及各因素对其的影响程度

选取汶川县针叶林、阔叶林、灌丛、草地4种不同植被覆盖区为研究区

通过野外制取16种优势植物根-土复合体和无根裸土原状试样并开展室内快剪试验。分析了汶川县典型植物根系对土体抗剪强度和抗变形能力的增强作用

运用灰色关联法分析影响复合体抗剪强度的因素。结果表明: (1)16种植物根系均能在一定程度上提高土体抗剪强度和抗变形能力

且主要通过提高土体黏聚力增强其抗剪强度; 根-土复合体黏聚力均大于裸土

其增幅为6.09%~153.27%

不同根系对增强土体黏聚力有明显差异

但内摩擦角变化不显著

且大多略小于裸土; (2)各因素与黏聚力和内摩擦角的灰色关联度均较大

其中黏聚力与干密度的关联度最高(0.803)

根重密度次之(0.793)、塑性指数最低(0.626);内摩擦角与塑性指数、干密度的关联度均较高(0.789

0.700)

Dc最低(0.567)

且根系特征参数对内摩擦角的影响程度不显著。

Abstract

To explore the difference in shear strength of different plant root-soil composites and the influence of various factors on it

four different vegetation coverage areas including coniferous forest

broad-leaved forest

shrub

and grassland in Wenchuan County were selected as the study area. Sixteen dominant plant root-soil composites and unrooted bare soil original samples were prepared in the field

and indoor fast shear experiments were conducted. The enhancement effect of the typical plant roots on the shear strength and deformation resistance of the soil were analyzed. The gray correlation method was used to analyze the degree of influence of the roots and soil related factors on the shear strength of the root-soil composite. The results showed that: (1) The addition of 16 kinds of plant roots could improve the shear strength and deformation resistance of the soil to a certain extent

and the shear strength was mainly enhanced by increasing the cohesion of the soil. The cohesion of the root-soil composite was greater than that of the bare soil by 6.09%~153.27%. Different root systems had obvious differences in enhancing the cohesion of the soil. But the internal friction angle did not change significantly

and most of them were slightly smaller than that of the bare soil. (2) The gray correlation degree of each factor with cohesion and internal friction angle was relatively large

among them

the correlation degree between cohesion and dry density was the highest (0.803)

followed by root weight density (0.793)

and plasticity index was the lowest (0.626). The correlation between internal friction angle and plasticity index and dry density was relatively high (0.789

0.700)

Dc was the lowest (0.567)

and the influence of root characteristic parameters on internal friction angle was not significant.

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